)]}' { "log": [ { "commit": "2a3a4f669df2164288d11406d11d5e4933bf5e53", "tree": "cbcab61ae346f24731b52c706a3650978a95aba3", "parents": [ "35cb5ed01261f5669657d2f1720aca902299887d" ], "author": { "name": "Frédéric Weisbecker", "email": "fweisbec@gmail.com", "time": "Sun Sep 21 20:12:14 2008 +0200" }, "committer": { "name": "Ingo Molnar", "email": "mingo@elte.hu", "time": "Tue Oct 14 10:38:06 2008 +0200" }, "message": "tracing/ftrace: tracing engine depends on Nop Tracer\n\nNow that the nop tracer is used as the default tracer by\nreplacing the \"none\" tracer, tracing engine depends on it.\n\nSigned-off-by: Frederic Weisbecker \u003cfweisbec@gmail.com\u003e\nCc: Steven Rostedt \u003crostedt@goodmis.org\u003e\nCc: Steven Noonan \u003csteven@uplinklabs.net\u003e\nSigned-off-by: Ingo Molnar \u003cmingo@elte.hu\u003e\n" }, { "commit": "fb1b6d8b5154c692172a424e45fbd0573295cb93", "tree": "d9a7ad2c629a6133998402354e77cd721e4962b4", "parents": [ "5bf9a1ee350a10feb94107de32a203d81fbbe706" ], "author": { "name": "Steven Noonan", "email": "steven@uplinklabs.net", "time": "Fri Sep 19 03:06:43 2008 -0700" }, "committer": { "name": "Ingo Molnar", "email": "mingo@elte.hu", "time": "Tue Oct 14 10:37:43 2008 +0200" }, "message": "ftrace: add nop tracer\n\nA no-op tracer which can serve two purposes:\n\n 1. A template for development of a new tracer.\n 2. A convenient way to see ftrace_printk() calls without\n an irrelevant trace making the output messy.\n\n[ mingo@elte.hu: resolved conflicts ]\nSigned-off-by: Steven Noonan \u003csteven@uplinklabs.net\u003e\nSigned-off-by: Ingo Molnar \u003cmingo@elte.hu\u003e\n" }, { "commit": "d3ee6d992821f471193a7ee7a00af9ebb4bf5d01", "tree": "4dbd9712266848c101f249c9df7840ba784b5a31", "parents": [ "80b5e940050c273ba277acbf3a9fbc1d4441e681" ], "author": { "name": "Ingo Molnar", "email": "mingo@elte.hu", "time": "Thu Sep 04 14:04:51 2008 +0200" }, "committer": { "name": "Ingo Molnar", "email": "mingo@elte.hu", "time": "Tue Oct 14 10:36:51 2008 +0200" }, "message": "ftrace: make it depend on DEBUG_KERNEL\n\nmake most of the tracers depend on DEBUG_KERNEL - that\u0027s their intended\npurpose. (most distributions have DEBUG_KERNEL enabled anyway so this is\nnot a practical limitation - but it simplifies the tracing menu in the\nnormal case)\n\nSigned-off-by: Ingo Molnar \u003cmingo@elte.hu\u003e\n" }, { "commit": "2ff01c6a17391225a18256d510b6e5b4aba40aa1", "tree": "9645990cbdcf5009c6b901de1004c3369e44c1aa", "parents": [ "1b6cced6ec9677fa65471e890dfdcb4bf5387643" ], "author": { "name": "Ingo Molnar", "email": "mingo@elte.hu", "time": "Thu Sep 04 15:04:37 2008 +0200" }, "committer": { "name": "Ingo Molnar", "email": "mingo@elte.hu", "time": "Tue Oct 14 10:36:31 2008 +0200" }, "message": "stack tracer: depends on DEBUG_KERNEL\n\nSigned-off-by: Ingo Molnar \u003cmingo@elte.hu\u003e\n" }, { "commit": "e5a81b629ea8feb9e7530cfac35cfb41c45facf3", "tree": "71437955371e0913521d4ddb02db974df9fd8d34", "parents": [ "b3a320417484a6d6b9d28098944df58341353992" ], "author": { "name": "Steven Rostedt", "email": "rostedt@goodmis.org", "time": "Wed Aug 27 23:31:01 2008 -0400" }, "committer": { "name": "Ingo Molnar", "email": "mingo@elte.hu", "time": "Tue Oct 14 10:36:19 2008 +0200" }, "message": "ftrace: add stack tracer\n\nThis is another tracer using the ftrace infrastructure, that examines\nat each function call the size of the stack. If the stack use is greater\nthan the previous max it is recorded.\n\nYou can always see (and set) the max stack size seen. By setting it\nto zero will start the recording again. The backtrace is also available.\n\nFor example:\n\n# cat /debug/tracing/stack_max_size\n1856\n\n# cat /debug/tracing/stack_trace\n[\u003cc027764d\u003e] stack_trace_call+0x8f/0x101\n[\u003cc021b966\u003e] ftrace_call+0x5/0x8\n[\u003cc02553cc\u003e] clocksource_get_next+0x12/0x48\n[\u003cc02542a5\u003e] update_wall_time+0x538/0x6d1\n[\u003cc0245913\u003e] do_timer+0x23/0xb0\n[\u003cc0257657\u003e] tick_do_update_jiffies64+0xd9/0xf1\n[\u003cc02576b9\u003e] tick_sched_timer+0x4a/0xad\n[\u003cc0250fe6\u003e] __run_hrtimer+0x3e/0x75\n[\u003cc02518ed\u003e] hrtimer_interrupt+0xf1/0x154\n[\u003cc022c870\u003e] smp_apic_timer_interrupt+0x71/0x84\n[\u003cc021b7e9\u003e] apic_timer_interrupt+0x2d/0x34\n[\u003cc0238597\u003e] finish_task_switch+0x29/0xa0\n[\u003cc05abd13\u003e] schedule+0x765/0x7be\n[\u003cc05abfca\u003e] schedule_timeout+0x1b/0x90\n[\u003cc05ab4d4\u003e] wait_for_common+0xab/0x101\n[\u003cc05ab5ac\u003e] wait_for_completion+0x12/0x14\n[\u003cc033cfc3\u003e] blk_execute_rq+0x84/0x99\n[\u003cc0402470\u003e] scsi_execute+0xc2/0x105\n[\u003cc040250a\u003e] scsi_execute_req+0x57/0x7f\n[\u003cc043afe0\u003e] sr_test_unit_ready+0x3e/0x97\n[\u003cc043bbd6\u003e] sr_media_change+0x43/0x205\n[\u003cc046b59f\u003e] media_changed+0x48/0x77\n[\u003cc046b5ff\u003e] cdrom_media_changed+0x31/0x37\n[\u003cc043b091\u003e] sr_block_media_changed+0x16/0x18\n[\u003cc02b9e69\u003e] check_disk_change+0x1b/0x63\n[\u003cc046f4c3\u003e] cdrom_open+0x7a1/0x806\n[\u003cc043b148\u003e] sr_block_open+0x78/0x8d\n[\u003cc02ba4c0\u003e] do_open+0x90/0x257\n[\u003cc02ba869\u003e] blkdev_open+0x2d/0x56\n[\u003cc0296a1f\u003e] __dentry_open+0x14d/0x23c\n[\u003cc0296b32\u003e] nameidata_to_filp+0x24/0x38\n[\u003cc02a1c68\u003e] do_filp_open+0x347/0x626\n[\u003cc02967ef\u003e] do_sys_open+0x47/0xbc\n[\u003cc02968b0\u003e] sys_open+0x23/0x2b\n[\u003cc021aadd\u003e] sysenter_do_call+0x12/0x26\n\nI\u0027ve tested this on both x86_64 and i386.\n\nSigned-off-by: Steven Rostedt \u003csrostedt@redhat.com\u003e\nCc: Peter Zijlstra \u003cpeterz@infradead.org\u003e\nCc: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nCc: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\nSigned-off-by: Ingo Molnar \u003cmingo@elte.hu\u003e\n" }, { "commit": "8da3821ba5634497da63d58a69e24a97697c4a2b", "tree": "47d4d097b1cd2aafae2e3596a9ae0d1293228782", "parents": [ "8b1fa1d7b22f386747c7b78b918d4c680c16066f" ], "author": { "name": "Steven Rostedt", "email": "rostedt@goodmis.org", "time": "Thu Aug 14 15:45:07 2008 -0400" }, "committer": { "name": "Ingo Molnar", "email": "mingo@elte.hu", "time": "Tue Oct 14 10:34:40 2008 +0200" }, "message": "ftrace: create __mcount_loc section\n\nThis patch creates a section in the kernel called \"__mcount_loc\".\nThis will hold a list of pointers to the mcount relocation for\neach call site of mcount.\n\nFor example:\n\nobjdump -dr init/main.o\n[...]\nDisassembly of section .text:\n\n0000000000000000 \u003cdo_one_initcall\u003e:\n 0: 55 push %rbp\n[...]\n000000000000017b \u003cinit_post\u003e:\n 17b: 55 push %rbp\n 17c: 48 89 e5 mov %rsp,%rbp\n 17f: 53 push %rbx\n 180: 48 83 ec 08 sub $0x8,%rsp\n 184: e8 00 00 00 00 callq 189 \u003cinit_post+0xe\u003e\n 185: R_X86_64_PC32 mcount+0xfffffffffffffffc\n[...]\n\nWe will add a section to point to each function call.\n\n .section __mcount_loc,\"a\",@progbits\n[...]\n .quad .text + 0x185\n[...]\n\nThe offset to of the mcount call site in init_post is an offset from\nthe start of the section, and not the start of the function init_post.\nThe mcount relocation is at the call site 0x185 from the start of the\n.text section.\n\n .text + 0x185 \u003d\u003d init_post + 0xa\n\nWe need a way to add this __mcount_loc section in a way that we do not\nlose the relocations after final link. The .text section here will\nbe attached to all other .text sections after final link and the\noffsets will be meaningless. We need to keep track of where these\n.text sections are.\n\nTo do this, we use the start of the first function in the section.\ndo_one_initcall. We can make a tmp.s file with this function as a reference\nto the start of the .text section.\n\n .section __mcount_loc,\"a\",@progbits\n[...]\n .quad do_one_initcall + 0x185\n[...]\n\nThen we can compile the tmp.s into a tmp.o\n\n gcc -c tmp.s -o tmp.o\n\nAnd link it into back into main.o.\n\n ld -r main.o tmp.o -o tmp_main.o\n mv tmp_main.o main.o\n\nBut we have a problem. What happens if the first function in a section\nis not exported, and is a static function. The linker will not let\nthe tmp.o use it. This case exists in main.o as well.\n\nDisassembly of section .init.text:\n\n0000000000000000 \u003cset_reset_devices\u003e:\n 0: 55 push %rbp\n 1: 48 89 e5 mov %rsp,%rbp\n 4: e8 00 00 00 00 callq 9 \u003cset_reset_devices+0x9\u003e\n 5: R_X86_64_PC32 mcount+0xfffffffffffffffc\n\nThe first function in .init.text is a static function.\n\n00000000000000a8 t __setup_set_reset_devices\n000000000000105f t __setup_str_set_reset_devices\n0000000000000000 t set_reset_devices\n\nThe lowercase \u0027t\u0027 means that set_reset_devices is local and is not exported.\nIf we simply try to link the tmp.o with the set_reset_devices we end\nup with two symbols: one local and one global.\n\n .section __mcount_loc,\"a\",@progbits\n .quad set_reset_devices + 0x10\n\n00000000000000a8 t __setup_set_reset_devices\n000000000000105f t __setup_str_set_reset_devices\n0000000000000000 t set_reset_devices\n U set_reset_devices\n\nWe still have an undefined reference to set_reset_devices, and if we try\nto compile the kernel, we will end up with an undefined reference to\nset_reset_devices, or even worst, it could be exported someplace else,\nand then we will have a reference to the wrong location.\n\nTo handle this case, we make an intermediate step using objcopy.\nWe convert set_reset_devices into a global exported symbol before linking\nit with tmp.o and set it back afterwards.\n\n00000000000000a8 t __setup_set_reset_devices\n000000000000105f t __setup_str_set_reset_devices\n0000000000000000 T set_reset_devices\n\n00000000000000a8 t __setup_set_reset_devices\n000000000000105f t __setup_str_set_reset_devices\n0000000000000000 T set_reset_devices\n\n00000000000000a8 t __setup_set_reset_devices\n000000000000105f t __setup_str_set_reset_devices\n0000000000000000 t set_reset_devices\n\nNow we have a section in main.o called __mcount_loc that we can place\nsomewhere in the kernel using vmlinux.ld.S and access it to convert\nall these locations that call mcount into nops before starting SMP\nand thus, eliminating the need to do this with kstop_machine.\n\nNote, A well documented perl script (scripts/recordmcount.pl) is used\nto do all this in one location.\n\nSigned-off-by: Steven Rostedt \u003csrostedt@redhat.com\u003e\nSigned-off-by: Ingo Molnar \u003cmingo@elte.hu\u003e\n" }, { "commit": "5f87f1121895dc09d2d1c1db5f14af6aa4ce3e94", "tree": "4b8354ab2dc0890d0d4c91d42ff9e13db50ebeab", "parents": [ "cf569a932217b97e2fc2c48aa597fe29519a0cff" ], "author": { "name": "Ingo Molnar", "email": "mingo@elte.hu", "time": "Wed Jul 23 14:15:22 2008 +0200" }, "committer": { "name": "Ingo Molnar", "email": "mingo@elte.hu", "time": "Tue Oct 14 10:33:32 2008 +0200" }, "message": "tracing: clean up tracepoints kconfig structure\n\ndo not expose users to CONFIG_TRACEPOINTS - tracers can select it\njust fine.\n\nupdate ftrace to select CONFIG_TRACEPOINTS.\n\nSigned-off-by: Ingo Molnar \u003cmingo@elte.hu\u003e\n" }, { "commit": "4d2df795f0c3eb91f97a666f47716121a2f166ed", "tree": "3eec35f76966ff456c6069ddabeb630afbe66a8a", "parents": [ "cf3271a73b612a03da00681ecd9bfefab37c74c9" ], "author": { "name": "Thomas Gleixner", "email": "tglx@linutronix.de", "time": "Sat May 24 15:00:46 2008 +0200" }, "committer": { "name": "Thomas Gleixner", "email": "tglx@linutronix.de", "time": "Sat May 24 15:00:46 2008 +0200" }, "message": "sysprof: make it depend on X86\n\nSigned-off-by: Thomas Gleixner \u003ctglx@linutronix.de\u003e\n" }, { "commit": "5fc4511c756860149b81aead6eca5bdf5c438ea7", "tree": "5d4e2239badd3d43f03155fa4ab1ad7b7e7837b0", "parents": [ "9caee613d3b860ae81b79370eeae9ac967c07536" ], "author": { "name": "Thomas Gleixner", "email": "tglx@linutronix.de", "time": "Fri May 23 23:58:21 2008 +0200" }, "committer": { "name": "Thomas Gleixner", "email": "tglx@linutronix.de", "time": "Fri May 23 23:58:21 2008 +0200" }, "message": "ftrace: make it more available in the Kconfig\n\nSigned-off-by: Thomas Gleixner \u003ctglx@linutronix.de\u003e\n" }, { "commit": "ef4ab15ff34fd9c65e92bee70f58e7179da881c5", "tree": "6d0ed3900e7095aa60f74cc5e0cb54f8efb54c1e", "parents": [ "842af315e8b0adad58fc642eaa5e6f53525e0534" ], "author": { "name": "Ingo Molnar", "email": "mingo@elte.hu", "time": "Mon May 12 21:20:48 2008 +0200" }, "committer": { "name": "Thomas Gleixner", "email": "tglx@linutronix.de", "time": "Fri May 23 23:40:01 2008 +0200" }, "message": "ftrace: make sysprof dependent on x86 for now\n\nthat\u0027s the only tested platform for now. If there\u0027s interest we\ncan make it generic easily.\n\nSigned-off-by: Ingo Molnar \u003cmingo@elte.hu\u003e\nSigned-off-by: Thomas Gleixner \u003ctglx@linutronix.de\u003e\n" }, { "commit": "f06c38103ea9dbca27c3f4d77f444ddefb5477cd", "tree": "9452cf51a1acb2a2019d1680668d051370b08981", "parents": [ "677aa9f77e8de3791b481a0cec6c8b84d1eec626" ], "author": { "name": "Ingo Molnar", "email": "mingo@elte.hu", "time": "Mon May 12 21:20:47 2008 +0200" }, "committer": { "name": "Thomas Gleixner", "email": "tglx@linutronix.de", "time": "Fri May 23 23:39:00 2008 +0200" }, "message": "ftrace: add sysprof plugin\n\nvery first baby version.\n\nSigned-off-by: Ingo Molnar \u003cmingo@elte.hu\u003e\nSigned-off-by: Thomas Gleixner \u003ctglx@linutronix.de\u003e\n" }, { "commit": "677aa9f77e8de3791b481a0cec6c8b84d1eec626", "tree": "4a3cdc6b1653231af31f045dcbaebb806a04d78d", "parents": [ "7fa09f24b477ad41b821713eba757b3aa7a2864a" ], "author": { "name": "Steven Rostedt", "email": "rostedt@goodmis.org", "time": "Sat May 17 00:01:36 2008 -0400" }, "committer": { "name": "Thomas Gleixner", "email": "tglx@linutronix.de", "time": "Fri May 23 22:49:18 2008 +0200" }, "message": "ftrace: add have dynamic ftrace config for archs\n\nNow that ftrace is being ported to other architectures, it has become\napparent that DYNAMIC_FTRACE is dependent on whether or not that\narchitecture implements dynamic ftrace. FTRACE itself may be ported to\nan architecture without porting dynamic ftrace.\n\nThis patch adds HAVE_DYNAMIC_FTRACE to allow architectures to port ftrace\nwithout having to also port the dynamic aspect as well.\n\nSigned-off-by: Steven Rostedt \u003csrostedt@redhat.com\u003e\nSigned-off-by: Ingo Molnar \u003cmingo@elte.hu\u003e\nSigned-off-by: Thomas Gleixner \u003ctglx@linutronix.de\u003e\n" }, { "commit": "c1d2327b36f2261ffa8ff7227321ba900c7eee7f", "tree": "2d09d1fe2e07c097b18c2573bd03189cffa82e71", "parents": [ "1d09daa55d2e9bab7e7d30f0d05e5a7bc60b2a4a" ], "author": { "name": "Ingo Molnar", "email": "mingo@elte.hu", "time": "Mon May 12 21:20:55 2008 +0200" }, "committer": { "name": "Thomas Gleixner", "email": "tglx@linutronix.de", "time": "Fri May 23 21:15:29 2008 +0200" }, "message": "ftrace: restrict tracing to HAVE_FTRACE architectures\n\nSigned-off-by: Ingo Molnar \u003cmingo@elte.hu\u003e\nSigned-off-by: Thomas Gleixner \u003ctglx@linutronix.de\u003e\n" }, { "commit": "694379e9ed4f2f6babe111bf001c69e2e263338b", "tree": "9ce5695c9e650c802b23096d6fe58c0fe626538e", "parents": [ "5429db2d26a59903c81a4f6c6dae7eb9daaea5fc" ], "author": { "name": "Ingo Molnar", "email": "mingo@elte.hu", "time": "Mon May 12 21:20:54 2008 +0200" }, "committer": { "name": "Thomas Gleixner", "email": "tglx@linutronix.de", "time": "Fri May 23 21:12:26 2008 +0200" }, "message": "ftrace: make it more available in the Kconfig\n\nSigned-off-by: Ingo Molnar \u003cmingo@elte.hu\u003e\nSigned-off-by: Thomas Gleixner \u003ctglx@linutronix.de\u003e\n" }, { "commit": "86387f7ee5d3273ff4859e2c64ce656639b6ca65", "tree": "d2080c680e9e9415dfa99bb8408302584035e664", "parents": [ "57422797dc009fc83766bcf230d29dbe6e08e21e" ], "author": { "name": "Ingo Molnar", "email": "mingo@elte.hu", "time": "Mon May 12 21:20:51 2008 +0200" }, "committer": { "name": "Thomas Gleixner", "email": "tglx@linutronix.de", "time": "Fri May 23 21:04:20 2008 +0200" }, "message": "ftrace: add stack tracing\n\nSigned-off-by: Ingo Molnar \u003cmingo@elte.hu\u003e\nSigned-off-by: Thomas Gleixner \u003ctglx@linutronix.de\u003e\n" }, { "commit": "60a11774b38fef1ab90b18c5353bd1c7c4d311c8", "tree": "e2a6fd066b0dba6dcd776d07383e2932055cf66a", "parents": [ "e1c08bdd9fa73e44096e5a82c0d5928b04ab02c8" ], "author": { "name": "Steven Rostedt", "email": "srostedt@redhat.com", "time": "Mon May 12 21:20:44 2008 +0200" }, "committer": { "name": "Thomas Gleixner", "email": "tglx@linutronix.de", "time": "Fri May 23 20:40:36 2008 +0200" }, "message": "ftrace: add self-tests\n\nSigned-off-by: Ingo Molnar \u003cmingo@elte.hu\u003e\nSigned-off-by: Thomas Gleixner \u003ctglx@linutronix.de\u003e\n" }, { "commit": "3d0833953e1b98b79ddf491dd49229eef9baeac1", "tree": "3520cda824bdb58e47ce3e9f43d68249d5cc1a12", "parents": [ "6cd8a4bb2f97527a9ceb30bc77ea4e959c6a95e3" ], "author": { "name": "Steven Rostedt", "email": "srostedt@redhat.com", "time": "Mon May 12 21:20:42 2008 +0200" }, "committer": { "name": "Thomas Gleixner", "email": "tglx@linutronix.de", "time": "Fri May 23 20:33:09 2008 +0200" }, "message": "ftrace: dynamic enabling/disabling of function calls\n\nThis patch adds a feature to dynamically replace the ftrace code\nwith the jmps to allow a kernel with ftrace configured to run\nas fast as it can without it configured.\n\nThe way this works, is on bootup (if ftrace is enabled), a ftrace\nfunction is registered to record the instruction pointer of all\nplaces that call the function.\n\nLater, if there\u0027s still any code to patch, a kthread is awoken\n(rate limited to at most once a second) that performs a stop_machine,\nand replaces all the code that was called with a jmp over the call\nto ftrace. It only replaces what was found the previous time. Typically\nthe system reaches equilibrium quickly after bootup and there\u0027s no code\npatching needed at all.\n\ne.g.\n\n call ftrace /* 5 bytes */\n\nis replaced with\n\n jmp 3f /* jmp is 2 bytes and we jump 3 forward */\n3:\n\nWhen we want to enable ftrace for function tracing, the IP recording\nis removed, and stop_machine is called again to replace all the locations\nof that were recorded back to the call of ftrace. When it is disabled,\nwe replace the code back to the jmp.\n\nAllocation is done by the kthread. If the ftrace recording function is\ncalled, and we don\u0027t have any record slots available, then we simply\nskip that call. Once a second a new page (if needed) is allocated for\nrecording new ftrace function calls. A large batch is allocated at\nboot up to get most of the calls there.\n\nBecause we do this via stop_machine, we don\u0027t have to worry about another\nCPU executing a ftrace call as we modify it. But we do need to worry\nabout NMI\u0027s so all functions that might be called via nmi must be\nannotated with notrace_nmi. When this code is configured in, the NMI code\nwill not call notrace.\n\nSigned-off-by: Steven Rostedt \u003csrostedt@redhat.com\u003e\nSigned-off-by: Ingo Molnar \u003cmingo@elte.hu\u003e\nSigned-off-by: Thomas Gleixner \u003ctglx@linutronix.de\u003e\n" }, { "commit": "6cd8a4bb2f97527a9ceb30bc77ea4e959c6a95e3", "tree": "845af8f3c7f8956b4f3591759a0d67248af243a2", "parents": [ "81d68a96a39844853b37f20cc8282d9b65b78ef3" ], "author": { "name": "Steven Rostedt", "email": "srostedt@redhat.com", "time": "Mon May 12 21:20:42 2008 +0200" }, "committer": { "name": "Thomas Gleixner", "email": "tglx@linutronix.de", "time": "Fri May 23 20:32:54 2008 +0200" }, "message": "ftrace: trace preempt off critical timings\n\nAdd preempt off timings. A lot of kernel core code is taken from the RT patch\nlatency trace that was written by Ingo Molnar.\n\nThis adds \"preemptoff\" and \"preemptirqsoff\" to /debugfs/tracing/available_tracers\n\nNow instead of just tracing irqs off, preemption off can be selected\nto be recorded.\n\nWhen this is selected, it shares the same files as irqs off timings.\nOne can either trace preemption off, irqs off, or one or the other off.\n\nBy echoing \"preemptoff\" into /debugfs/tracing/current_tracer, recording\nof preempt off only is performed. \"irqsoff\" will only record the time\nirqs are disabled, but \"preemptirqsoff\" will take the total time irqs\nor preemption are disabled. Runtime switching of these options is now\nsupported by simpling echoing in the appropriate trace name into\n/debugfs/tracing/current_tracer.\n\nSigned-off-by: Steven Rostedt \u003csrostedt@redhat.com\u003e\nSigned-off-by: Ingo Molnar \u003cmingo@elte.hu\u003e\nSigned-off-by: Thomas Gleixner \u003ctglx@linutronix.de\u003e\n" }, { "commit": "81d68a96a39844853b37f20cc8282d9b65b78ef3", "tree": "bbc05f415930c15fb5a1004620bd77585fcec43a", "parents": [ "352ad25aa4a189c667cb2af333948d34692a2d27" ], "author": { "name": "Steven Rostedt", "email": "srostedt@redhat.com", "time": "Mon May 12 21:20:42 2008 +0200" }, "committer": { "name": "Thomas Gleixner", "email": "tglx@linutronix.de", "time": "Fri May 23 20:32:46 2008 +0200" }, "message": "ftrace: trace irq disabled critical timings\n\nThis patch adds latency tracing for critical timings\n(how long interrupts are disabled for).\n\n \"irqsoff\" is added to /debugfs/tracing/available_tracers\n\nNote:\n tracing_max_latency\n also holds the max latency for irqsoff (in usecs).\n (default to large number so one must start latency tracing)\n\n tracing_thresh\n threshold (in usecs) to always print out if irqs off\n is detected to be longer than stated here.\n If irq_thresh is non-zero, then max_irq_latency\n is ignored.\n\nHere\u0027s an example of a trace with ftrace_enabled \u003d 0\n\n\u003d\u003d\u003d\u003d\u003d\u003d\u003d\npreemption latency trace v1.1.5 on 2.6.24-rc7\nSigned-off-by: Ingo Molnar \u003cmingo@elte.hu\u003e\n--------------------------------------------------------------------\n latency: 100 us, #3/3, CPU#1 | (M:rt VP:0, KP:0, SP:0 HP:0 #P:2)\n -----------------\n | task: swapper-0 (uid:0 nice:0 policy:0 rt_prio:0)\n -----------------\n \u003d\u003e started at: _spin_lock_irqsave+0x2a/0xb7\n \u003d\u003e ended at: _spin_unlock_irqrestore+0x32/0x5f\n\n _------\u003d\u003e CPU#\n / _-----\u003d\u003e irqs-off\n | / _----\u003d\u003e need-resched\n || / _---\u003d\u003e hardirq/softirq\n ||| / _--\u003d\u003e preempt-depth\n |||| /\n ||||| delay\n cmd pid ||||| time | caller\n \\ / ||||| \\ | /\n swapper-0 1d.s3 0us+: _spin_lock_irqsave+0x2a/0xb7 (e1000_update_stats+0x47/0x64c [e1000])\n swapper-0 1d.s3 100us : _spin_unlock_irqrestore+0x32/0x5f (e1000_update_stats+0x641/0x64c [e1000])\n swapper-0 1d.s3 100us : trace_hardirqs_on_caller+0x75/0x89 (_spin_unlock_irqrestore+0x32/0x5f)\n\nvim:ft\u003dhelp\n\u003d\u003d\u003d\u003d\u003d\u003d\u003d\n\nAnd this is a trace with ftrace_enabled \u003d\u003d 1\n\n\u003d\u003d\u003d\u003d\u003d\u003d\u003d\npreemption latency trace v1.1.5 on 2.6.24-rc7\n--------------------------------------------------------------------\n latency: 102 us, #12/12, CPU#1 | (M:rt VP:0, KP:0, SP:0 HP:0 #P:2)\n -----------------\n | task: swapper-0 (uid:0 nice:0 policy:0 rt_prio:0)\n -----------------\n \u003d\u003e started at: _spin_lock_irqsave+0x2a/0xb7\n \u003d\u003e ended at: _spin_unlock_irqrestore+0x32/0x5f\n\n _------\u003d\u003e CPU#\n / _-----\u003d\u003e irqs-off\n | / _----\u003d\u003e need-resched\n || / _---\u003d\u003e hardirq/softirq\n ||| / _--\u003d\u003e preempt-depth\n |||| /\n ||||| delay\n cmd pid ||||| time | caller\n \\ / ||||| \\ | /\n swapper-0 1dNs3 0us+: _spin_lock_irqsave+0x2a/0xb7 (e1000_update_stats+0x47/0x64c [e1000])\n swapper-0 1dNs3 46us : e1000_read_phy_reg+0x16/0x225 [e1000] (e1000_update_stats+0x5e2/0x64c [e1000])\n swapper-0 1dNs3 46us : e1000_swfw_sync_acquire+0x10/0x99 [e1000] (e1000_read_phy_reg+0x49/0x225 [e1000])\n swapper-0 1dNs3 46us : e1000_get_hw_eeprom_semaphore+0x12/0xa6 [e1000] (e1000_swfw_sync_acquire+0x36/0x99 [e1000])\n swapper-0 1dNs3 47us : __const_udelay+0x9/0x47 (e1000_read_phy_reg+0x116/0x225 [e1000])\n swapper-0 1dNs3 47us+: __delay+0x9/0x50 (__const_udelay+0x45/0x47)\n swapper-0 1dNs3 97us : preempt_schedule+0xc/0x84 (__delay+0x4e/0x50)\n swapper-0 1dNs3 98us : e1000_swfw_sync_release+0xc/0x55 [e1000] (e1000_read_phy_reg+0x211/0x225 [e1000])\n swapper-0 1dNs3 99us+: e1000_put_hw_eeprom_semaphore+0x9/0x35 [e1000] (e1000_swfw_sync_release+0x50/0x55 [e1000])\n swapper-0 1dNs3 101us : _spin_unlock_irqrestore+0xe/0x5f (e1000_update_stats+0x641/0x64c [e1000])\n swapper-0 1dNs3 102us : _spin_unlock_irqrestore+0x32/0x5f (e1000_update_stats+0x641/0x64c [e1000])\n swapper-0 1dNs3 102us : trace_hardirqs_on_caller+0x75/0x89 (_spin_unlock_irqrestore+0x32/0x5f)\n\nvim:ft\u003dhelp\n\u003d\u003d\u003d\u003d\u003d\u003d\u003d\n\nSigned-off-by: Steven Rostedt \u003csrostedt@redhat.com\u003e\nSigned-off-by: Ingo Molnar \u003cmingo@elte.hu\u003e\nSigned-off-by: Thomas Gleixner \u003ctglx@linutronix.de\u003e\n" }, { "commit": "352ad25aa4a189c667cb2af333948d34692a2d27", "tree": "83a11c626b3818711d3b88061964c9ea603f7b68", "parents": [ "35e8e302e5d6e32675df2fc1dd3a53dfa6630dc1" ], "author": { "name": "Steven Rostedt", "email": "srostedt@redhat.com", "time": "Mon May 12 21:20:42 2008 +0200" }, "committer": { "name": "Thomas Gleixner", "email": "tglx@linutronix.de", "time": "Fri May 23 20:32:36 2008 +0200" }, "message": "ftrace: tracer for scheduler wakeup latency\n\nThis patch adds the tracer that tracks the wakeup latency of the\nhighest priority waking task.\n\n \"wakeup\" is added to /debugfs/tracing/available_tracers\n\nAlso added to /debugfs/tracing\n\n tracing_max_latency\n holds the current max latency for the wakeup\n\n wakeup_thresh\n if set to other than zero, a log will be recorded\n for every wakeup that takes longer than the number\n entered in here (usecs for all counters)\n (deletes previous trace)\n\nExamples:\n\n (with ftrace_enabled \u003d 0)\n\n\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\npreemption latency trace v1.1.5 on 2.6.24-rc8\nSigned-off-by: Ingo Molnar \u003cmingo@elte.hu\u003e\n--------------------------------------------------------------------\n latency: 26 us, #2/2, CPU#1 | (M:rt VP:0, KP:0, SP:0 HP:0 #P:2)\n -----------------\n | task: migration/0-3 (uid:0 nice:-5 policy:1 rt_prio:99)\n -----------------\n\n _------\u003d\u003e CPU#\n / _-----\u003d\u003e irqs-off\n | / _----\u003d\u003e need-resched\n || / _---\u003d\u003e hardirq/softirq\n ||| / _--\u003d\u003e preempt-depth\n |||| /\n ||||| delay\n cmd pid ||||| time | caller\n \\ / ||||| \\ | /\n quilt-8551 0d..3 0us+: wake_up_process+0x15/0x17 \u003cffffffff80233e80\u003e (sched_exec+0xc9/0x100 \u003cffffffff80235343\u003e)\n quilt-8551 0d..4 26us : sched_switch_callback+0x73/0x81 \u003cffffffff80338d2f\u003e (schedule+0x483/0x6d5 \u003cffffffff8048b3ee\u003e)\n\nvim:ft\u003dhelp\n\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\n\n (with ftrace_enabled \u003d 1)\n\n\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\npreemption latency trace v1.1.5 on 2.6.24-rc8\n--------------------------------------------------------------------\n latency: 36 us, #45/45, CPU#0 | (M:rt VP:0, KP:0, SP:0 HP:0 #P:2)\n -----------------\n | task: migration/1-5 (uid:0 nice:-5 policy:1 rt_prio:99)\n -----------------\n\n _------\u003d\u003e CPU#\n / _-----\u003d\u003e irqs-off\n | / _----\u003d\u003e need-resched\n || / _---\u003d\u003e hardirq/softirq\n ||| / _--\u003d\u003e preempt-depth\n |||| /\n ||||| delay\n cmd pid ||||| time | caller\n \\ / ||||| \\ | /\n bash-10653 1d..3 0us : wake_up_process+0x15/0x17 \u003cffffffff80233e80\u003e (sched_exec+0xc9/0x100 \u003cffffffff80235343\u003e)\n bash-10653 1d..3 1us : try_to_wake_up+0x271/0x2e7 \u003cffffffff80233dcf\u003e (sub_preempt_count+0xc/0x7a \u003cffffffff8023309e\u003e)\n bash-10653 1d..2 2us : try_to_wake_up+0x296/0x2e7 \u003cffffffff80233df4\u003e (update_rq_clock+0x9/0x20 \u003cffffffff802303f3\u003e)\n bash-10653 1d..2 2us : update_rq_clock+0x1e/0x20 \u003cffffffff80230408\u003e (__update_rq_clock+0xc/0x90 \u003cffffffff80230366\u003e)\n bash-10653 1d..2 3us : __update_rq_clock+0x1b/0x90 \u003cffffffff80230375\u003e (sched_clock+0x9/0x29 \u003cffffffff80214529\u003e)\n bash-10653 1d..2 4us : try_to_wake_up+0x2a6/0x2e7 \u003cffffffff80233e04\u003e (activate_task+0xc/0x3f \u003cffffffff8022ffca\u003e)\n bash-10653 1d..2 4us : activate_task+0x2d/0x3f \u003cffffffff8022ffeb\u003e (enqueue_task+0xe/0x66 \u003cffffffff8022ff66\u003e)\n bash-10653 1d..2 5us : enqueue_task+0x5b/0x66 \u003cffffffff8022ffb3\u003e (enqueue_task_rt+0x9/0x3c \u003cffffffff80233351\u003e)\n bash-10653 1d..2 6us : try_to_wake_up+0x2ba/0x2e7 \u003cffffffff80233e18\u003e (check_preempt_wakeup+0x12/0x99 \u003cffffffff80234f84\u003e)\n[...]\n bash-10653 1d..5 33us : tracing_record_cmdline+0xcf/0xd4 \u003cffffffff80338aad\u003e (_spin_unlock+0x9/0x33 \u003cffffffff8048d3ec\u003e)\n bash-10653 1d..5 34us : _spin_unlock+0x19/0x33 \u003cffffffff8048d3fc\u003e (sub_preempt_count+0xc/0x7a \u003cffffffff8023309e\u003e)\n bash-10653 1d..4 35us : wakeup_sched_switch+0x65/0x2ff \u003cffffffff80339f66\u003e (_spin_lock_irqsave+0xc/0xa9 \u003cffffffff8048d08b\u003e)\n bash-10653 1d..4 35us : _spin_lock_irqsave+0x19/0xa9 \u003cffffffff8048d098\u003e (add_preempt_count+0xe/0x77 \u003cffffffff8023311a\u003e)\n bash-10653 1d..4 36us : sched_switch_callback+0x73/0x81 \u003cffffffff80338d2f\u003e (schedule+0x483/0x6d5 \u003cffffffff8048b3ee\u003e)\n\nvim:ft\u003dhelp\n\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\n\nThe [...] was added here to not waste your email box space.\n\nSigned-off-by: Steven Rostedt \u003csrostedt@redhat.com\u003e\nSigned-off-by: Ingo Molnar \u003cmingo@elte.hu\u003e\nSigned-off-by: Thomas Gleixner \u003ctglx@linutronix.de\u003e\n" }, { "commit": "35e8e302e5d6e32675df2fc1dd3a53dfa6630dc1", "tree": "5b5b503666d882bbb4d805b7b20b4f3b11d2c40e", "parents": [ "1b29b01887e6032dcaf818c14999c7a39593b4e7" ], "author": { "name": "Steven Rostedt", "email": "srostedt@redhat.com", "time": "Mon May 12 21:20:42 2008 +0200" }, "committer": { "name": "Thomas Gleixner", "email": "tglx@linutronix.de", "time": "Fri May 23 20:32:27 2008 +0200" }, "message": "ftrace: add tracing of context switches\n\nThis patch adds context switch tracing, of the format of:\n\n _------\u003d\u003e CPU#\n / _-----\u003d\u003e irqs-off\n | / _----\u003d\u003e need-resched\n || / _---\u003d\u003e hardirq/softirq\n ||| / _--\u003d\u003e preempt-depth\n |||| /\n ||||| delay\n cmd pid ||||| time | pid:prio:state\n \\ / ||||| \\ | /\n swapper-0 1d..3 137us+: 0:140:R --\u003e 2912:120\n sshd-2912 1d..3 216us+: 2912:120:S --\u003e 0:140\n swapper-0 1d..3 261us+: 0:140:R --\u003e 2912:120\n bash-2920 0d..3 267us+: 2920:120:S --\u003e 0:140\n sshd-2912 1d..3 330us!: 2912:120:S --\u003e 0:140\n swapper-0 1d..3 2389us+: 0:140:R --\u003e 2847:120\n yum-upda-2847 1d..3 2411us!: 2847:120:S --\u003e 0:140\n swapper-0 0d..3 11089us+: 0:140:R --\u003e 3139:120\n gdm-bina-3139 0d..3 11113us!: 3139:120:S --\u003e 0:140\n swapper-0 1d..3 102328us+: 0:140:R --\u003e 2847:120\n yum-upda-2847 1d..3 102348us!: 2847:120:S --\u003e 0:140\n\n \"sched_switch\" is added to /debugfs/tracing/available_tracers\n\n[ Eugene Teo \u003ceugeneteo@kernel.sg: remove unused tracing_sched_switch_enabled ]\n\nSigned-off-by: Steven Rostedt \u003csrostedt@redhat.com\u003e\nCc: Mathieu Desnoyers \u003cmathieu.desnoyers@polymtl.ca\u003e\nSigned-off-by: Ingo Molnar \u003cmingo@elte.hu\u003e\nSigned-off-by: Thomas Gleixner \u003ctglx@linutronix.de\u003e\n" }, { "commit": "1b29b01887e6032dcaf818c14999c7a39593b4e7", "tree": "6bcef64d5a7822b0f259a52b852af8cade6b3468", "parents": [ "bc0c38d139ec7fcd5c030aea16b008f3732e42ac" ], "author": { "name": "Steven Rostedt", "email": "srostedt@redhat.com", "time": "Mon May 12 21:20:42 2008 +0200" }, "committer": { "name": "Thomas Gleixner", "email": "tglx@linutronix.de", "time": "Fri May 23 20:32:13 2008 +0200" }, "message": "ftrace: function tracer\n\nThis is a simple trace that uses the ftrace infrastructure. It is\ndesigned to be fast and small, and easy to use. It is useful to\nrecord things that happen over a very short period of time, and\nnot to analyze the system in general.\n\n Updates:\n\n available_tracers\n \"function\" is added to this file.\n\n current_tracer\n To enable the function tracer:\n\n echo function \u003e /debugfs/tracing/current_tracer\n\n To disable the tracer:\n\n echo disable \u003e /debugfs/tracing/current_tracer\n\nThe output of the function_trace file is as follows\n\n \"echo noverbose \u003e /debugfs/tracing/iter_ctrl\"\n\npreemption latency trace v1.1.5 on 2.6.24-rc7-tst\nSigned-off-by: Ingo Molnar \u003cmingo@elte.hu\u003e\n--------------------------------------------------------------------\n latency: 0 us, #419428/4361791, CPU#1 | (M:desktop VP:0, KP:0, SP:0 HP:0 #P:4)\n -----------------\n | task: -0 (uid:0 nice:0 policy:0 rt_prio:0)\n -----------------\n\n _------\u003d\u003e CPU#\n / _-----\u003d\u003e irqs-off\n | / _----\u003d\u003e need-resched\n || / _---\u003d\u003e hardirq/softirq\n ||| / _--\u003d\u003e preempt-depth\n |||| /\n ||||| delay\n cmd pid ||||| time | caller\n \\ / ||||| \\ | /\n swapper-0 0d.h. 1595128us+: set_normalized_timespec+0x8/0x2d \u003cc043841d\u003e (ktime_get_ts+0x4a/0x4e \u003cc04499d4\u003e)\n swapper-0 0d.h. 1595131us+: _spin_lock+0x8/0x18 \u003cc0630690\u003e (hrtimer_interrupt+0x6e/0x1b0 \u003cc0449c56\u003e)\n\nOr with verbose turned on:\n\n \"echo verbose \u003e /debugfs/tracing/iter_ctrl\"\n\npreemption latency trace v1.1.5 on 2.6.24-rc7-tst\n--------------------------------------------------------------------\n latency: 0 us, #419428/4361791, CPU#1 | (M:desktop VP:0, KP:0, SP:0 HP:0 #P:4)\n -----------------\n | task: -0 (uid:0 nice:0 policy:0 rt_prio:0)\n -----------------\n\n swapper 0 0 9 00000000 00000000 [f3675f41] 1595.128ms (+0.003ms): set_normalized_timespec+0x8/0x2d \u003cc043841d\u003e (ktime_get_ts+0x4a/0x4e \u003cc04499d4\u003e)\n swapper 0 0 9 00000000 00000001 [f3675f45] 1595.131ms (+0.003ms): _spin_lock+0x8/0x18 \u003cc0630690\u003e (hrtimer_interrupt+0x6e/0x1b0 \u003cc0449c56\u003e)\n swapper 0 0 9 00000000 00000002 [f3675f48] 1595.135ms (+0.003ms): _spin_lock+0x8/0x18 \u003cc0630690\u003e (hrtimer_interrupt+0x6e/0x1b0 \u003cc0449c56\u003e)\n\nThe \"trace\" file is not affected by the verbose mode, but is by the symonly.\n\n echo \"nosymonly\" \u003e /debugfs/tracing/iter_ctrl\n\ntracer:\n[ 81.479967] CPU 0: bash:3154 register_ftrace_function+0x5f/0x66 \u003cffffffff80337a4d\u003e \u003c-- _spin_unlock_irqrestore+0xe/0x5a \u003cffffffff8048cc8f\u003e\n[ 81.479967] CPU 0: bash:3154 _spin_unlock_irqrestore+0x3e/0x5a \u003cffffffff8048ccbf\u003e \u003c-- sub_preempt_count+0xc/0x7a \u003cffffffff80233d7b\u003e\n[ 81.479968] CPU 0: bash:3154 sub_preempt_count+0x30/0x7a \u003cffffffff80233d9f\u003e \u003c-- in_lock_functions+0x9/0x24 \u003cffffffff8025a75d\u003e\n[ 81.479968] CPU 0: bash:3154 vfs_write+0x11d/0x155 \u003cffffffff8029a043\u003e \u003c-- dnotify_parent+0x12/0x78 \u003cffffffff802d54fb\u003e\n[ 81.479968] CPU 0: bash:3154 dnotify_parent+0x2d/0x78 \u003cffffffff802d5516\u003e \u003c-- _spin_lock+0xe/0x70 \u003cffffffff8048c910\u003e\n[ 81.479969] CPU 0: bash:3154 _spin_lock+0x1b/0x70 \u003cffffffff8048c91d\u003e \u003c-- add_preempt_count+0xe/0x77 \u003cffffffff80233df7\u003e\n[ 81.479969] CPU 0: bash:3154 add_preempt_count+0x3e/0x77 \u003cffffffff80233e27\u003e \u003c-- in_lock_functions+0x9/0x24 \u003cffffffff8025a75d\u003e\n\n echo \"symonly\" \u003e /debugfs/tracing/iter_ctrl\n\ntracer:\n[ 81.479913] CPU 0: bash:3154 register_ftrace_function+0x5f/0x66 \u003c-- _spin_unlock_irqrestore+0xe/0x5a\n[ 81.479913] CPU 0: bash:3154 _spin_unlock_irqrestore+0x3e/0x5a \u003c-- sub_preempt_count+0xc/0x7a\n[ 81.479913] CPU 0: bash:3154 sub_preempt_count+0x30/0x7a \u003c-- in_lock_functions+0x9/0x24\n[ 81.479914] CPU 0: bash:3154 vfs_write+0x11d/0x155 \u003c-- dnotify_parent+0x12/0x78\n[ 81.479914] CPU 0: bash:3154 dnotify_parent+0x2d/0x78 \u003c-- _spin_lock+0xe/0x70\n[ 81.479914] CPU 0: bash:3154 _spin_lock+0x1b/0x70 \u003c-- add_preempt_count+0xe/0x77\n[ 81.479914] CPU 0: bash:3154 add_preempt_count+0x3e/0x77 \u003c-- in_lock_functions+0x9/0x24\n\nSigned-off-by: Steven Rostedt \u003csrostedt@redhat.com\u003e\nSigned-off-by: Arnaldo Carvalho de Melo \u003cacme@ghostprotocols.net\u003e\nSigned-off-by: Ingo Molnar \u003cmingo@elte.hu\u003e\nSigned-off-by: Thomas Gleixner \u003ctglx@linutronix.de\u003e\n" }, { "commit": "bc0c38d139ec7fcd5c030aea16b008f3732e42ac", "tree": "adaaf5e2ca49bbd7025bc357f87df9cb47641022", "parents": [ "16444a8a40d4c7b4f6de34af0cae1f76a4f6c901" ], "author": { "name": "Steven Rostedt", "email": "srostedt@redhat.com", "time": "Mon May 12 21:20:42 2008 +0200" }, "committer": { "name": "Thomas Gleixner", "email": "tglx@linutronix.de", "time": "Fri May 23 20:32:06 2008 +0200" }, "message": "ftrace: latency tracer infrastructure\n\nThis patch adds the latency tracer infrastructure. This patch\ndoes not add anything that will select and turn it on, but will\nbe used by later patches.\n\nIf it were to be compiled, it would add the following files\nto the debugfs:\n\n The root tracing directory:\n\n /debugfs/tracing/\n\nThis patch also adds the following files:\n\n available_tracers\n list of available tracers. Currently no tracers are\n available. Looking into this file only shows\n \"none\" which is used to unregister all tracers.\n\n current_tracer\n The trace that is currently active. Empty on start up.\n To switch to a tracer simply echo one of the tracers that\n are listed in available_tracers:\n\n example: (used with later patches)\n\n echo function \u003e /debugfs/tracing/current_tracer\n\n To disable the tracer:\n\n echo disable \u003e /debugfs/tracing/current_tracer\n\n tracing_enabled\n echoing \"1\" into this file starts the ftrace function tracing\n (if sysctl kernel.ftrace_enabled\u003d1)\n echoing \"0\" turns it off.\n\n latency_trace\n This file is readonly and holds the result of the trace.\n\n trace\n This file outputs a easier to read version of the trace.\n\n iter_ctrl\n Controls the way the output of traces look.\n So far there\u0027s two controls:\n echoing in \"symonly\" will only show the kallsyms variables\n without the addresses (if kallsyms was configured)\n echoing in \"verbose\" will change the output to show\n a lot more data, but not very easy to understand by\n humans.\n echoing in \"nosymonly\" turns off symonly.\n echoing in \"noverbose\" turns off verbose.\n\nSigned-off-by: Steven Rostedt \u003csrostedt@redhat.com\u003e\nSigned-off-by: Arnaldo Carvalho de Melo \u003cacme@ghostprotocols.net\u003e\nSigned-off-by: Ingo Molnar \u003cmingo@elte.hu\u003e\nSigned-off-by: Thomas Gleixner \u003ctglx@linutronix.de\u003e\n" }, { "commit": "16444a8a40d4c7b4f6de34af0cae1f76a4f6c901", "tree": "9c290bcdbdc1ecf8f578c30b3b36914e14fdaacc", "parents": [ "6e766410c4babd37bc7cd5e25009c179781742c8" ], "author": { "name": "Arnaldo Carvalho de Melo", "email": "acme@ghostprotocols.net", "time": "Mon May 12 21:20:42 2008 +0200" }, "committer": { "name": "Thomas Gleixner", "email": "tglx@linutronix.de", "time": "Fri May 23 20:31:58 2008 +0200" }, "message": "ftrace: add basic support for gcc profiler instrumentation\n\nIf CONFIG_FTRACE is selected and /proc/sys/kernel/ftrace_enabled is\nset to a non-zero value the ftrace routine will be called everytime\nwe enter a kernel function that is not marked with the \"notrace\"\nattribute.\n\nThe ftrace routine will then call a registered function if a function\nhappens to be registered.\n\n[ This code has been highly hacked by Steven Rostedt and Ingo Molnar,\n so don\u0027t blame Arnaldo for all of this ;-) ]\n\nUpdate:\n It is now possible to register more than one ftrace function.\n If only one ftrace function is registered, that will be the\n function that ftrace calls directly. If more than one function\n is registered, then ftrace will call a function that will loop\n through the functions to call.\n\nSigned-off-by: Arnaldo Carvalho de Melo \u003cacme@ghostprotocols.net\u003e\nSigned-off-by: Steven Rostedt \u003csrostedt@redhat.com\u003e\nSigned-off-by: Ingo Molnar \u003cmingo@elte.hu\u003e\nSigned-off-by: Thomas Gleixner \u003ctglx@linutronix.de\u003e\n" } ] }