)]}' { "log": [ { "commit": "8e3e076c5a78519a9f64cd384e8f18bc21882ce0", "tree": "f032258fde3aa4771e86bf4552fe4530c221dec3", "parents": [ "00b41ec2611dc98f87f30753ee00a53db648d662" ], "author": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Sat May 10 20:58:02 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Sat May 10 20:58:02 2008 -0700" }, "message": "BKL: revert back to the old spinlock implementation\n\nThe generic semaphore rewrite had a huge performance regression on AIM7\n(and potentially other BKL-heavy benchmarks) because the generic\nsemaphores had been rewritten to be simple to understand and fair. The\nlatter, in particular, turns a semaphore-based BKL implementation into a\nmess of scheduling.\n\nThe attempt to fix the performance regression failed miserably (see the\nprevious commit 00b41ec2611dc98f87f30753ee00a53db648d662 \u0027Revert\n\"semaphore: fix\"\u0027), and so for now the simple and sane approach is to\ninstead just go back to the old spinlock-based BKL implementation that\nnever had any issues like this.\n\nThis patch also has the advantage of being reported to fix the\nregression completely according to Yanmin Zhang, unlike the semaphore\nhack which still left a couple percentage point regression.\n\nAs a spinlock, the BKL obviously has the potential to be a latency\nissue, but it\u0027s not really any different from any other spinlock in that\nrespect. We do want to get rid of the BKL asap, but that has been the\nplan for several years.\n\nThese days, the biggest users are in the tty layer (open/release in\nparticular) and Alan holds out some hope:\n\n \"tty release is probably a few months away from getting cured - I\u0027m\n afraid it will almost certainly be the very last user of the BKL in\n tty to get fixed as it depends on everything else being sanely locked.\"\n\nso while we\u0027re not there yet, we do have a plan of action.\n\nTested-by: Yanmin Zhang \u003cyanmin_zhang@linux.intel.com\u003e\nCc: Ingo Molnar \u003cmingo@elte.hu\u003e\nCc: Andi Kleen \u003candi@firstfloor.org\u003e\nCc: Matthew Wilcox \u003cmatthew@wil.cx\u003e\nCc: Alexander Viro \u003cviro@ftp.linux.org.uk\u003e\nCc: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "6188e10d38b8d7244ee7776d5f1f88c837b4b93f", "tree": "6675e02c47fb684a613e10513816b5dcc5de28a9", "parents": [ "d7b1acd3b524b39f418e463e836b48ac041954d6" ], "author": { "name": "Matthew Wilcox", "email": "matthew@wil.cx", "time": "Fri Apr 18 22:21:05 2008 -0400" }, "committer": { "name": "Matthew Wilcox", "email": "willy@linux.intel.com", "time": "Fri Apr 18 22:22:54 2008 -0400" }, "message": "Convert asm/semaphore.h users to linux/semaphore.h\n\nSigned-off-by: Matthew Wilcox \u003cwilly@linux.intel.com\u003e\n" }, { "commit": "e48b3deee475134585eed03e7afebe4bf9e0dba9", "tree": "8a026147f9f50baf8cf15c79b84e502ab769088b", "parents": [ "8b91de2e58318d1168bc13d164478c1a7217a63a" ], "author": { "name": "Matthew Wilcox", "email": "matthew@wil.cx", "time": "Tue Feb 26 18:34:25 2008 -0500" }, "committer": { "name": "Matthew Wilcox", "email": "willy@linux.intel.com", "time": "Thu Apr 17 10:42:27 2008 -0400" }, "message": "Add semaphore.h to kernel_lock.c\n\nkernel_lock.c uses DECLARE_MUTEX, up() and down() without explicitly\nincluding asm/semaphore.h. This is fragile and leaves it vulnerable\nto breakage during header reorganisations.\n\nSigned-off-by: Matthew Wilcox \u003cwilly@linux.intel.com\u003e\n" }, { "commit": "6478d8800b75253b2a934ddcb734e13ade023ad0", "tree": "df4017269b8755735578445c0a8a9e8b3b2615e9", "parents": [ "58b8a73ab8becfcaea84abc2a06038281efa4c8a" ], "author": { "name": "Ingo Molnar", "email": "mingo@elte.hu", "time": "Fri Jan 25 21:08:33 2008 +0100" }, "committer": { "name": "Ingo Molnar", "email": "mingo@elte.hu", "time": "Fri Jan 25 21:08:33 2008 +0100" }, "message": "sched: remove the !PREEMPT_BKL code\n\nremove the !PREEMPT_BKL code.\n\nthis removes 160 lines of legacy code.\n\nSigned-off-by: Ingo Molnar \u003cmingo@elte.hu\u003e\n" }, { "commit": "5895df967dac8b12c8ed254f5cc4d46f50e88876", "tree": "bfea87d2aee60858ccc14a533667ff6788ce0791", "parents": [ "211fee8a82893062f45a7f2e4e50b245bc577c0c" ], "author": { "name": "Simon Arlott", "email": "simon@fire.lp0.eu", "time": "Sat Oct 20 01:29:18 2007 +0200" }, "committer": { "name": "Adrian Bunk", "email": "bunk@kernel.org", "time": "Sat Oct 20 01:29:18 2007 +0200" }, "message": "spelling fixes: lib/\n\nSpelling fix in lib/.\n\nSigned-off-by: Simon Arlott \u003csimon@fire.lp0.eu\u003e\nSigned-off-by: Adrian Bunk \u003cbunk@kernel.org\u003e\n" }, { "commit": "8a25d5debff2daee280e83e09d8c25d67c26a972", "tree": "3bccfef9acb66fc62863bfd6c16493c5e8c8e394", "parents": [ "4ea2176dfa714882e88180b474e4cbcd888b70af" ], "author": { "name": "Ingo Molnar", "email": "mingo@elte.hu", "time": "Mon Jul 03 00:24:54 2006 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@g5.osdl.org", "time": "Mon Jul 03 15:27:04 2006 -0700" }, "message": "[PATCH] lockdep: prove spinlock rwlock locking correctness\n\nUse the lock validator framework to prove spinlock and rwlock locking\ncorrectness.\n\nSigned-off-by: Ingo Molnar \u003cmingo@elte.hu\u003e\nSigned-off-by: Arjan van de Ven \u003carjan@linux.intel.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@osdl.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n" }, { "commit": "d6e05edc59ecd79e8badf440c0d295a979bdfa3e", "tree": "50362161f69317242ab603c51a18a818a4c93285", "parents": [ "f18190bd3407554ba6df30a1927e07e6cba93e56" ], "author": { "name": "Andreas Mohr", "email": "andi@lisas.de", "time": "Mon Jun 26 18:35:02 2006 +0200" }, "committer": { "name": "Adrian Bunk", "email": "bunk@stusta.de", "time": "Mon Jun 26 18:35:02 2006 +0200" }, "message": "spelling fixes\n\nacquired (aquired)\ncontiguous (contigious)\nsuccessful (succesful, succesfull)\nsurprise (suprise)\nwhether (weather)\nsome other misspellings\n\nSigned-off-by: Andreas Mohr \u003candi@lisas.de\u003e\nSigned-off-by: Adrian Bunk \u003cbunk@stusta.de\u003e\n" }, { "commit": "fb1c8f93d869b34cacb8b8932e2b83d96a19d720", "tree": "a006d078aa02e421a7dc4793c335308204859d36", "parents": [ "4327edf6b8a7ac7dce144313947995538842d8fd" ], "author": { "name": "Ingo Molnar", "email": "mingo@elte.hu", "time": "Sat Sep 10 00:25:56 2005 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@g5.osdl.org", "time": "Sat Sep 10 10:06:21 2005 -0700" }, "message": "[PATCH] spinlock consolidation\n\nThis patch (written by me and also containing many suggestions of Arjan van\nde Ven) does a major cleanup of the spinlock code. It does the following\nthings:\n\n - consolidates and enhances the spinlock/rwlock debugging code\n\n - simplifies the asm/spinlock.h files\n\n - encapsulates the raw spinlock type and moves generic spinlock\n features (such as -\u003ebreak_lock) into the generic code.\n\n - cleans up the spinlock code hierarchy to get rid of the spaghetti.\n\nMost notably there\u0027s now only a single variant of the debugging code,\nlocated in lib/spinlock_debug.c. (previously we had one SMP debugging\nvariant per architecture, plus a separate generic one for UP builds)\n\nAlso, i\u0027ve enhanced the rwlock debugging facility, it will now track\nwrite-owners. There is new spinlock-owner/CPU-tracking on SMP builds too.\nAll locks have lockup detection now, which will work for both soft and hard\nspin/rwlock lockups.\n\nThe arch-level include files now only contain the minimally necessary\nsubset of the spinlock code - all the rest that can be generalized now\nlives in the generic headers:\n\n include/asm-i386/spinlock_types.h | 16\n include/asm-x86_64/spinlock_types.h | 16\n\nI have also split up the various spinlock variants into separate files,\nmaking it easier to see which does what. The new layout is:\n\n SMP | UP\n ----------------------------|-----------------------------------\n asm/spinlock_types_smp.h | linux/spinlock_types_up.h\n linux/spinlock_types.h | linux/spinlock_types.h\n asm/spinlock_smp.h | linux/spinlock_up.h\n linux/spinlock_api_smp.h | linux/spinlock_api_up.h\n linux/spinlock.h | linux/spinlock.h\n\n/*\n * here\u0027s the role of the various spinlock/rwlock related include files:\n *\n * on SMP builds:\n *\n * asm/spinlock_types.h: contains the raw_spinlock_t/raw_rwlock_t and the\n * initializers\n *\n * linux/spinlock_types.h:\n * defines the generic type and initializers\n *\n * asm/spinlock.h: contains the __raw_spin_*()/etc. lowlevel\n * implementations, mostly inline assembly code\n *\n * (also included on UP-debug builds:)\n *\n * linux/spinlock_api_smp.h:\n * contains the prototypes for the _spin_*() APIs.\n *\n * linux/spinlock.h: builds the final spin_*() APIs.\n *\n * on UP builds:\n *\n * linux/spinlock_type_up.h:\n * contains the generic, simplified UP spinlock type.\n * (which is an empty structure on non-debug builds)\n *\n * linux/spinlock_types.h:\n * defines the generic type and initializers\n *\n * linux/spinlock_up.h:\n * contains the __raw_spin_*()/etc. version of UP\n * builds. (which are NOPs on non-debug, non-preempt\n * builds)\n *\n * (included on UP-non-debug builds:)\n *\n * linux/spinlock_api_up.h:\n * builds the _spin_*() APIs.\n *\n * linux/spinlock.h: builds the final spin_*() APIs.\n */\n\nAll SMP and UP architectures are converted by this patch.\n\narm, i386, ia64, ppc, ppc64, s390/s390x, x64 was build-tested via\ncrosscompilers. m32r, mips, sh, sparc, have not been tested yet, but should\nbe mostly fine.\n\nFrom: Grant Grundler \u003cgrundler@parisc-linux.org\u003e\n\n Booted and lightly tested on a500-44 (64-bit, SMP kernel, dual CPU).\n Builds 32-bit SMP kernel (not booted or tested). I did not try to build\n non-SMP kernels. That should be trivial to fix up later if necessary.\n\n I converted bit ops atomic_hash lock to raw_spinlock_t. Doing so avoids\n some ugly nesting of linux/*.h and asm/*.h files. Those particular locks\n are well tested and contained entirely inside arch specific code. I do NOT\n expect any new issues to arise with them.\n\n If someone does ever need to use debug/metrics with them, then they will\n need to unravel this hairball between spinlocks, atomic ops, and bit ops\n that exist only because parisc has exactly one atomic instruction: LDCW\n (load and clear word).\n\nFrom: \"Luck, Tony\" \u003ctony.luck@intel.com\u003e\n\n ia64 fix\n\nSigned-off-by: Ingo Molnar \u003cmingo@elte.hu\u003e\nSigned-off-by: Arjan van de Ven \u003carjanv@infradead.org\u003e\nSigned-off-by: Grant Grundler \u003cgrundler@parisc-linux.org\u003e\nCc: Matthew Wilcox \u003cwilly@debian.org\u003e\nSigned-off-by: Hirokazu Takata \u003ctakata@linux-m32r.org\u003e\nSigned-off-by: Mikael Pettersson \u003cmikpe@csd.uu.se\u003e\nSigned-off-by: Benoit Boissinot \u003cbenoit.boissinot@ens-lyon.org\u003e\nSigned-off-by: Andrew Morton \u003cakpm@osdl.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n" }, { "commit": "39c715b71740c4a78ba4769fb54826929bac03cb", "tree": "94dd679dfc8e6c2db65971739aa8c8c6206f8174", "parents": [ "84929801e14d968caeb84795bfbb88f04283fbd9" ], "author": { "name": "Ingo Molnar", "email": "mingo@elte.hu", "time": "Tue Jun 21 17:14:34 2005 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@ppc970.osdl.org", "time": "Tue Jun 21 18:46:13 2005 -0700" }, "message": "[PATCH] smp_processor_id() cleanup\n\nThis patch implements a number of smp_processor_id() cleanup ideas that\nArjan van de Ven and I came up with.\n\nThe previous __smp_processor_id/_smp_processor_id/smp_processor_id API\nspaghetti was hard to follow both on the implementational and on the\nusage side.\n\nSome of the complexity arose from picking wrong names, some of the\ncomplexity comes from the fact that not all architectures defined\n__smp_processor_id.\n\nIn the new code, there are two externally visible symbols:\n\n - smp_processor_id(): debug variant.\n\n - raw_smp_processor_id(): nondebug variant. Replaces all existing\n uses of _smp_processor_id() and __smp_processor_id(). Defined\n by every SMP architecture in include/asm-*/smp.h.\n\nThere is one new internal symbol, dependent on DEBUG_PREEMPT:\n\n - debug_smp_processor_id(): internal debug variant, mapped to\n smp_processor_id().\n\nAlso, i moved debug_smp_processor_id() from lib/kernel_lock.c into a new\nlib/smp_processor_id.c file. All related comments got updated and/or\nclarified.\n\nI have build/boot tested the following 8 .config combinations on x86:\n\n {SMP,UP} x {PREEMPT,!PREEMPT} x {DEBUG_PREEMPT,!DEBUG_PREEMPT}\n\nI have also build/boot tested x64 on UP/PREEMPT/DEBUG_PREEMPT. (Other\narchitectures are untested, but should work just fine.)\n\nSigned-off-by: Ingo Molnar \u003cmingo@elte.hu\u003e\nSigned-off-by: Arjan van de Ven \u003carjan@infradead.org\u003e\nSigned-off-by: Andrew Morton \u003cakpm@osdl.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n" }, { "commit": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "tree": "0bba044c4ce775e45a88a51686b5d9f90697ea9d", "parents": [], "author": { "name": "Linus Torvalds", "email": "torvalds@ppc970.osdl.org", "time": "Sat Apr 16 15:20:36 2005 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@ppc970.osdl.org", "time": "Sat Apr 16 15:20:36 2005 -0700" }, "message": "Linux-2.6.12-rc2\n\nInitial git repository build. I\u0027m not bothering with the full history,\neven though we have it. We can create a separate \"historical\" git\narchive of that later if we want to, and in the meantime it\u0027s about\n3.2GB when imported into git - space that would just make the early\ngit days unnecessarily complicated, when we don\u0027t have a lot of good\ninfrastructure for it.\n\nLet it rip!\n" } ] }