perf: 'perf kvm' tool for monitoring guest performance from host
Here is the patch of userspace perf tool.
Signed-off-by: Zhang Yanmin <yanmin_zhang@linux.intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 628173b..75d0167 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -190,7 +190,8 @@
continue; \
else
-static int __dsos__write_buildid_table(struct list_head *head, u16 misc, int fd)
+static int __dsos__write_buildid_table(struct list_head *head, pid_t pid,
+ u16 misc, int fd)
{
struct dso *pos;
@@ -205,6 +206,7 @@
len = ALIGN(len, NAME_ALIGN);
memset(&b, 0, sizeof(b));
memcpy(&b.build_id, pos->build_id, sizeof(pos->build_id));
+ b.pid = pid;
b.header.misc = misc;
b.header.size = sizeof(b) + len;
err = do_write(fd, &b, sizeof(b));
@@ -219,13 +221,33 @@
return 0;
}
-static int dsos__write_buildid_table(int fd)
+static int dsos__write_buildid_table(struct perf_header *header, int fd)
{
- int err = __dsos__write_buildid_table(&dsos__kernel,
- PERF_RECORD_MISC_KERNEL, fd);
- if (err == 0)
- err = __dsos__write_buildid_table(&dsos__user,
- PERF_RECORD_MISC_USER, fd);
+ struct perf_session *session = container_of(header,
+ struct perf_session, header);
+ struct rb_node *nd;
+ int err = 0;
+ u16 kmisc, umisc;
+
+ for (nd = rb_first(&session->kerninfo_root); nd; nd = rb_next(nd)) {
+ struct kernel_info *pos = rb_entry(nd, struct kernel_info,
+ rb_node);
+ if (is_host_kernel(pos)) {
+ kmisc = PERF_RECORD_MISC_KERNEL;
+ umisc = PERF_RECORD_MISC_USER;
+ } else {
+ kmisc = PERF_RECORD_MISC_GUEST_KERNEL;
+ umisc = PERF_RECORD_MISC_GUEST_USER;
+ }
+
+ err = __dsos__write_buildid_table(&pos->dsos__kernel, pos->pid,
+ kmisc, fd);
+ if (err == 0)
+ err = __dsos__write_buildid_table(&pos->dsos__user,
+ pos->pid, umisc, fd);
+ if (err)
+ break;
+ }
return err;
}
@@ -342,9 +364,12 @@
return err;
}
-static int dsos__cache_build_ids(void)
+static int dsos__cache_build_ids(struct perf_header *self)
{
- int err_kernel, err_user;
+ struct perf_session *session = container_of(self,
+ struct perf_session, header);
+ struct rb_node *nd;
+ int ret = 0;
char debugdir[PATH_MAX];
snprintf(debugdir, sizeof(debugdir), "%s/%s", getenv("HOME"),
@@ -353,9 +378,30 @@
if (mkdir(debugdir, 0755) != 0 && errno != EEXIST)
return -1;
- err_kernel = __dsos__cache_build_ids(&dsos__kernel, debugdir);
- err_user = __dsos__cache_build_ids(&dsos__user, debugdir);
- return err_kernel || err_user ? -1 : 0;
+ for (nd = rb_first(&session->kerninfo_root); nd; nd = rb_next(nd)) {
+ struct kernel_info *pos = rb_entry(nd, struct kernel_info,
+ rb_node);
+ ret |= __dsos__cache_build_ids(&pos->dsos__kernel, debugdir);
+ ret |= __dsos__cache_build_ids(&pos->dsos__user, debugdir);
+ }
+ return ret ? -1 : 0;
+}
+
+static bool dsos__read_build_ids(struct perf_header *self, bool with_hits)
+{
+ bool ret = false;
+ struct perf_session *session = container_of(self,
+ struct perf_session, header);
+ struct rb_node *nd;
+
+ for (nd = rb_first(&session->kerninfo_root); nd; nd = rb_next(nd)) {
+ struct kernel_info *pos = rb_entry(nd, struct kernel_info,
+ rb_node);
+ ret |= __dsos__read_build_ids(&pos->dsos__kernel, with_hits);
+ ret |= __dsos__read_build_ids(&pos->dsos__user, with_hits);
+ }
+
+ return ret;
}
static int perf_header__adds_write(struct perf_header *self, int fd)
@@ -366,7 +412,7 @@
u64 sec_start;
int idx = 0, err;
- if (dsos__read_build_ids(true))
+ if (dsos__read_build_ids(self, true))
perf_header__set_feat(self, HEADER_BUILD_ID);
nr_sections = bitmap_weight(self->adds_features, HEADER_FEAT_BITS);
@@ -401,14 +447,14 @@
/* Write build-ids */
buildid_sec->offset = lseek(fd, 0, SEEK_CUR);
- err = dsos__write_buildid_table(fd);
+ err = dsos__write_buildid_table(self, fd);
if (err < 0) {
pr_debug("failed to write buildid table\n");
goto out_free;
}
buildid_sec->size = lseek(fd, 0, SEEK_CUR) -
buildid_sec->offset;
- dsos__cache_build_ids();
+ dsos__cache_build_ids(self);
}
lseek(fd, sec_start, SEEK_SET);
@@ -633,6 +679,85 @@
return 0;
}
+static int __event_process_build_id(struct build_id_event *bev,
+ char *filename,
+ struct perf_session *session)
+{
+ int err = -1;
+ struct list_head *head;
+ struct kernel_info *kerninfo;
+ u16 misc;
+ struct dso *dso;
+ enum dso_kernel_type dso_type;
+
+ kerninfo = kerninfo__findnew(&session->kerninfo_root, bev->pid);
+ if (!kerninfo)
+ goto out;
+
+ misc = bev->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
+
+ switch (misc) {
+ case PERF_RECORD_MISC_KERNEL:
+ dso_type = DSO_TYPE_KERNEL;
+ head = &kerninfo->dsos__kernel;
+ break;
+ case PERF_RECORD_MISC_GUEST_KERNEL:
+ dso_type = DSO_TYPE_GUEST_KERNEL;
+ head = &kerninfo->dsos__kernel;
+ break;
+ case PERF_RECORD_MISC_USER:
+ case PERF_RECORD_MISC_GUEST_USER:
+ dso_type = DSO_TYPE_USER;
+ head = &kerninfo->dsos__user;
+ break;
+ default:
+ goto out;
+ }
+
+ dso = __dsos__findnew(head, filename);
+ if (dso != NULL) {
+ dso__set_build_id(dso, &bev->build_id);
+ if (filename[0] == '[')
+ dso->kernel = dso_type;
+ }
+
+ err = 0;
+out:
+ return err;
+}
+
+static int perf_header__read_build_ids(struct perf_header *self,
+ int input, u64 offset, u64 size)
+{
+ struct perf_session *session = container_of(self,
+ struct perf_session, header);
+ struct build_id_event bev;
+ char filename[PATH_MAX];
+ u64 limit = offset + size;
+ int err = -1;
+
+ while (offset < limit) {
+ ssize_t len;
+
+ if (read(input, &bev, sizeof(bev)) != sizeof(bev))
+ goto out;
+
+ if (self->needs_swap)
+ perf_event_header__bswap(&bev.header);
+
+ len = bev.header.size - sizeof(bev);
+ if (read(input, filename, len) != len)
+ goto out;
+
+ __event_process_build_id(&bev, filename, session);
+
+ offset += bev.header.size;
+ }
+ err = 0;
+out:
+ return err;
+}
+
static int perf_file_section__process(struct perf_file_section *self,
struct perf_header *ph,
int feat, int fd)
@@ -989,6 +1114,7 @@
int event__synthesize_build_id(struct dso *pos, u16 misc,
event__handler_t process,
+ struct kernel_info *kerninfo,
struct perf_session *session)
{
event_t ev;
@@ -1005,6 +1131,7 @@
memcpy(&ev.build_id.build_id, pos->build_id, sizeof(pos->build_id));
ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
ev.build_id.header.misc = misc;
+ ev.build_id.pid = kerninfo->pid;
ev.build_id.header.size = sizeof(ev.build_id) + len;
memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len);
@@ -1015,6 +1142,7 @@
static int __event_synthesize_build_ids(struct list_head *head, u16 misc,
event__handler_t process,
+ struct kernel_info *kerninfo,
struct perf_session *session)
{
struct dso *pos;
@@ -1024,7 +1152,8 @@
if (!pos->hit)
continue;
- err = event__synthesize_build_id(pos, misc, process, session);
+ err = event__synthesize_build_id(pos, misc, process,
+ kerninfo, session);
if (err < 0)
return err;
}
@@ -1035,44 +1164,48 @@
int event__synthesize_build_ids(event__handler_t process,
struct perf_session *session)
{
- int err;
+ int err = 0;
+ u16 kmisc, umisc;
+ struct kernel_info *pos;
+ struct rb_node *nd;
- if (!dsos__read_build_ids(true))
+ if (!dsos__read_build_ids(&session->header, true))
return 0;
- err = __event_synthesize_build_ids(&dsos__kernel,
- PERF_RECORD_MISC_KERNEL,
- process, session);
- if (err == 0)
- err = __event_synthesize_build_ids(&dsos__user,
- PERF_RECORD_MISC_USER,
- process, session);
+ for (nd = rb_first(&session->kerninfo_root); nd; nd = rb_next(nd)) {
+ pos = rb_entry(nd, struct kernel_info, rb_node);
+ if (is_host_kernel(pos)) {
+ kmisc = PERF_RECORD_MISC_KERNEL;
+ umisc = PERF_RECORD_MISC_USER;
+ } else {
+ kmisc = PERF_RECORD_MISC_GUEST_KERNEL;
+ umisc = PERF_RECORD_MISC_GUEST_USER;
+ }
+
+ err = __event_synthesize_build_ids(&pos->dsos__kernel,
+ kmisc, process, pos, session);
+ if (err == 0)
+ err = __event_synthesize_build_ids(&pos->dsos__user,
+ umisc, process, pos, session);
+ if (err)
+ break;
+ }
if (err < 0) {
pr_debug("failed to synthesize build ids\n");
return err;
}
- dsos__cache_build_ids();
+ dsos__cache_build_ids(&session->header);
return 0;
}
int event__process_build_id(event_t *self,
- struct perf_session *session __unused)
+ struct perf_session *session)
{
- struct list_head *head = &dsos__user;
- struct dso *dso;
-
- if (self->build_id.header.misc & PERF_RECORD_MISC_KERNEL)
- head = &dsos__kernel;
-
- dso = __dsos__findnew(head, self->build_id.filename);
- if (dso != NULL) {
- dso__set_build_id(dso, &self->build_id.build_id);
- if (head == &dsos__kernel && self->build_id.filename[0] == '[')
- dso->kernel = 1;
- }
-
+ __event_process_build_id(&self->build_id,
+ self->build_id.filename,
+ session);
return 0;
}