system/linux
system/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux synced 2024-11-05 18:23:50 +00:00
Code Issues Projects Releases Packages Wiki Activity

perf report: Handle vDSO symbols properly

Browse source 
We were not looking up vDSO symbols properly, because they
are in the kallsyms but are user-mode entries.

Pass negative addresses to the kernel dso object, this
way we resolve them properly:

     0.05%  [kernel]: vread_tsc

Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: John Kacur <jkacur@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2009-06-03 10:39:26 +02:00
parent 5352f35d6a
commit ed966aac33
1 changed files with 15 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

15
Documentation/perf_counter/builtin-report.c
View file

@ -728,6 +728,8 @@ static int __cmd_report(void)
event->ip.pid,
(void *)(long)ip);
dprintf(" ... thread: %s:%d\n", thread->comm, thread->pid);
if (thread == NULL) {
fprintf(stderr, "problem processing %d event, skipping it.\n",
event->header.type);
@ -740,6 +742,8 @@ static int __cmd_report(void)
dso = kernel_dso;
dprintf(" ...... dso: %s\n", dso->name);
} else if (event->header.misc & PERF_EVENT_MISC_USER) {
show = SHOW_USER;
@ -749,11 +753,22 @@ static int __cmd_report(void)
if (map != NULL) {
dso = map->dso;
ip -= map->start + map->pgoff;
} else {
/*
* If this is outside of all known maps,
* and is a negative address, try to look it
* up in the kernel dso, as it might be a
* vsyscall (which executes in user-mode):
*/
if ((long long)ip < 0)
dso = kernel_dso;
}
dprintf(" ...... dso: %s\n", dso ? dso->name : "<not found>");
} else {
show = SHOW_HV;
level = 'H';
dprintf(" ...... dso: [hypervisor]\n");
}
if (show & show_mask) {