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