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perf symbols: Find symbols in different mount namespace

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Teach perf how to resolve symbols from binaries that are in a different
mount namespace from the tool.  This allows perf to generate meaningful
stack traces even if the binary resides in a different mount namespace
from the tool.

Signed-off-by: Krister Johansen <kjlx@templeofstupid.com>
Tested-by: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas-Mich Richter <tmricht@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/r/1499305693-1599-2-git-send-email-kjlx@templeofstupid.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Krister Johansen
2017-07-05 18:48:08 -07:00
committed by Arnaldo Carvalho de Melo
parent 86bcdb5a43
commit 843ff37bb5
8 changed files with 180 additions and 0 deletions
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3
tools/perf/util/thread.c
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@@ -59,6 +59,8 @@ struct thread *thread__new(pid_t pid, pid_t tid)
list_add(&comm->list, &thread->comm_list);
refcount_set(&thread->refcnt, 1);
RB_CLEAR_NODE(&thread->rb_node);
/* Thread holds first ref to nsdata. */
thread->nsinfo = nsinfo__new(pid);
}
return thread;
@@ -91,6 +93,7 @@ void thread__delete(struct thread *thread)
comm__free(comm);
}
unwind__finish_access(thread);
nsinfo__zput(thread->nsinfo);
free(thread);
}