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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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11
tools/perf/util/symbol.c
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@@ -18,6 +18,8 @@
#include "symbol.h"
#include "strlist.h"
#include "intlist.h"
#include "namespaces.h"
#include "vdso.h"
#include "header.h"
#include "path.h"
#include "sane_ctype.h"
@@ -1436,9 +1438,17 @@ int dso__load(struct dso *dso, struct map *map)
struct symsrc *syms_ss = NULL, *runtime_ss = NULL;
bool kmod;
unsigned char build_id[BUILD_ID_SIZE];
struct nscookie nsc;
nsinfo__mountns_enter(dso->nsinfo, &nsc);
pthread_mutex_lock(&dso->lock);
/* The vdso files always live in the host container, so don't go looking
* for them in the container's mount namespace.
*/
if (dso__is_vdso(dso))
nsinfo__mountns_exit(&nsc);
/* check again under the dso->lock */
if (dso__loaded(dso, map->type)) {
ret = 1;
@@ -1584,6 +1594,7 @@ out_free:
out:
dso__set_loaded(dso, map->type);
pthread_mutex_unlock(&dso->lock);
nsinfo__mountns_exit(&nsc);
return ret;
}