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authorChris Phlipot <cphlipot0@gmail.com>2016-05-10 20:26:46 -0700
committerArnaldo Carvalho de Melo <acme@redhat.com>2016-05-11 12:24:57 -0300
commitae93a6c70838b87151ac12589dc507dbf4f2f067 (patch)
tree5cc36ec19cb956eecdc84087ffc14a43262c9c63 /tools/perf
parent62665dff754a80e2fdd214ef2ed21abb2a7d03a2 (diff)
downloadlinux-ae93a6c70838b87151ac12589dc507dbf4f2f067.tar.gz
perf symbols: Add dso__insert_symbol function
The current method for inserting symbols is to use the symbols__insert() function. However symbols__insert() does not update the dso symbol cache. This causes problems in the following scenario: 1. symbol not found at addr using dso__find_symbol 2. symbol inserted at addr using the existing symbols__insert function 3. symbol still not found at addr using dso__find_symbol() because cache isn't updated. This is undesired behavior. The undesired behavior in (3) is addressed by creating a new function, dso__insert_symbol() to both insert the symbol and update the symbol cache if necessary. If dso__insert_symbol() is used in (2) instead of symbols__insert(), then the undesired behavior in (3) is avoided. Signed-off-by: Chris Phlipot <cphlipot0@gmail.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/1462937209-6032-2-git-send-email-cphlipot0@gmail.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf')
-rw-r--r--tools/perf/util/symbol.c12
-rw-r--r--tools/perf/util/symbol.h3
2 files changed, 15 insertions, 0 deletions
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 2946295ca502..21af8e8891fe 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -413,6 +413,18 @@ void dso__reset_find_symbol_cache(struct dso *dso)
}
}
+void dso__insert_symbol(struct dso *dso, enum map_type type, struct symbol *sym)
+{
+ symbols__insert(&dso->symbols[type], sym);
+
+ /* update the symbol cache if necessary */
+ if (dso->last_find_result[type].addr >= sym->start &&
+ (dso->last_find_result[type].addr < sym->end ||
+ sym->start == sym->end)) {
+ dso->last_find_result[type].symbol = sym;
+ }
+}
+
struct symbol *dso__find_symbol(struct dso *dso,
enum map_type type, u64 addr)
{
diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
index 07211c2f8456..2b5e4ed76fcb 100644
--- a/tools/perf/util/symbol.h
+++ b/tools/perf/util/symbol.h
@@ -246,6 +246,9 @@ int __dso__load_kallsyms(struct dso *dso, const char *filename, struct map *map,
int dso__load_kallsyms(struct dso *dso, const char *filename, struct map *map,
symbol_filter_t filter);
+void dso__insert_symbol(struct dso *dso, enum map_type type,
+ struct symbol *sym);
+
struct symbol *dso__find_symbol(struct dso *dso, enum map_type type,
u64 addr);
struct symbol *dso__find_symbol_by_name(struct dso *dso, enum map_type type,