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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>
This commit is contained in:
Chris Phlipot 2016-05-10 20:26:46 -07:00 committed by Arnaldo Carvalho de Melo
parent 62665dff75
commit ae93a6c708
2 changed files with 15 additions and 0 deletions
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12
tools/perf/util/symbol.c
View File

@ -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)
{

3
tools/perf/util/symbol.h
View File

@ -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,