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perf auxtrace: Add auxtrace_cache__remove()

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Add auxtrace_cache__remove(). Intel PT uses an auxtrace_cache to store
the results of code-walking, so that the same block of instructions does
not have to be decoded repeatedly. However, when there are text poke
events, the associated cache entries need to be removed.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: x86@kernel.org
Link: http://lore.kernel.org/lkml/20191025130000.13032-6-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2019-10-25 15:59:59 +03:00 committed by Arnaldo Carvalho de Melo
parent af04dd2f8e
commit fd62c1097a
2 changed files with 29 additions and 0 deletions
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28
tools/perf/util/auxtrace.c
View File

@ -1457,6 +1457,34 @@ int auxtrace_cache__add(struct auxtrace_cache *c, u32 key,
return 0;
}
static struct auxtrace_cache_entry *auxtrace_cache__rm(struct auxtrace_cache *c,
u32 key)
{
struct auxtrace_cache_entry *entry;
struct hlist_head *hlist;
struct hlist_node *n;
if (!c)
return NULL;
hlist = &c->hashtable[hash_32(key, c->bits)];
hlist_for_each_entry_safe(entry, n, hlist, hash) {
if (entry->key == key) {
hlist_del(&entry->hash);
return entry;
}
}
return NULL;
}
void auxtrace_cache__remove(struct auxtrace_cache *c, u32 key)
{
struct auxtrace_cache_entry *entry = auxtrace_cache__rm(c, key);
auxtrace_cache__free_entry(c, entry);
}
void *auxtrace_cache__lookup(struct auxtrace_cache *c, u32 key)
{
struct auxtrace_cache_entry *entry;

1
tools/perf/util/auxtrace.h
View File

@ -489,6 +489,7 @@ void *auxtrace_cache__alloc_entry(struct auxtrace_cache *c);
void auxtrace_cache__free_entry(struct auxtrace_cache *c, void *entry);
int auxtrace_cache__add(struct auxtrace_cache *c, u32 key,
struct auxtrace_cache_entry *entry);
void auxtrace_cache__remove(struct auxtrace_cache *c, u32 key);
void *auxtrace_cache__lookup(struct auxtrace_cache *c, u32 key);
struct auxtrace_record *auxtrace_record__init(struct evlist *evlist,