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| author | Leo Yan <leo.yan@linaro.org> | 2023-03-20 09:16:18 +0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2023-03-21 16:06:05 +0300 |
| commit | f1e8f25980968f7c18f1eb977bd1d5fd716325a5 (patch) | |
| tree | 644fc56a92772c32ab468b2ce27658e4bdf571e4 /tools/perf/util/hist.c | |
| parent | ea15483e7c55f73809cd9e208fff511966539ee5 (diff) | |
| download | linux-f1e8f25980968f7c18f1eb977bd1d5fd716325a5.tar.xz | |
perf kvm: Reference count 'struct kvm_info'
hists__add_entry_ops() doesn't allocate a new histogram entry if it has
an existing entry for a KVM event, in this case, find_create_kvm_event()
allocates a 'struct kvm_info' but it's not used by any histograms and
never freed.
To fix the memory leak, this patch first introduces a refcnt and a set
of functions for refcnt operations on 'struct kvm_info'. When the data
structure is not anymore used (the refcnt hits zero) kvm_info__zput()
will free the memory used.
Committer:
Provide a nop version of kvm_info__zput() to be used when
HAVE_KVM_STAT_SUPPORT isn't defined as it is used unconditionally in
hists__findnew_entry() and hist_entry__delete().
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20230320061619.29520-2-leo.yan@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/hist.c')
| -rw-r--r-- | tools/perf/util/hist.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c index 0c11f50abfec..b339ff863fe2 100644 --- a/tools/perf/util/hist.c +++ b/tools/perf/util/hist.c @@ -628,6 +628,8 @@ static struct hist_entry *hists__findnew_entry(struct hists *hists, block_info__zput(entry->block_info); + kvm_info__zput(entry->kvm_info); + /* If the map of an existing hist_entry has * become out-of-date due to an exec() or * similar, update it. Otherwise we will @@ -1324,6 +1326,9 @@ void hist_entry__delete(struct hist_entry *he) if (he->block_info) block_info__zput(he->block_info); + if (he->kvm_info) + kvm_info__zput(he->kvm_info); + zfree(&he->res_samples); zfree(&he->stat_acc); free_srcline(he->srcline); |