From f1e8f25980968f7c18f1eb977bd1d5fd716325a5 Mon Sep 17 00:00:00 2001 From: Leo Yan Date: Mon, 20 Mar 2023 14:16:18 +0800 Subject: 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 Acked-by: Ian Rogers Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: Mark Rutland Cc: Namhyung Kim Cc: Peter Zijlstra Link: https://lore.kernel.org/r/20230320061619.29520-2-leo.yan@linaro.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/hist.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'tools/perf/util/hist.c') 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kvm_info); + /* If the map of an existing hist_entry has * become out-of-date due to an exec() or * similar, update it.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); -- cgit