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perf/x86/cqm: Fix CQM memory leak and notifier leak 

Fixes the hotcpu notifier leak and other global variable memory leaks
during CQM (cache quality of service monitoring) initialization.

Signed-off-by: Vikas Shivappa <vikas.shivappa@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: fenghua.yu@intel.com
Cc: h.peter.anvin@intel.com
Cc: ravi.v.shankar@intel.com
Cc: vikas.shivappa@intel.com
Link: http://lkml.kernel.org/r/1457652732-4499-3-git-send-email-vikas.shivappa@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Vikas Shivappa 2016-03-10 15:32:08 -08:00 committed by Ingo Molnar
parent a223c1c7ab
commit ada2f634cd
1 changed files with 32 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
arch/x86/events/intel/cqm.c
View File

@ -211,6 +211,20 @@ static void __put_rmid(u32 rmid)
list_add_tail(&entry->list, &cqm_rmid_limbo_lru);
}
static void cqm_cleanup(void)
{
int i;
if (!cqm_rmid_ptrs)
return;
for (i = 0; i < cqm_max_rmid; i++)
kfree(cqm_rmid_ptrs[i]);
kfree(cqm_rmid_ptrs);
cqm_rmid_ptrs = NULL;
}
static int intel_cqm_setup_rmid_cache(void)
{
struct cqm_rmid_entry *entry;
@ -218,7 +232,7 @@ static int intel_cqm_setup_rmid_cache(void)
int r = 0;
nr_rmids = cqm_max_rmid + 1;
cqm_rmid_ptrs = kmalloc(sizeof(struct cqm_rmid_entry *) *
cqm_rmid_ptrs = kzalloc(sizeof(struct cqm_rmid_entry *) *
nr_rmids, GFP_KERNEL);
if (!cqm_rmid_ptrs)
return -ENOMEM;
@ -249,11 +263,9 @@ static int intel_cqm_setup_rmid_cache(void)
mutex_unlock(&cache_mutex);
return 0;
fail:
while (r--)
kfree(cqm_rmid_ptrs[r]);
kfree(cqm_rmid_ptrs);
fail:
cqm_cleanup();
return -ENOMEM;
}
@ -1312,7 +1324,7 @@ static const struct x86_cpu_id intel_cqm_match[] = {
static int __init intel_cqm_init(void)
{
char *str, scale[20];
char *str = NULL, scale[20];
int i, cpu, ret;
if (!x86_match_cpu(intel_cqm_match))
@ -1372,16 +1384,25 @@ static int __init intel_cqm_init(void)
cqm_pick_event_reader(i);
}
__perf_cpu_notifier(intel_cqm_cpu_notifier);
ret = perf_pmu_register(&intel_cqm_pmu, "intel_cqm", -1);
if (ret)
if (ret) {
pr_err("Intel CQM perf registration failed: %d\n", ret);
else
pr_info("Intel CQM monitoring enabled\n");
goto out;
}
pr_info("Intel CQM monitoring enabled\n");
/*
* Register the hot cpu notifier once we are sure cqm
* is enabled to avoid notifier leak.
*/
__perf_cpu_notifier(intel_cqm_cpu_notifier);
out:
cpu_notifier_register_done();
if (ret) {
kfree(str);
cqm_cleanup();
}
return ret;
}