Re: [PATCH V4 11/17] perf tools: Save previous cursor nodes for LBR stitching approach

From: Arnaldo Carvalho de Melo <arnaldo.melo@gmail.com>
To: kan.liang@linux.intel.com
Cc: jolsa@redhat.com, peterz@infradead.org, mingo@redhat.com,
	linux-kernel@vger.kernel.org, namhyung@kernel.org,
	adrian.hunter@intel.com, mathieu.poirier@linaro.org,
	ravi.bangoria@linux.ibm.com, alexey.budankov@linux.intel.com,
	vitaly.slobodskoy@intel.com, pavel.gerasimov@intel.com,
	mpe@ellerman.id.au, eranian@google.com, ak@linux.intel.com
Subject: Re: [PATCH V4 11/17] perf tools: Save previous cursor nodes for LBR stitching approach
Date: Fri, 17 Apr 2020 13:53:29 -0300	[thread overview]
Message-ID: <20200417165329.GE17973@kernel.org> (raw)
In-Reply-To: <20200319202517.23423-12-kan.liang@linux.intel.com>

Em Thu, Mar 19, 2020 at 01:25:11PM -0700, kan.liang@linux.intel.com escreveu:
> From: Kan Liang <kan.liang@linux.intel.com>
> 
> The cursor nodes which generates from sample are eventually added into
> callchain. To avoid generating cursor nodes from previous samples again,
> the previous cursor nodes are also saved for LBR stitching approach.
> 
> Some option, e.g. hide-unresolved, may hide some LBRs.
> Add a variable 'valid' in struct callchain_cursor_node to indicate this
> case. The LBR stitching approach will only append the valid cursor nodes
> from previous samples later.
> 
> Reviewed-by: Andi Kleen <ak@linux.intel.com>
> Signed-off-by: Kan Liang <kan.liang@linux.intel.com>

Applied this on top:

diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 6e7f15b45389..737dee723a57 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -2364,8 +2364,7 @@ static bool alloc_lbr_stitch(struct thread *thread, unsigned int max_lbr)
 	return true;
 
 free_lbr_stitch:
-	free(thread->lbr_stitch);
-	thread->lbr_stitch = NULL;
+	zfree(&thread->lbr_stitch);
 err:
 	pr_warning("Failed to allocate space for stitched LBRs. Disable LBR stitch\n");
 	thread->lbr_stitch_enable = false;
diff --git a/tools/perf/util/thread.h b/tools/perf/util/thread.h
index c2eb3f943724..8456174a52c5 100644
--- a/tools/perf/util/thread.h
+++ b/tools/perf/util/thread.h
@@ -161,7 +161,7 @@ static inline void thread__free_stitch_list(struct thread *thread)
 	if (!lbr_stitch)
 		return;
 
-	free(lbr_stitch->prev_lbr_cursor);
+	zfree(&lbr_stitch->prev_lbr_cursor);
 	zfree(&thread->lbr_stitch);
 }
 
