linux-kernel - Re: [PATCH v4 00/12] Introduce threaded trace streaming for basic perf record operation

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Date:   Thu, 8 Apr 2021 23:52:22 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     "Bayduraev, Alexey V" <alexey.v.bayduraev@...ux.intel.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Alexei Budankov <abudankov@...wei.com>,
        Alexander Antonov <alexander.antonov@...ux.intel.com>
Subject: Re: [PATCH v4 00/12] Introduce threaded trace streaming for basic
 perf record operation

On Tue, Apr 06, 2021 at 11:37:26AM +0300, Bayduraev, Alexey V wrote:
> 
> Changes in v4:
> - renamed 'comm' structure to 'pipes'
> - moved thread fd/maps messages to verbose=2
> - fixed leaks during allocation of thread_data structures
> - fixed leaks during allocation of thread masks
> - fixed possible fails when releasing thread masks
> 
> v3: https://lore.kernel.org/lkml/7d197a2d-56e2-896d-bf96-6de0a4db1fb8@linux.intel.com/

hi,
I recall there was some issue wrt threading and intel_pt,
which we either need to fixed or we need to disable threads
for it

	[root@...va perf]# ./perf record -e intel_pt// --threads=cpu
	^C[ perf record: Woken up 121 times to write data ]
	Warning:
	AUX data lost 95 times out of 206!

	[ perf record: Captured and wrote 211.364 MB perf.data ]

	[root@...va perf]# ./perf script
	Segmentation fault (core dumped)

the fix should already be in the perf/record_threads branch,

jirka