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Date:   Thu, 8 Apr 2021 23:52:22 +0200
From:   Jiri Olsa <jolsa@redhat.com>
To:     "Bayduraev, Alexey V" <alexey.v.bayduraev@linux.intel.com>
Cc:     Arnaldo Carvalho de Melo <acme@kernel.org>,
        Namhyung Kim <namhyung@kernel.org>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        Andi Kleen <ak@linux.intel.com>,
        Adrian Hunter <adrian.hunter@intel.com>,
        Alexei Budankov <abudankov@huawei.com>,
        Alexander Antonov <alexander.antonov@linux.intel.com>
Subject: Re: [PATCH v4 00/12] Introduce threaded trace streaming for basic
 perf record operation
Message-ID: <YG97FgUuqp/fCH0a@krava>
References: <6c15adcb-6a9d-320e-70b5-957c4c8b6ff2@linux.intel.com>
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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@krava 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@krava perf]# ./perf script
	Segmentation fault (core dumped)

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

jirka