linux-kernel - Re: [PATCH v2 1/3] Revert "perf session: Fix decompression of PERF_RECORD

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Date:   Wed, 2 Dec 2020 00:04:23 +0300
From:   Alexei Budankov <abudankov@...wei.com>
To:     Jiri Olsa <jolsa@...hat.com>, Petr Malat <oss@...at.biz>,
        <alexey.bayduraev@...ux.intel.com>
CC:     <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Kan Liang <kan.liang@...ux.intel.com>, <abudankov@...wei.com>
Subject: Re: [PATCH v2 1/3] Revert "perf session: Fix decompression of
 PERF_RECORD_COMPRESSED records"


On 01.12.2020 22:09, Jiri Olsa wrote:
> On Mon, Nov 30, 2020 at 12:40:20PM +0100, Petr Malat wrote:
>> Hi Jiří,
>> were you able to reproduce the issue? I may also upload perf-archive
>> if that would help.
> 
> oh yea ;-) seems like those 2 commits you reverted broke 32 bits
> perf for data files > 32MB
> 
> but the fix you did does not work for Alexey's test he mentioned
> in the commit:
> 
>       $ perf record -z -- some_long_running_workload
>       $ perf report --stdio -vv
> 
> it's failing for me with:
> 
> 	# ./perf report
> 	Couldn't allocate memory for decompression
> 	0xfe6f3a [0x60]: failed to process type: 81 [Operation not permitted]
> 	Error:
> 	failed to process sample
> 	# To display the perf.data header info, please use --header/--header-only options.
> 	#
> 
> I think that's why here's special handling for compressed
> events, but I'll need to check on that in more detail,
> I was hoping for Alexey to answer ;-)

Sorry for delay. Alexey Bayduraev could possibly help with that sooner.
Alexey, could you please follow up.

Thanks,
Alexei