Re: [PATCH v2 1/3] Revert "perf session: Fix decompression of PERF_RECORD_COMPRESSED records"

Alexei Budankov
2020-12-01T21:05:25Z

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