linux-kernel - Re: [PATCH v4 02/10] perf record: implement -f,--mmap-flush=<threshold> option

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 28 Feb 2019 23:19:44 +0300
From:   Alexey Budankov <alexey.budankov@...ux.intel.com>
To:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
Cc:     Jiri Olsa <jolsa@...hat.com>, Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 02/10] perf record: implement
 -f,--mmap-flush=<threshold> option


On 28.02.2019 21:44, Arnaldo Carvalho de Melo wrote:
> Em Thu, Feb 28, 2019 at 12:00:41PM +0300, Alexey Budankov escreveu:
>>
>> Implemented -f,--mmap-flush option that specifies threshold to postpone
>> and/or trigger the move of data from mmaped kernel buffers to a storage.
>> The option can be used to avoid capturing every single byte of data into
>> the stored trace. The default option value is 1.
> 
> Can you add something here explain more clearly what this means, and
> also on the tools/perf/Documentation/perf-record.txt file? Something
> like a paragraph explaining when is that there is a mmap flush normally,
> or rephrase what you wrote if you think you said that.

Will try to rephrase and may be provide some description of 
cases that this option can specifically address.

Thanks,
Alexey

> 
> - Arnaldo
> 
>  
<SNIP>