linux-kernel - Re: [RFCv2 00/48] perf tools: Add threads to record command

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 for Android: free password hash cracker in your pocket

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

Message-ID: <20180914111528.GH24124@hirez.programming.kicks-ass.net>
Date:   Fri, 14 Sep 2018 13:15:28 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Jiri Olsa <jolsa@...hat.com>, Namhyung Kim <namhyung@...nel.org>,
        Alexey Budankov <alexey.budankov@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Andi Kleen <andi@...stfloor.org>, kernel-team@....com
Subject: Re: [RFCv2 00/48] perf tools: Add threads to record command

On Fri, Sep 14, 2018 at 11:40:22AM +0200, Ingo Molnar wrote:
> In fact keeping the files separate has scalability advantages for 'perf report' and similar 
> parsing tools: they could read all the streams in a per-CPU fashion already, from the very 
> beginning.

Also writing to different files from different CPUs is good for record,
less contention on the inode state (which include pagecache).