linux-kernel - Re: [PATCHSET 0/6] perf sched timehist: Introduce --idle-hist option (v2)

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:   Mon, 12 Dec 2016 10:37:30 -0700
From:   David Ahern <dsahern@...il.com>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Jiri Olsa <jolsa@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Andi Kleen <andi@...stfloor.org>,
        Minchan Kim <minchan@...nel.org>
Subject: Re: [PATCHSET 0/6] perf sched timehist: Introduce --idle-hist option
 (v2)

On 12/12/16 10:26 AM, Namhyung Kim wrote:
> Do you mean adding an elapsed time so that it can see the cpu utilization (or
> something similar)?  Then we need to expose the elapsed time during record or
> maybe just use time difference between first and last sample?

I was thinking tstart = time of first sample analyzed, tend = time of last sample analyzed, dt = tend - tstart.

If the analysis window (dt) is 5 seconds and each cpu is idle for 0.1 seconds of that 5 second window then the system is under high load.