linux-kernel - Re: [PATCH 1/3] perf: use hrtimer for event multiplexing

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]

Message-ID: <1347044931.2124.5.camel@twins>
Date:	Fri, 07 Sep 2012 21:08:51 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, ak@...ux.intel.com,
	zheng.z.yan@...el.com, robert.richter@....com
Subject: Re: [PATCH 1/3] perf: use hrtimer for event multiplexing

On Fri, 2012-09-07 at 19:03 +0200, Stephane Eranian wrote:
> I think having different intervals would be a good thing, especially for uncore.
> But now, I am wondering how this could work without too much overhead.
> Looks like you're suggesting arming multiple hrtimers if multiple PMU are
> overcommitted. Is that right?

Right, we shoulnd't have too many PMUs anyway, let alone over committed
ones, so a timer per cpu per pmu should be fine.

>  As opposed to having a PMU multiplier off of a
> single per-cpu hrtimer.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/