linux-kernel - Re: [PATCH] perf_events: fix broken intr throttling (v3)

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:	Tue, 14 Feb 2012 18:37:05 -0800
From:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Stephane Eranian <eranian@...gle.com>,
	Anton Blanchard <anton@...ba.org>,
	linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...e.hu,
	gleb@...hat.com, wcohen@...hat.com, vince@...ter.net,
	asharma@...com, andi@...stfloor.org, paulus@...ba.org,
	emunson@...bm.net, imunsie@....ibm.com,
	Matt Helsley <matthltc@...ibm.com>
Subject: Re: [PATCH] perf_events: fix broken intr throttling (v3)

Benjamin Herrenschmidt [benh@...nel.crashing.org] wrote:
| On Thu, 2012-02-09 at 19:19 -0800, Sukadev Bhattiprolu wrote:
| > Stephane Eranian [eranian@...gle.com] wrote:
| > | On Wed, Feb 8, 2012 at 12:32 PM, Anton Blanchard <anton@...ba.org> wrote:
| > | >
| > | > Hi,
| > | >
| > | > On Thu, 26 Jan 2012 17:03:19 +0100
| The powerpc .git tree is not useful at this point, I haven't opened
| powerpc -next yet so it's just all old stale stuff. Please work with
| upstream always unless you have a very good reason to use my tree. It's
| really only meant as a conduit between me and Linus or for -next.

Ok.

I tried this on current mainline (commit 13d261932) which now includes both
of Stephane's patches and repeated the nooploop test.

The problem still exists - the number of events reported on Power is far
fewer than without the patches.

Aggregated stats:
           TOTAL events:         78
            MMAP events:         47
            COMM events:          2
            EXIT events:          2
          SAMPLE events:         27
cycles stats:
           TOTAL events:         21
            MMAP events:          4
            COMM events:          1
            EXIT events:          2
          SAMPLE events:         14
cycles stats:
           TOTAL events:         13
          SAMPLE events:         13

Sukadev

--
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/