linux-kernel - Re: [PATCH V6 09/14] perf/x86/intel: Support TopDown metrics on Ice Lake

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, 21 Jul 2020 10:38:59 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     kan.liang@...ux.intel.com, acme@...hat.com, mingo@...nel.org,
        linux-kernel@...r.kernel.org, jolsa@...nel.org, eranian@...gle.com,
        alexander.shishkin@...ux.intel.com
Subject: Re: [PATCH V6 09/14] perf/x86/intel: Support TopDown metrics on Ice
 Lake

> Also, that for_each_set_bit() loop, trying to find the events to
> update...
> 
> Can't we, instead, make the SLOTS update advance 5 running counters in
> cpuc and feed the events off of that?

The original patches implemented this through a perf transaction and a
cache.  I think what you're suggesting is similar to the old cache.

-Andi