linux-kernel - Re: [tip:perf/core] perf/x86: Use INST_RETIRED.PREC

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:	Sun, 6 Dec 2015 23:06:51 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	vincent.weaver@...ne.edu, jolsa@...hat.com,
	torvalds@...ux-foundation.org, eranian@...gle.com,
	tglx@...utronix.de, acme@...hat.com, ak@...ux.intel.com,
	linux-kernel@...r.kernel.org, hpa@...or.com,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:perf/core] perf/x86: Use INST_RETIRED.PREC_DIST for cycles:
 ppp

On Sun, Dec 06, 2015 at 02:11:02PM +0100, Ingo Molnar wrote:
> Also, I'm not convinced we need a new 'ppp' qualifier for any of this, why not 
> just replace 'pp' with this event - 'pp' is meant to be our most precise event.

I requested this because the PREC_DIST events can only be scheduled on a
single counter, whereas the existing :pp events can be had on all 4.

This mean you can have 2 concurrent :pp users (without RR), but not :ppp.
--
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/