linux-kernel - Re: [PATCH 1/1] perf, tool: partial callgrap and time support in perf record

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] [day] [month] [year] [list]

Message-ID: <20150318191825.GA15335@tassilo.jf.intel.com>
Date:	Wed, 18 Mar 2015 12:18:25 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	"Liang, Kan" <kan.liang@...el.com>,
	"acme@...nel.org" <acme@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"eranian@...gle.com" <eranian@...gle.com>, jolsa@...nel.org
Subject: Re: [PATCH 1/1] perf, tool: partial callgrap and time support in
 perf record

> > The answer is no: it solves a different problem. Group read 
> > is just fine granuality counting. It cannot be used
> > to sample for multiple events in parallel.
> 
> But group read disables sampling for non-leader events so the number
> of total samples should be small, no?

Yes it's smaller, but it doesn't sample everything.

-Andi
--
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/