linux-kernel - Re: [RFC PATCHSET] sched,perf: unify tracers in sched and move perf on top of TP

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: <20100506063116.GE1172@elte.hu>
Date:	Thu, 6 May 2010 08:31:16 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Tejun Heo <tj@...nel.org>, efault@....de, avi@...hat.com,
	paulus@...ba.org, acme@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCHSET] sched,perf: unify tracers in sched and move perf
 on top of TP


* Peter Zijlstra <peterz@...radead.org> wrote:

> Well, I'd much rather just see a direct call in the code than having to 
> reverse engineer wth hangs onto that _EVENT() junk.

Direct calls into code were fine 10 years ago, but since then we got:

 - preempt notifiers
 - sw events
 - tracepoints

Which add up to a lot more than just a plain call into code.

Also, with the jump-optimizations we will have tracepoints that are _cheaper_ 
than a plain function call.

> Also, we don't need ABI muck for this.

we already have an ABIs in place here - this would just properly unify and 
enumerate it.

	Ingo
--
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/