linux-kernel - Re: [PATCH for-3.3/core] block: add missing block_bio

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]

Date:	Sat, 18 Feb 2012 12:31:54 +0900
From:	Namhyung Kim <namhyung@...il.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	dm-devel@...hat.com, Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH for-3.3/core] block: add missing block_bio_complete()
 tracepoint

Hi,

2012-02-17, 13:19 -0800, Tejun Heo:
> bio completion didn't kick block_bio_complete TP.  Only dm was
> explicitly triggering the TP on IO completion.  This makes
> block_bio_complete TP useless for tracers which want to know about
> bios, and all other bio based drivers skip generating blktrace
> completion events.
> 
> This patch makes all bio completions via bio_endio() generate
> block_bio_complete TP.
> 
> * Explicit trace_block_bio_complete() invocation removed from dm and
>   the trace point is unexported.
> 
> * @rq dropped from trace_block_bio_complete().  bios may fly around
>   w/o queue associated.  Verifying and accessing the assocaited queue
>   belongs to TP probes.
> 
> * blktrace now gets both request and bio completions.  Make it ignore
>   bio completions if request completion path is happening.
> 
> This makes all bio based drivers generate blktrace completion events
> properly and makes the block_bio_complete TP actually useful.
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Original-patch-by: Namhyung Kim <namhyung@...il.com>
> Cc: Tejun Heo <tj@...nel.org>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: dm-devel@...hat.com

Looks better to me, thanks. :)


-- 
Regards,
Namhyung Kim


--
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/