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From: Namhyung Kim <namhyung.kim@lge.com>
To: Tejun Heo <tj@kernel.org>
Cc: Namhyung Kim <namhyung@gmail.com>,
	axboe@kernel.dk, mingo@redhat.com, rostedt@goodmis.org,
	fweisbec@gmail.com, teravest@google.com, slavapestov@google.com,
	ctalbott@google.com, dhsharp@google.com,
	linux-kernel@vger.kernel.org, winget@google.com,
	Chanho Park <chanho61.park@samsung.com>
Subject: Re: [PATCH RESEND 9/9] block, trace: implement ioblame - IO tracer with origin tracking
Date: Thu, 12 Jan 2012 11:19:31 +0900	[thread overview]
Message-ID: <4F0E4333.6070607@lge.com> (raw)
In-Reply-To: <CAOS58YPi5_jsCTqBpNxDyy+cDcr-8WvqUe9r1qBbjdCOT22Q3w@mail.gmail.com>

2012-01-12 10:44 AM, Tejun Heo wrote:
> On Wed, Jan 11, 2012 at 5:41 PM, Namhyung Kim<namhyung.kim@lge.com>  wrote:
>> OK, but that can be controlled from userspace, I guess? Do we have to care
>> about that?
>
> Otherwise, it's gonna be a pretty silly interface. If you want to
> watch the TP, you have to restart the whole thing which also implies
> intent number would change. And there still is the problem of losing
> new intent events due to overflow. It just isn't the right interface
> for the task.
>

I understood it's unreliable. BTW I think that sane userland tool must 
start both of ioblame_io and ioblame_create_intent, say, TPs at once - 
prior to triggering ioblame/enable, obviously. The ioblame/intents can 
be used as a backup just in case.

Thanks,
Namhyung Kim

  reply	other threads:[~2012-01-12  2:19 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-01-10 18:28 [RFC PATCHSET take#2] ioblame: IO tracer with origin tracking Tejun Heo
2012-01-10 18:28 ` [PATCH 1/9] block: abstract disk iteration into disk_iter Tejun Heo
2012-01-10 18:28 ` [PATCH 2/9] block: block_bio_complete tracepoint was missing Tejun Heo
2012-01-11 17:25   ` Steven Rostedt
2012-01-11 17:30     ` Tejun Heo
2012-01-12  0:24       ` Namhyung Kim
2012-01-10 18:28 ` [PATCH 3/9] block: add @req to bio_{front|back}_merge tracepoints Tejun Heo
2012-01-10 18:28 ` [PATCH 4/9] writeback: move struct wb_writeback_work to writeback.h Tejun Heo
2012-01-10 18:28 ` [PATCH 5/9] writeback: add more tracepoints Tejun Heo
2012-01-10 18:28 ` [PATCH 6/9] block: add block_touch_buffer tracepoint Tejun Heo
2012-01-11 17:42   ` Steven Rostedt
2012-01-11 17:58     ` Tejun Heo
2012-01-10 18:28 ` [PATCH 7/9] vfs: add fcheck tracepoint Tejun Heo
2012-01-10 18:28 ` [PATCH 8/9] stacktrace: implement save_stack_trace_quick() Tejun Heo
2012-01-11 16:26   ` Frederic Weisbecker
2012-01-11 16:38     ` Tejun Heo
2012-01-11 17:37       ` Tejun Heo
2012-01-17  2:22       ` Frederic Weisbecker
2012-01-10 18:28 ` [PATCH 9/9] block, trace: implement ioblame - IO tracer with origin tracking Tejun Heo
2012-01-11  0:25   ` Chanho Park
2012-01-11  1:04     ` Tejun Heo
2012-01-11  1:32   ` [PATCH RESEND " Tejun Heo
2012-01-11  6:15     ` Namhyung Kim
2012-01-11 17:06       ` Tejun Heo
2012-01-12  1:05         ` Namhyung Kim
2012-01-12  1:14           ` Tejun Heo
2012-01-12  1:35             ` Namhyung Kim
2012-01-12  1:37               ` Tejun Heo
2012-01-12  1:40                 ` Namhyung Kim
2012-01-12  1:41                 ` Namhyung Kim
2012-01-12  1:44                   ` Tejun Heo
2012-01-12  2:19                     ` Namhyung Kim [this message]
2012-01-12  2:24                       ` Tejun Heo
2012-01-11 18:08     ` Tejun Heo
2012-01-11 14:40 ` [RFC PATCHSET take#2] ioblame: " Frederic Weisbecker
2012-01-11 17:02   ` Tejun Heo
2012-01-11 22:45     ` David Sharp

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