From: Dave Hansen <haveblue@us.ibm.com>
To: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: "Frank Ch. Eigler" <fche@redhat.com>,
akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, mbligh@google.com
Subject: Re: [RFC PATCH] LTTng instrumentation mm (updated)
Date: Tue, 04 Dec 2007 12:24:23 -0800 [thread overview]
Message-ID: <1196799863.6073.22.camel@localhost> (raw)
In-Reply-To: <20071204200558.GB1988@Krystal>
On Tue, 2007-12-04 at 15:05 -0500, Mathieu Desnoyers wrote:
> * Dave Hansen (haveblue@us.ibm.com) wrote:
> > On Tue, 2007-12-04 at 14:25 -0500, Mathieu Desnoyers wrote:
> > >
> > > - I also dump the equivalent of /proc/swaps (with kernel internal
> > > information) at trace start to know what swap files are currently
> > > used.
> >
> > What about just enhancing /proc/swaps so that this information can be
> > useful to people other than those doing traces?
>
> It includes an in-kernel struct file pointer, exporting it to userspace
> would be somewhat ugly.
What about just exporting the 'type' field that we use to index into
swap_info[]?
As far as /proc goes, it may not be _ideal_ for your traces, but it sure
beats not getting the information out at all. ;) I guess I'm just not
that familiar with the tracing requirements and I can't really assess
whether what you're asking for is reasonable, or horrible
over-engineering. Dunno.
-- Dave
WARNING: multiple messages have this Message-ID (diff)
From: Dave Hansen <haveblue@us.ibm.com>
To: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: "Frank Ch. Eigler" <fche@redhat.com>,
akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, mbligh@google.com
Subject: Re: [RFC PATCH] LTTng instrumentation mm (updated)
Date: Tue, 04 Dec 2007 12:24:23 -0800 [thread overview]
Message-ID: <1196799863.6073.22.camel@localhost> (raw)
In-Reply-To: <20071204200558.GB1988@Krystal>
On Tue, 2007-12-04 at 15:05 -0500, Mathieu Desnoyers wrote:
> * Dave Hansen (haveblue@us.ibm.com) wrote:
> > On Tue, 2007-12-04 at 14:25 -0500, Mathieu Desnoyers wrote:
> > >
> > > - I also dump the equivalent of /proc/swaps (with kernel internal
> > > information) at trace start to know what swap files are currently
> > > used.
> >
> > What about just enhancing /proc/swaps so that this information can be
> > useful to people other than those doing traces?
>
> It includes an in-kernel struct file pointer, exporting it to userspace
> would be somewhat ugly.
What about just exporting the 'type' field that we use to index into
swap_info[]?
As far as /proc goes, it may not be _ideal_ for your traces, but it sure
beats not getting the information out at all. ;) I guess I'm just not
that familiar with the tracing requirements and I can't really assess
whether what you're asking for is reasonable, or horrible
over-engineering. Dunno.
-- Dave
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next prev parent reply other threads:[~2007-12-04 20:24 UTC|newest]
Thread overview: 81+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-13 19:33 [RFC 0/7] LTTng Kernel Instrumentation (Architecture Independent) Mathieu Desnoyers
2007-11-13 19:33 ` [RFC 1/7] Include marker.h in kernel.h -- temporary, for code readability Mathieu Desnoyers
2007-11-13 19:33 ` [RFC 2/7] LTTng instrumentation fs Mathieu Desnoyers
2007-11-13 19:33 ` [RFC 3/7] LTTng instrumentation ipc Mathieu Desnoyers
2007-11-13 19:33 ` [RFC 4/7] LTTng instrumentation kernel Mathieu Desnoyers
2007-11-15 23:30 ` Mike Mason
2007-11-15 23:54 ` Mike Mason
2007-11-16 2:42 ` Mathieu Desnoyers
2007-11-16 2:22 ` Mathieu Desnoyers
2007-11-13 19:33 ` [RFC 5/7] LTTng instrumentation mm Mathieu Desnoyers
2007-11-13 19:33 ` Mathieu Desnoyers
2007-11-15 21:06 ` Dave Hansen
2007-11-15 21:06 ` Dave Hansen
2007-11-15 21:51 ` Mathieu Desnoyers
2007-11-15 21:51 ` Mathieu Desnoyers
2007-11-15 22:16 ` Dave Hansen
2007-11-15 22:16 ` Dave Hansen
2007-11-16 14:30 ` Mathieu Desnoyers
2007-11-16 14:30 ` Mathieu Desnoyers
2007-11-19 18:04 ` Dave Hansen
2007-11-19 18:04 ` Dave Hansen
2007-11-28 14:09 ` [RFC PATCH] LTTng instrumentation mm (using page_to_pfn) Mathieu Desnoyers
2007-11-28 14:09 ` Mathieu Desnoyers
2007-11-28 16:54 ` Dave Hansen
2007-11-28 16:54 ` Dave Hansen
2007-11-29 2:34 ` Mathieu Desnoyers
2007-11-29 2:34 ` Mathieu Desnoyers
2007-11-29 6:25 ` Dave Hansen
2007-11-29 6:25 ` Dave Hansen
2007-11-30 16:11 ` [RFC PATCH] LTTng instrumentation mm (updated) Mathieu Desnoyers
2007-11-30 16:11 ` Mathieu Desnoyers
2007-11-30 17:46 ` Dave Hansen
2007-11-30 17:46 ` Dave Hansen
2007-11-30 17:05 ` Mathieu Desnoyers
2007-11-30 17:05 ` Mathieu Desnoyers
2007-11-30 18:42 ` Dave Hansen
2007-11-30 18:42 ` Dave Hansen
2007-11-30 19:10 ` Mathieu Desnoyers
2007-11-30 19:10 ` Mathieu Desnoyers
2007-12-04 19:15 ` Frank Ch. Eigler
2007-12-04 19:15 ` Frank Ch. Eigler
2007-12-04 19:25 ` Mathieu Desnoyers
2007-12-04 19:25 ` Mathieu Desnoyers
2007-12-04 19:40 ` Dave Hansen
2007-12-04 19:40 ` Dave Hansen
2007-12-04 20:05 ` Mathieu Desnoyers
2007-12-04 20:05 ` Mathieu Desnoyers
2007-12-04 20:24 ` Dave Hansen [this message]
2007-12-04 20:24 ` Dave Hansen
2007-12-04 20:28 ` Dave Hansen
2007-12-04 20:28 ` Dave Hansen
2007-11-16 14:47 ` [RFC 5/7] LTTng instrumentation mm Mathieu Desnoyers
2007-11-16 14:47 ` Mathieu Desnoyers
2007-11-19 18:07 ` Dave Hansen
2007-11-19 18:07 ` Dave Hansen
2007-11-19 18:52 ` Mathieu Desnoyers
2007-11-19 18:52 ` Mathieu Desnoyers
2007-11-19 19:00 ` Mathieu Desnoyers
2007-11-19 19:00 ` Mathieu Desnoyers
2007-11-19 19:43 ` Dave Hansen
2007-11-19 19:43 ` Dave Hansen
2007-11-19 19:43 ` Dave Hansen
2007-11-19 19:43 ` Dave Hansen
2007-11-19 19:52 ` [PATCH] Cast __page_to_pfn to unsigned long in CONFIG_SPARSEMEM Mathieu Desnoyers
2007-11-19 19:52 ` Mathieu Desnoyers
2007-11-19 20:09 ` Dave Hansen
2007-11-19 20:09 ` Dave Hansen
2007-11-19 20:20 ` [PATCH] Cast page_to_pfn " Mathieu Desnoyers
2007-11-19 20:20 ` Mathieu Desnoyers
2007-11-19 21:08 ` Andrew Morton
2007-11-19 21:08 ` Andrew Morton
2007-11-19 21:19 ` Dave Hansen
2007-11-19 21:19 ` Dave Hansen
2007-11-19 21:26 ` Dave Hansen
2007-11-19 21:26 ` Dave Hansen
2007-11-21 20:12 ` Christoph Lameter
2007-11-21 20:12 ` Christoph Lameter
2007-11-20 17:34 ` Mathieu Desnoyers
2007-11-20 17:34 ` Mathieu Desnoyers
2007-11-13 19:33 ` [RFC 6/7] LTTng instrumentation net Mathieu Desnoyers
2007-11-13 19:33 ` [RFC 7/7] Add Markers Into Semaphore Primitives Mathieu Desnoyers
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