From: Peter Zijlstra <peterz@infradead.org>
To: Ingo Molnar <mingo@kernel.org>
Cc: Pekka Enberg <penberg@kernel.org>,
Colin Cross <ccross@android.com>,
linux-kernel@vger.kernel.org,
Kyungmin Park <kmpark@infradead.org>,
Christoph Hellwig <hch@infradead.org>,
John Stultz <john.stultz@linaro.org>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Dave Hansen <dave.hansen@intel.com>,
Rob Landley <rob@landley.net>,
Andrew Morton <akpm@linux-foundation.org>,
Cyrill Gorcunov <gorcunov@openvz.org>,
David Rientjes <rientjes@google.com>,
Davidlohr Bueso <dave@gnu.org>, Kees Cook <keescook@chromium.org>,
Al Viro <viro@zeniv.linux.org.uk>,
Hugh Dickins <hughd@google.com>, Mel Gorman <mgorman@suse.de>,
Michel Lespinasse <walken@google.com>,
Rik van Riel <riel@redhat.com>,
Konstantin Khlebnikov <khlebnikov@openvz.org>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
David Howells <dhowells@redhat.com>,
Arnd Bergmann <arnd@arndb.de>, Dave Jones <davej@redhat.com>,
"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
Oleg Nesterov <oleg@redhat.com>, Shaohua Li <shli@fusionio.com>,
Sasha Levin <sasha.levin@oracle.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Johannes Weiner <hannes@cmpxchg.org>,
linux-doc@vger.kernel.org, linux-mm@kvack.org,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [PATCH 2/2] mm: add a field to store names for private anonymous memory
Date: Fri, 12 Jul 2013 11:00:46 +0200 [thread overview]
Message-ID: <20130712090046.GP25631@dyad.programming.kicks-ass.net> (raw)
In-Reply-To: <20130712084406.GB4328@gmail.com>
On Fri, Jul 12, 2013 at 10:44:06AM +0200, Ingo Molnar wrote:
> It makes tons of sense.
>
> Just like we have a task's cmd-name it makes a lot of sense to name
> objects in a human readable fashion, to help debugging, instrumentation,
> performance analysis, etc.
>
> Yes, in theory user-space could do all that. That's not the point: the
> point is to make it fast, easy enough and to have a central version (the
> kernel).
>
> Doing it via temporary files has various disadvantages:
We need those files anyway.. The current proposal is that the entire VMA has a
single userspace pointer in it. Or rather a 64bit value.
> I guess the real question is not whether it's useful, I think it clearly
> is. The question should be: are there real downsides? Does the addition to
> the anon mmap field blow up the size of vma_struct by a pointer, or is
> there still space?
I don't see how the single u64 is useful at all for perf; you can have at most
one u64 per page; that's not nearly enough to put symbol information in.
Therefore we still require external files.
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next prev parent reply other threads:[~2013-07-12 9:01 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-12 2:34 [PATCH 1/2] mm: rearrange madvise code to allow for reuse Colin Cross
2013-07-12 2:34 ` [PATCH 2/2] mm: add a field to store names for private anonymous memory Colin Cross
2013-07-12 5:39 ` Pekka Enberg
2013-07-12 8:13 ` Peter Zijlstra
2013-07-12 8:17 ` Peter Zijlstra
2013-07-12 8:44 ` Ingo Molnar
2013-07-12 8:55 ` Pekka Enberg
2013-07-12 9:00 ` Peter Zijlstra [this message]
2013-07-12 9:15 ` Ingo Molnar
2013-07-12 9:27 ` Peter Zijlstra
2013-07-12 9:40 ` Ingo Molnar
2013-07-12 9:49 ` Peter Zijlstra
2013-07-12 10:01 ` Ingo Molnar
2013-07-12 20:51 ` Colin Cross
2013-09-26 1:24 ` Colin Cross
2013-07-12 8:21 ` Pekka Enberg
2013-07-12 8:55 ` Peter Zijlstra
2013-07-12 9:04 ` Pekka Enberg
2013-07-12 9:14 ` Peter Zijlstra
2013-07-12 9:28 ` Ingo Molnar
2013-07-12 9:26 ` Ingo Molnar
2013-07-12 9:38 ` Pekka Enberg
2013-07-12 9:45 ` Ingo Molnar
2013-07-12 10:09 ` Peter Zijlstra
2013-07-12 5:43 ` Pekka Enberg
2013-07-12 6:18 ` Colin Cross
2013-07-12 7:03 ` Pekka Enberg
2013-07-12 6:36 ` Dave Hansen
2013-07-12 6:42 ` Colin Cross
2013-07-14 14:11 ` Oleg Nesterov
2013-07-14 19:27 ` Colin Cross
2013-07-14 14:17 ` Oleg Nesterov
2013-07-14 19:34 ` Colin Cross
-- strict thread matches above, loose matches on Subject: below --
2013-10-15 1:31 [PATCHv3 1/2] mm: rearrange madvise code to allow for reuse Colin Cross
2013-10-15 1:31 ` [PATCH 2/2] mm: add a field to store names for private anonymous memory Colin Cross
2013-10-15 1:31 ` Colin Cross
2013-10-15 21:21 ` Andrew Morton
2013-10-15 21:32 ` Dave Hansen
2013-10-15 21:47 ` Colin Cross
2013-10-15 21:47 ` Colin Cross
2013-10-16 0:33 ` Minchan Kim
2013-10-16 20:00 ` Colin Cross
2013-10-16 20:34 ` Dave Hansen
2013-10-16 20:41 ` Colin Cross
2013-10-17 2:47 ` Minchan Kim
2013-10-30 21:15 ` Colin Cross
2013-11-01 1:30 ` Minchan Kim
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