From: Andrew Morton <akpm@linux-foundation.org>
To: Ezequiel Garcia <elezegarcia@gmail.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Pekka Enberg <penberg@kernel.org>
Subject: Re: [PATCH 05/10] mm, util: Use dup_user to duplicate user memory
Date: Tue, 25 Sep 2012 14:29:48 -0700 [thread overview]
Message-ID: <20120925142948.6b062cb6.akpm@linux-foundation.org> (raw)
In-Reply-To: <1347137279-17568-5-git-send-email-elezegarcia@gmail.com>
On Sat, 8 Sep 2012 17:47:54 -0300
Ezequiel Garcia <elezegarcia@gmail.com> wrote:
> Previously the strndup_user allocation was being done through memdup_user,
> and the caller was wrongly traced as being strndup_user
> (the correct trace must report the caller of strndup_user).
>
> This is a common problem: in order to get accurate callsite tracing,
> a utils function can't allocate through another utils function,
> but instead do the allocation himself (or inlined).
>
> Here we fix this by creating an always inlined dup_user() function to
> performed the real allocation and to be used by memdup_user and strndup_user.
This patch increases util.o's text size by 238 bytes. A larger kernel
with a worsened cache footprint.
And we did this to get marginally improved tracing output? This sounds
like a bad tradeoff to me.
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2012-09-25 21:29 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-08 20:47 [PATCH 01/10] Makefile: Add option CONFIG_DISABLE_GCC_AUTOMATIC_INLINING Ezequiel Garcia
2012-09-08 20:47 ` [PATCH 02/10] mm, slob: Use NUMA_NO_NODE instead of -1 Ezequiel Garcia
2012-09-09 21:27 ` David Rientjes
2012-09-24 17:13 ` Ezequiel Garcia
2012-09-25 7:37 ` Pekka Enberg
2012-09-25 10:13 ` Ezequiel Garcia
2012-09-08 20:47 ` [PATCH 03/10] mm, slab: Remove silly function slab_buffer_size() Ezequiel Garcia
2012-09-09 21:28 ` David Rientjes
2012-09-08 20:47 ` [PATCH 04/10] mm, slob: Add support for kmalloc_track_caller() Ezequiel Garcia
2012-09-25 19:53 ` [patch slab/next] mm, slob: fix build breakage in __kmalloc_node_track_caller David Rientjes
2012-09-25 19:55 ` Ezequiel Garcia
2012-09-08 20:47 ` [PATCH 05/10] mm, util: Use dup_user to duplicate user memory Ezequiel Garcia
2012-09-25 7:15 ` Pekka Enberg
2012-09-25 21:29 ` Andrew Morton [this message]
2012-09-26 1:15 ` Ezequiel Garcia
2012-09-26 21:42 ` Andrew Morton
2012-09-26 21:51 ` Ezequiel Garcia
2012-09-08 20:47 ` [PATCH 06/10] mm, slab: Replace 'caller' type, void* -> unsigned long Ezequiel Garcia
2012-09-08 20:47 ` [PATCH 07/10] mm, slab: Match SLAB and SLUB kmem_cache_alloc_xxx_trace() prototype Ezequiel Garcia
2012-09-08 20:47 ` [PATCH 08/10] mm, slab: Rename __cache_alloc() -> slab_alloc() Ezequiel Garcia
2012-09-08 20:47 ` [PATCH 09/10] mm, slub: Rename slab_alloc() -> slab_alloc_node() to match SLAB Ezequiel Garcia
2012-09-08 20:47 ` [PATCH 10/10] mm: Factor SLAB and SLUB common code Ezequiel Garcia
2012-09-08 21:43 ` [PATCH 01/10] Makefile: Add option CONFIG_DISABLE_GCC_AUTOMATIC_INLINING Sam Ravnborg
2012-09-09 21:25 ` David Rientjes
2012-09-13 0:30 ` Ezequiel Garcia
2012-09-13 7:17 ` Michal Marek
2012-09-13 9:16 ` Ezequiel Garcia
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20120925142948.6b062cb6.akpm@linux-foundation.org \
--to=akpm@linux-foundation.org \
--cc=elezegarcia@gmail.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=penberg@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).