From: Oleg Nesterov <oleg@redhat.com>
To: Ingo Molnar <mingo@elte.hu>,
Peter Zijlstra <peterz@infradead.org>,
Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>,
Anton Arapov <anton@redhat.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/3] uprobes: change build_map_info() to try kmalloc(GFP_NOWAIT) first
Date: Tue, 5 Jun 2012 12:10:47 +0200 [thread overview]
Message-ID: <20120605101047.GA8822@redhat.com> (raw)
In-Reply-To: <20120604145315.GB6416@redhat.com>
On 06/04, Oleg Nesterov wrote:
>
> @@ -772,8 +772,13 @@ build_map_info(struct address_space *mapping, loff_t offset, bool is_register)
> continue;
>
> if (!prev) {
> - more++;
> - continue;
> + prev = kmalloc(sizeof(struct map_info),
> + GFP_NOWAIT | __GFP_NOMEMALLOC | __GFP_NOWARN);
> + if (!prev) {
> + more++;
> + continue;
> + }
> + prev->next = NULL;
> }
OK, this is not exactly right, it is pointless and wrong to
do kmalloc(GFP_NOWAIT) if it failed before (iow, more != 0).
Easy to fix, I'll send v2 tomorrow.
Oleg.
next prev parent reply other threads:[~2012-06-05 10:12 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-04 14:52 [PATCH 0/3] uprobes: make register/unregister O(n) Oleg Nesterov
2012-06-04 14:53 ` [PATCH 1/3] uprobes: rework register_for_each_vma() to make it O(n) Oleg Nesterov
2012-06-04 14:53 ` [PATCH 2/3] uprobes: change build_map_info() to try kmalloc(GFP_NOWAIT) first Oleg Nesterov
2012-06-04 14:59 ` Peter Zijlstra
2012-06-05 10:10 ` Oleg Nesterov [this message]
2012-06-04 14:53 ` [PATCH 3/3] uprobes: document uprobe_register() vs uprobe_mmap() race Oleg Nesterov
2012-06-04 15:00 ` Peter Zijlstra
2012-06-04 15:40 ` Oleg Nesterov
2012-06-04 14:57 ` [PATCH 0/3] uprobes: make register/unregister O(n) Peter Zijlstra
2012-06-04 17:37 ` Srikar Dronamraju
2012-06-04 18:41 ` Oleg Nesterov
2012-06-05 9:28 ` Srikar Dronamraju
2012-06-06 14:49 ` [PATCH v2 " Oleg Nesterov
2012-06-06 14:49 ` [PATCH v2 1/3] uprobes: rework register_for_each_vma() to make it O(n) Oleg Nesterov
2012-06-06 14:50 ` [PATCH v2 2/3] uprobes: change build_map_info() to try kmalloc(GFP_NOWAIT) first Oleg Nesterov
2012-06-06 14:50 ` [PATCH v2 3/3] uprobes: document uprobe_register() vs uprobe_mmap() race Oleg Nesterov
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=20120605101047.GA8822@redhat.com \
--to=oleg@redhat.com \
--cc=ananth@in.ibm.com \
--cc=anton@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=masami.hiramatsu.pt@hitachi.com \
--cc=mingo@elte.hu \
--cc=peterz@infradead.org \
--cc=srikar@linux.vnet.ibm.com \
--cc=torvalds@linux-foundation.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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.