From: Dave Jones <davej@redhat.com>
To: David Rientjes <rientjes@google.com>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>,
bhutchings@solarflare.com, linux-mm@kvack.org,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: mpol_to_str revisited.
Date: Mon, 8 Oct 2012 16:52:13 -0400 [thread overview]
Message-ID: <20121008205213.GA23211@redhat.com> (raw)
In-Reply-To: <alpine.DEB.2.00.1210081330160.18768@chino.kir.corp.google.com>
On Mon, Oct 08, 2012 at 01:35:42PM -0700, David Rientjes wrote:
> > unanswered question: why are the buffer sizes here different ? which is correct?
> >
> Given the current set of mempolicy modes and flags, it's 34, but this can
> change if new modes or flags are added with longer names. I see no reason
> why shmem shouldn't round up to the nearest power-of-2 of 64 like it
> already does, but 50 is certainly safe as well in task_mmu.c.
Ok. I'll leave that for now.
> > diff -durpN '--exclude-from=/home/davej/.exclude' src/git-trees/kernel/linux/fs/proc/task_mmu.c linux-dj/fs/proc/task_mmu.c
> > --- src/git-trees/kernel/linux/fs/proc/task_mmu.c 2012-05-31 22:32:46.778150675 -0400
> > +++ linux-dj/fs/proc/task_mmu.c 2012-10-04 19:31:41.269988984 -0400
> > @@ -1162,6 +1162,7 @@ static int show_numa_map(struct seq_file
> > struct mm_walk walk = {};
> > struct mempolicy *pol;
> > int n;
> > + int ret;
> > char buffer[50];
> >
> > if (!mm)
> > @@ -1178,7 +1179,11 @@ static int show_numa_map(struct seq_file
> > walk.mm = mm;
> >
> > pol = get_vma_policy(proc_priv->task, vma, vma->vm_start);
> > - mpol_to_str(buffer, sizeof(buffer), pol, 0);
> > + memset(buffer, 0, sizeof(buffer));
> > + ret = mpol_to_str(buffer, sizeof(buffer), pol, 0);
> > + if (ret < 0)
> > + return 0;
>
> We should need the mpol_cond_put(pol) here before returning.
good catch. I'll respin the patch later with this changed.
thanks,
Dave
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next prev parent reply other threads:[~2012-10-08 20:52 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-08 15:09 mpol_to_str revisited Dave Jones
2012-10-08 15:15 ` Dave Jones
2012-10-08 20:46 ` David Rientjes
2012-10-08 20:35 ` David Rientjes
2012-10-08 20:52 ` Dave Jones [this message]
2012-10-16 0:48 ` David Rientjes
2012-10-09 0:33 ` Ben Hutchings
2012-10-16 2:34 ` KOSAKI Motohiro
2012-10-16 3:58 ` David Rientjes
2012-10-16 5:10 ` KOSAKI Motohiro
2012-10-16 6:10 ` David Rientjes
2012-10-16 23:39 ` KOSAKI Motohiro
2012-10-17 0:12 ` David Rientjes
2012-10-17 0:31 ` [patch for-3.7] mm, mempolicy: fix printing stack contents in numa_maps David Rientjes
2012-10-17 1:38 ` KOSAKI Motohiro
2012-10-17 1:49 ` David Rientjes
2012-10-17 1:53 ` KOSAKI Motohiro
2012-10-17 4:05 ` Dave Jones
2012-10-17 5:24 ` David Rientjes
2012-10-17 5:42 ` Kamezawa Hiroyuki
2012-10-17 8:49 ` KOSAKI Motohiro
2012-10-17 19:50 ` David Rientjes
2012-10-17 21:05 ` KOSAKI Motohiro
2012-10-17 21:27 ` David Rientjes
2012-10-17 18:14 ` Dave Jones
2012-10-17 19:21 ` David Rientjes
2012-10-17 19:32 ` Dave Jones
2012-10-17 19:38 ` David Rientjes
2012-10-17 19:45 ` Dave Jones
2012-10-17 20:28 ` [patch for-3.7] mm, mempolicy: avoid taking mutex inside spinlock when reading numa_maps David Rientjes
2012-10-17 21:31 ` [patch for-3.7 v2] " David Rientjes
2012-10-18 4:06 ` Kamezawa Hiroyuki
2012-10-18 4:14 ` Linus Torvalds
2012-10-18 4:41 ` Kamezawa Hiroyuki
2012-10-18 4:34 ` Kamezawa Hiroyuki
2012-10-18 20:03 ` David Rientjes
2012-10-19 8:35 ` [patch for-3.7 v3] mm, mempolicy: hold task->mempolicy refcount while " Kamezawa Hiroyuki
2012-10-19 9:28 ` David Rientjes
2012-10-22 2:47 ` Kamezawa Hiroyuki
2012-10-22 20:55 ` Andrew Morton
2012-10-22 20:56 ` David Rientjes
2012-10-19 19:15 ` KOSAKI Motohiro
2012-10-19 6:51 ` [patch for-3.7 v2] mm, mempolicy: avoid taking mutex inside spinlock when " KOSAKI Motohiro
2012-10-18 4:35 ` David Rientjes
2012-10-24 23:30 ` [patch for-3.7] mm, mempolicy: fix printing stack contents in numa_maps Sasha Levin
2012-10-24 23:34 ` David Rientjes
2012-10-24 23:37 ` Sasha Levin
2012-10-25 0:08 ` David Rientjes
2012-10-25 0:54 ` KOSAKI Motohiro
2012-10-25 1:15 ` David Rientjes
2012-10-25 12:19 ` Peter Zijlstra
2012-10-25 14:39 ` Peter Zijlstra
2012-10-25 17:23 ` Sasha Levin
2012-10-25 20:22 ` David Rientjes
2012-10-25 23:09 ` Linus Torvalds
2012-10-26 8:48 ` Peter Zijlstra
2012-10-31 18:29 ` Sasha Levin
2012-11-21 0:59 ` Sasha Levin
2012-10-17 1:33 ` mpol_to_str revisited KOSAKI Motohiro
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