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From: Johannes Weiner <hannes@cmpxchg.org>
To: Guenter Roeck <linux@roeck-us.net>
Cc: akpm@linux-foundation.org, mm-commits@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	linux-fsdevel@vger.kernel.org, linux-next@vger.kernel.org,
	sfr@canb.auug.org.au, mhocko@suse.cz, cl@linux.com
Subject: Re: mmotm 2015-01-22-15-04: qemu failure due to 'mm: memcontrol: remove unnecessary soft limit tree node test'
Date: Fri, 23 Jan 2015 09:18:17 -0500	[thread overview]
Message-ID: <20150123141817.GA22926@phnom.home.cmpxchg.org> (raw)
In-Reply-To: <20150123050802.GB22751@roeck-us.net>

Hi Guenter,

CC'ing Christoph for slub-stuff:

On Thu, Jan 22, 2015 at 09:08:02PM -0800, Guenter Roeck wrote:
> On Thu, Jan 22, 2015 at 03:05:17PM -0800, akpm@linux-foundation.org wrote:
> > The mm-of-the-moment snapshot 2015-01-22-15-04 has been uploaded to
> > 
> >    http://www.ozlabs.org/~akpm/mmotm/
> > 
> qemu test for ppc64 fails with
> 
> Unable to handle kernel paging request for data at address 0x0000af50
> Faulting instruction address: 0xc00000000089d5d4
> Oops: Kernel access of bad area, sig: 11 [#1]
> 
> with the following call stack:
> 
> Call Trace:
> [c00000003d32f920] [c00000000089d588] .__slab_alloc.isra.44+0x7c/0x6f4
> (unreliable)
> [c00000003d32fa90] [c00000000020cf8c] .kmem_cache_alloc_node_trace+0x12c/0x3b0
> [c00000003d32fb60] [c000000000bceeb4] .mem_cgroup_init+0x128/0x1b0
> [c00000003d32fbf0] [c00000000000a2b4] .do_one_initcall+0xd4/0x260
> [c00000003d32fce0] [c000000000ba26a8] .kernel_init_freeable+0x244/0x32c
> [c00000003d32fdb0] [c00000000000ac24] .kernel_init+0x24/0x140
> [c00000003d32fe30] [c000000000009564] .ret_from_kernel_thread+0x58/0x74
> 
> bisect log:

[...]

> # first bad commit: [a40d0d2cf21e2714e9a6c842085148c938bf36ab] mm: memcontrol: remove unnecessary soft limit tree node test

The change in question is this:

    mm: memcontrol: remove unnecessary soft limit tree node test
    
    kzalloc_node() automatically falls back to nodes with suitable memory.
    
    Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
    Acked-by: Michal Hocko <mhocko@suse.cz>
    Reviewed-by: Vladimir Davydov <vdavydov@parallels.com>
    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index fb9788af4a3e..10db4a654d68 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4539,13 +4539,10 @@ static void __init mem_cgroup_soft_limit_tree_init(void)
 {
        struct mem_cgroup_tree_per_node *rtpn;
        struct mem_cgroup_tree_per_zone *rtpz;
-       int tmp, node, zone;
+       int node, zone;
 
        for_each_node(node) {
-               tmp = node;
-               if (!node_state(node, N_NORMAL_MEMORY))
-                       tmp = -1;
-               rtpn = kzalloc_node(sizeof(*rtpn), GFP_KERNEL, tmp);
+               rtpn = kzalloc_node(sizeof(*rtpn), GFP_KERNEL, node);
                BUG_ON(!rtpn);
 
                soft_limit_tree.rb_tree_per_node[node] = rtpn;

--

Is the assumption of this patch wrong?  Does the specified node have
to be online for the fallback to work?

Thanks

  reply	other threads:[~2015-01-23 14:18 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-22 23:05 mmotm 2015-01-22-15-04 uploaded akpm
2015-01-23  5:04 ` mmotm 2015-01-22-15-04: qemu failures due to 'mm: account pmd page tables to the process' Guenter Roeck
2015-01-23 11:13   ` Kirill A. Shutemov
2015-01-23 15:07     ` Guenter Roeck
2015-01-23 21:55       ` Andrew Morton
2015-01-24  2:44         ` Guenter Roeck
2015-01-24  3:05           ` Guenter Roeck
2015-01-24  5:52         ` Guenter Roeck
2015-01-26 12:29           ` Kirill A. Shutemov
2015-01-26 14:03             ` Guenter Roeck
2015-01-26 14:17               ` Guenter Roeck
2015-01-27 16:16               ` Kirill A. Shutemov
2015-01-27 16:24                 ` Guenter Roeck
2015-01-27 21:24                   ` Andrew Morton
2015-01-28  6:16                     ` Guenter Roeck
2015-01-23  5:08 ` mmotm 2015-01-22-15-04: qemu failure due to 'mm: memcontrol: remove unnecessary soft limit tree node test' Guenter Roeck
2015-01-23 14:18   ` Johannes Weiner [this message]
2015-01-23 15:17     ` Christoph Lameter
2015-01-23 16:02       ` Johannes Weiner
2015-01-23 16:59         ` Guenter Roeck
2015-01-23 17:36           ` Johannes Weiner
2015-01-23 17:38             ` Johannes Weiner
2015-01-24  2:02             ` Guenter Roeck
2015-01-27 17:24       ` Michal Hocko
2015-01-28 15:03         ` Christoph Lameter
2015-01-23 15:46     ` Guenter Roeck
2015-01-23 16:03       ` Johannes Weiner
2015-01-23 20:20     ` Christoph Lameter
2015-01-23 20:33       ` Guenter Roeck
2015-01-23 21:09         ` Christoph Lameter
2015-01-24  7:16           ` Johannes Weiner
2015-01-25 21:36             ` Valdis.Kletnieks
2015-01-26 13:37               ` Johannes Weiner

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