Re: Linux 3.19-rc3

Re: Linux 3.19-rc3

[Michal Hocko]

[CCing linux-mm and CMA people]
[Full message here:
http://article.gmane.org/gmane.linux.ports.arm.kernel/383669]

On Thu 08-01-15 06:51:31, Mark Langsdorf wrote:
[...]
> [ 1053.968815] active_anon:207417 inactive_anon:25722 isolated_anon:0
> [ 1053.968815]  active_file:1300 inactive_file:21234 isolated_file:0
> [ 1053.968815]  unevictable:0 dirty:0 writeback:0 unstable:0
> [ 1053.968815]  free:1014 slab_reclaimable:1047 slab_unreclaimable:1758
> [ 1053.968815]  mapped:733 shmem:58 pagetables:267 bounce:0
> [ 1053.968815]  free_cma:1

Still a lot of pages (~80M) on the file LRU list which should be reclaimable
because they are not dirty apparently.
Anon pages can be reclaimed as well because the swap is basically
unused.

[...]
> [ 1054.095277] DMA: 109*64kB (UR) 53*128kB (R) 8*256kB (R) 0*512kB 0*1024kB
> 0*2048kB 1*4096kB (R) 0*8192kB 0*16384kB 1*32768kB (R) 0*65536kB = 52672kB
> [ 1054.108621] Normal: 191*64kB (MR) 0*128kB 0*256kB 0*512kB 0*1024kB
> 0*2048kB 0*4096kB 0*8192kB 0*16384kB 0*32768kB 0*65536kB = 12224kB
[...]
> [ 1054.142545] Free swap  = 6598400kB
> [ 1054.145928] Total swap = 8388544kB
> [ 1054.149317] 262112 pages RAM
> [ 1054.152180] 0 pages HighMem/MovableOnly
> [ 1054.155995] 18446744073709544361 pages reserved
> [ 1054.160505] 8192 pages cma reserved

Besides underflow in the reserved pages accounting mentioned in other
email the free lists look strange as well. All free blocks with some memory
are marked as reserved. I would suspect something CMA related.

-- 
Michal Hocko
SUSE Labs

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Re: Linux 3.19-rc3

[Mark Langsdorf]

On 01/08/2015 09:08 AM, Michal Hocko wrote:
> [CCing linux-mm and CMA people]
> [Full message here:
> http://article.gmane.org/gmane.linux.ports.arm.kernel/383669]

>> [ 1054.095277] DMA: 109*64kB (UR) 53*128kB (R) 8*256kB (R) 0*512kB 0*1024kB
>> 0*2048kB 1*4096kB (R) 0*8192kB 0*16384kB 1*32768kB (R) 0*65536kB = 52672kB
>> [ 1054.108621] Normal: 191*64kB (MR) 0*128kB 0*256kB 0*512kB 0*1024kB
>> 0*2048kB 0*4096kB 0*8192kB 0*16384kB 0*32768kB 0*65536kB = 12224kB
> [...]
>> [ 1054.142545] Free swap  = 6598400kB
>> [ 1054.145928] Total swap = 8388544kB
>> [ 1054.149317] 262112 pages RAM
>> [ 1054.152180] 0 pages HighMem/MovableOnly
>> [ 1054.155995] 18446744073709544361 pages reserved
>> [ 1054.160505] 8192 pages cma reserved
>
> Besides underflow in the reserved pages accounting mentioned in other
> email the free lists look strange as well. All free blocks with some memory
> are marked as reserved. I would suspect something CMA related.

I get the same failure with CMA turned off entirely. I assume that means
CMA is not the culprit.

--Mark Langsdorf

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Re: Linux 3.19-rc3

[Michal Hocko]

On Thu 08-01-15 10:37:50, Mark Langsdorf wrote:
> On 01/08/2015 09:08 AM, Michal Hocko wrote:
> >[CCing linux-mm and CMA people]
> >[Full message here:
> >http://article.gmane.org/gmane.linux.ports.arm.kernel/383669]
> 
> >>[ 1054.095277] DMA: 109*64kB (UR) 53*128kB (R) 8*256kB (R) 0*512kB 0*1024kB
> >>0*2048kB 1*4096kB (R) 0*8192kB 0*16384kB 1*32768kB (R) 0*65536kB = 52672kB
> >>[ 1054.108621] Normal: 191*64kB (MR) 0*128kB 0*256kB 0*512kB 0*1024kB
> >>0*2048kB 0*4096kB 0*8192kB 0*16384kB 0*32768kB 0*65536kB = 12224kB
> >[...]
> >>[ 1054.142545] Free swap  = 6598400kB
> >>[ 1054.145928] Total swap = 8388544kB
> >>[ 1054.149317] 262112 pages RAM
> >>[ 1054.152180] 0 pages HighMem/MovableOnly
> >>[ 1054.155995] 18446744073709544361 pages reserved
> >>[ 1054.160505] 8192 pages cma reserved
> >
> >Besides underflow in the reserved pages accounting mentioned in other
> >email the free lists look strange as well. All free blocks with some memory
> >are marked as reserved. I would suspect something CMA related.
> 
> I get the same failure with CMA turned off entirely. I assume that means
> CMA is not the culprit.

OK. Do you see all the free page blocks completely reserved without CMA
as well?

-- 
Michal Hocko
SUSE Labs

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