hi Michal
2016-05-23 22:47 GMT+08:00, Michal Hocko <mhocko@xxxxxxxxxx>:
> On Mon 23-05-16 14:47:51, yoma sophian wrote:
>> hi all:
>> I got something wired that
>> 1. in softirq, there is a page order 0 allocation request
>> 2. Normal/High zone are free enough for order 0 page.
>> 3. but somehow kernel return order 0 allocation fail.
>>
>> My kernel version is 3.10 and below is kernel log:
>> from memory info,
>
> Can you reproduce it with the current vanlilla tree?
I think it would be quite hard, since this allocation failuer comes
when a lot of program, such as Youtube, opera, etc. running on ARM
processor at the same time.
Or is there any patch in vanlilla tree I can used for checking?
>
> [...]
>> [ 94.586588] ksoftirqd/0: page allocation failure: order:0, mode:0x20
> [...]
>> [ 94.865776] Normal free:63768kB min:2000kB low:2500kB high:3000kB
> [...]
>> [ 8606.701343] CompositorTileW: page allocation failure: order:0,
>> mode:0x20
> [...]
>> [ 8606.703590] Normal free:60684kB min:2000kB low:2500kB high:3000kB
>
> This is a lot of free memory to block GFP_ATOMIC. One possible
> explanation would be that this is a race with somebody releasing a lot
I will try to add memory free at buffered_rmqueue like below xxx place
buffered_rmqueue -->
if (likely(order == 0)) {
..................
if (list_empty(list)) {
pcp->count += rmqueue_bulk(zone, 0,
pcp->batch, list,
migratetype, cold);
if (unlikely(list_empty(list)))
goto failed; xxxxx ==> to show
memory free info
}
> of memory. The free memory is surprisingly similar in both cases.
Would you please give me any clue that free memory silimar hint the
race condition happen?
Many Appreciate your kind suggestion,
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