* [stable] upstream 3d5fe03a3ea01 -stable backport request
@ 2016-01-25 12:46 Sergey Senozhatsky
2016-01-25 13:01 ` Sergey Senozhatsky
0 siblings, 1 reply; 2+ messages in thread
From: Sergey Senozhatsky @ 2016-01-25 12:46 UTC (permalink / raw)
To: stable
Cc: Minchan Kim, Andrew Morton, Kyeongdon Kim, linux-kernel,
Sergey Senozhatsky, Sergey Senozhatsky
Hello,
Please add upstream 'commit 3d5fe03a3ea01 ("zram/zcomp: use
GFP_NOIO to allocate streams")' to stable releases.
:commit 3d5fe03a3ea013060ebba2a811aeb0f23f56aefa
:Author: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
:
: zram/zcomp: use GFP_NOIO to allocate streams
:
: We can end up allocating a new compression stream with GFP_KERNEL from
: within the IO path, which may result is nested (recursive) IO
: operations. That can introduce problems if the IO path in question is a
: reclaimer, holding some locks that will deadlock nested IOs.
:
: Allocate streams and working memory using GFP_NOIO flag, forbidding
: recursive IO and FS operations.
-ss
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [stable] upstream 3d5fe03a3ea01 -stable backport request
2016-01-25 12:46 [stable] upstream 3d5fe03a3ea01 -stable backport request Sergey Senozhatsky
@ 2016-01-25 13:01 ` Sergey Senozhatsky
0 siblings, 0 replies; 2+ messages in thread
From: Sergey Senozhatsky @ 2016-01-25 13:01 UTC (permalink / raw)
To: Sergey Senozhatsky
Cc: stable, Minchan Kim, Andrew Morton, Kyeongdon Kim, linux-kernel,
Sergey Senozhatsky
On (01/25/16 21:46), Sergey Senozhatsky wrote:
>
> Hello,
>
> Please add upstream 'commit 3d5fe03a3ea01 ("zram/zcomp: use
> GFP_NOIO to allocate streams")' to stable releases.
>
[v3.15+]
-ss
>
> :commit 3d5fe03a3ea013060ebba2a811aeb0f23f56aefa
> :Author: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
> :
> : zram/zcomp: use GFP_NOIO to allocate streams
> :
> : We can end up allocating a new compression stream with GFP_KERNEL from
> : within the IO path, which may result is nested (recursive) IO
> : operations. That can introduce problems if the IO path in question is a
> : reclaimer, holding some locks that will deadlock nested IOs.
> :
> : Allocate streams and working memory using GFP_NOIO flag, forbidding
> : recursive IO and FS operations.
>
>
> -ss
>
^ permalink raw reply [flat|nested] 2+ messages in thread
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2016-01-25 12:46 [stable] upstream 3d5fe03a3ea01 -stable backport request Sergey Senozhatsky
2016-01-25 13:01 ` Sergey Senozhatsky
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