Re: [PATCH] zram: drop pp_in_progress

[Sergey Senozhatsky <senozhatsky@chromium.org>]

On (25/12/16 15:22), Sergey Senozhatsky wrote:
> pp_in_progress makes sure that only one post-processing
> (writeback or recomrpession) is active at any given time.
> Functionality wise it, basically, shadows zram init_lock,
> when init_lock is acquired in writer mode.
> 
> Switch recompress_store() and writeback_store() to take
> zram init_lock in writer mode, like all store() sysfs
> handlers should do, so that we can drop pp_in_progress.
> Recompression and writeback can be somewhat slow, so
> holding init_lock in writer mode can block zram attrs
> reads, but in reality the only zram attrs reads that
> take place are mm_stat reads, and usually it's the same
> process that reads mm_stat and does recompression or
> writeback.
> 
> Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>

Please disregard this one, there will be a follow-up patch.