linux-kernel - Re: [PATCH] zram: fix possible race when checking idle

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Message-ID: <20150807091928.GM1891@swordfish>
Date:	Fri, 7 Aug 2015 18:19:28 +0900
From:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Cc:	Joonsoo Kim <js1304@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan@...nel.org>,
	Nitin Gupta <ngupta@...are.org>, linux-kernel@...r.kernel.org,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH] zram: fix possible race when checking idle_strm

On (08/07/15 18:14), Sergey Senozhatsky wrote:
[..]
> hm... we also can simply forbid downgrading a multi stream backend
> to a single stream (in terms of performance it is much slower
> than a real single steam anyway). will this do the trick? if we
> have more than 1 stream and idle list then there will be more that
> one wakeup. and every woken up task will call wakeup once it put
> stream.

this is unreadable, sorry.

should be:
"if we have more than 1 stream and _empty_ idle list then there
will be more than one wakeup. and every woken up task will call
wakeup once it puts stream back to the idle list."

	-ss
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