From: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
To: Minchan Kim <minchan@kernel.org>
Cc: "kyeongdon.kim" <kyeongdon.kim@lge.com>,
Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org,
Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Subject: Re: [PATCH v3 2/2] zram: try vmalloc() after kmalloc()
Date: Tue, 1 Dec 2015 09:33:47 +0900 [thread overview]
Message-ID: <20151201003347.GA653@swordfish> (raw)
In-Reply-To: <20151130231841.GA960@bbox>
On (12/01/15 08:18), Minchan Kim wrote:
[..]
> > As you know, if there is 'null' return, this function is called again to
> > get a memory in while() loop. I just checked this one with printk().
> >
> > If you guys don't mind, I'll test more with trace log to check time delay.
>
> No problem.
>
> >
> > However, If this is fully expectable status to you.
> > I think I don't need to do it.
>
> It's not what I expected. Actually, I thought failure of vmalloc
> in that place should be *really really* rare. I think it's caused by
> __GFP_NOMEMALLOC so I want to see test result without the flag.
hm, agree. otherwise the whole vmalloc() fallback thing adds a
little value. additional streams are really not that important
to waste emergency memory. a stream, once allocated, stays
forever (until user decrease the ->max_strm).
> Thanks for the careful test!
yes, thank you Kyeongdon.
-ss
next prev parent reply other threads:[~2015-12-01 0:32 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-27 4:10 [PATCH v3 0/2] zram/zcomp: stream allocation fixes and tweaks Sergey Senozhatsky
2015-11-27 4:10 ` [PATCH v3 1/2] zram/zcomp: use GFP_NOIO to allocate streams Sergey Senozhatsky
2015-11-30 7:09 ` Minchan Kim
2015-11-27 4:10 ` [PATCH v3 2/2] zram: try vmalloc() after kmalloc() Sergey Senozhatsky
2015-11-30 7:10 ` Minchan Kim
2015-11-30 10:42 ` kyeongdon.kim
2015-11-30 11:14 ` Sergey Senozhatsky
2015-12-01 2:04 ` kyeongdon.kim
[not found] ` <20151130231841.GA960@bbox>
2015-12-01 0:33 ` Sergey Senozhatsky [this message]
2015-12-01 2:31 ` kyeongdon.kim
2015-12-01 4:44 ` Minchan Kim
[not found] ` <20151201045535.GA5999@bbox>
2015-12-01 5:16 ` Sergey Senozhatsky
2015-12-01 6:35 ` Kyeongdon Kim
2015-12-01 7:15 ` Sergey Senozhatsky
2015-12-01 7:33 ` Sergey Senozhatsky
2015-12-01 8:16 ` Minchan Kim
2015-12-01 9:11 ` Sergey Senozhatsky
2015-12-01 7:24 ` Sergey Senozhatsky
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