linux-kernel - Re: [PATCH v3 2/2] zram: try vmalloc() after kmalloc()

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Message-ID: <20151201091104.GA483@swordfish>
Date:	Tue, 1 Dec 2015 18:11:04 +0900
From:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:	Minchan Kim <minchan@...nel.org>
Cc:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
	Kyeongdon Kim <kyeongdon.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Subject: Re: [PATCH v3 2/2] zram: try vmalloc() after kmalloc()

On (12/01/15 17:16), Minchan Kim wrote:
> On Tue, Dec 01, 2015 at 04:15:42PM +0900, Sergey Senozhatsky wrote:
> > On (12/01/15 15:35), Kyeongdon Kim wrote:
> > [..]
> > > @test #4
> > >  kmalloc(f)
> > > __vmalloc(f)
> > > // cannot find failure both until now
> > > 
> > > log message (test #4) :
> > > <4>[  641.440468][7] KDKIM: zcomp_lz4_create: 24: ret = ffffffc002190000
> > > <snip>
> > > <4>[  922.182980][7] KDKIM: zcomp_lz4_create: 24: ret = ffffffc002208000
> > > <snip>
> > > <4>[  923.197593][7] KDKIM: zcomp_lz4_create: 24: ret = ffffffc002020000
> > > <snip>
> > > <4>[  939.813499][7] KDKIM: zcomp_lz4_create: 24: ret = ffffffc0020a0000
> > 
> > Thanks!
> > 
> > > So,is there another problem if we remove the flag from both sides?
> > > 
> > 
> > Technically, '~__GFP_NOMEMALLOC' is what we've been doing for some time (well,
> > always); and, as Minchan noted, zsmalloc does not depend on emergency pools.
> > 
> > I vote for removal of __GFP_NOMEMALLOC from both kmalloc() and __vmalloc().
> > 
> > (user can make ->max_strm big enough to deplete emergency mem; but I tend to
> > ignore it).
> > 
> > Minchan?
> 
> Agree. Do you mind resending patches? :)

OK, will do later today. Thanks.

	-ss
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