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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20151201081620.GA27574@bbox>
Date:	Tue, 1 Dec 2015 17:16:21 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
CC:	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 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? :)

Thanks.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/