From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail137.messagelabs.com (mail137.messagelabs.com [216.82.249.19]) by kanga.kvack.org (Postfix) with ESMTP id 64D248D0039 for ; Wed, 9 Feb 2011 18:58:21 -0500 (EST) Received: by iwc10 with SMTP id 10so712252iwc.14 for ; Wed, 09 Feb 2011 15:58:19 -0800 (PST) MIME-Version: 1.0 In-Reply-To: References: <5c529b08-cf36-43c7-b368-f3f602faf358@default> Date: Thu, 10 Feb 2011 08:58:19 +0900 Message-ID: Subject: Re: [PATCH V2 2/3] drivers/staging: zcache: host services and PAM services From: Minchan Kim Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Sender: owner-linux-mm@kvack.org List-ID: To: Dan Magenheimer Cc: gregkh@suse.de, Chris Mason , akpm@linux-foundation.org, torvalds@linux-foundation.org, matthew@wil.cx, linux-kernel@vger.kernel.org, linux-mm@kvack.org, ngupta@vflare.org, jeremy@goop.org, Kurt Hackel , npiggin@kernel.dk, riel@redhat.com, Konrad Wilk , mel@csn.ul.ie, kosaki.motohiro@jp.fujitsu.com, sfr@canb.auug.org.au, wfg@mail.ustc.edu.cn, tytso@mit.edu, viro@zeniv.linux.org.uk, hughd@google.com, hannes@cmpxchg.org On Thu, Feb 10, 2011 at 8:57 AM, Minchan Kim wrote: > On Thu, Feb 10, 2011 at 1:39 AM, Dan Magenheimer > wrote: >> >> >>> From: Minchan Kim [mailto:minchan.kim@gmail.com] >> >>> As I read your comment, I can't find the benefit of zram compared to >>> frontswap. >> >> Well, I am biased, but I agree that frontswap is a better technical >> solution than zram. ;-) =C2=A0But "dynamic-ity" is very important to >> me and may be less important to others. >> >> I thought of these other differences, both technical and >> non-technical: >> >> - Zram is minimally invasive to the swap subsystem, requiring only >> =C2=A0one hook which is already upstream (though see below) and is >> =C2=A0apparently already used by some Linux users. =C2=A0Frontswap is so= mewhat > > Yes. I think what someone is using it is a problem. > >> =C2=A0more invasive and, UNTIL zcache-was-kztmem was posted a few weeks >> =C2=A0ago, had no non-Xen users (though some distros are already shippin= g >> =C2=A0the hooks in their kernels because Xen supports it); as a result, >> =C2=A0frontswap has gotten almost no review by kernel swap subsystem >> =C2=A0experts who I'm guessing weren't interested in anything that >> =C2=A0required Xen to use... hopefully that barrier is now resolved >> =C2=A0(but bottom line is frontswap is not yet upstream). > > That's why I suggested to remove frontswap in this turn. > If any swap experts has a interest, maybe you can't receive any ack or Typo. If any swap experts don't have a interest, --=20 Kind regards, Minchan Kim -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org