From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx110.postini.com [74.125.245.110]) by kanga.kvack.org (Postfix) with SMTP id 475A96B0068 for ; Tue, 25 Sep 2012 10:26:35 -0400 (EDT) Date: Tue, 25 Sep 2012 17:27:03 +0300 From: "Kirill A. Shutemov" Subject: Re: [PATCH v4 0/8] Avoid cache trashing on clearing huge/gigantic page Message-ID: <20120925142703.GA1598@otc-wbsnb-06> References: <1345470757-12005-1-git-send-email-kirill.shutemov@linux.intel.com> <20120913160506.d394392a.akpm@linux-foundation.org> <20120914055210.GC9043@gmail.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="k+w/mQv8wyuph6w0" Content-Disposition: inline In-Reply-To: <20120914055210.GC9043@gmail.com> Sender: owner-linux-mm@kvack.org List-ID: To: Ingo Molnar Cc: Andrew Morton , linux-mm@kvack.org, Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , x86@kernel.org, Andi Kleen , Tim Chen , Alex Shi , Jan Beulich , Robert Richter , Andy Lutomirski , Andrea Arcangeli , Johannes Weiner , Hugh Dickins , KAMEZAWA Hiroyuki , Mel Gorman , linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-mips@linux-mips.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org --k+w/mQv8wyuph6w0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Sep 14, 2012 at 07:52:10AM +0200, Ingo Molnar wrote: > Without repeatable hard numbers such code just gets into the=20 > kernel and bitrots there as new CPU generations come in - a few=20 > years down the line the original decisions often degrade to pure=20 > noise. We've been there, we've done that, we don't want to=20 > repeat it. Hard numbers are hard. I've checked some workloads: Mosbench, NPB, specjvm2008. Most of time the patchset doesn't show any difference (within run-to-run deviation). On NPB it recovers THP regression, but it's probably not enough to make decision. It would be nice if somebody test the patchset on other system or workload. Especially, if the configuration shows regression with THP enabled. --=20 Kirill A. Shutemov --k+w/mQv8wyuph6w0 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQIcBAEBAgAGBQJQYb83AAoJEAd+omnVudOMEiwP/jY2gXW39BINUmG8+U4etfX4 vth8c0cn2Gd3F/plJzx2R/HI8qeTaIJeJdEPDuYyaGHEYXNsuVI8mWSbFVTBobag CjkmAGB39F7dPATNxsC5doX+Br+D9/ITvTsPK2unQzq1GX5XL8Gtr72yIq/OYagC 0o+gKCtO6D2GPd7TwD6oxCoPYZwnoAWrNP+1QK2bgm0582AMpJxA/FIJ9EyGLIGX wrrajcBx/RTdNX400jEkNnVPdHCRd5EPED1qpa6Bnx90wFk7YDdSmC9eqdov/GnR 0Rqk7tpnNvPzBb9dpFE2p422RDTrgCA223iLO35Mta7/0+zzwPUYr1wskqY7Jn5U mahxDSTwzqH6lFoal/eOtv+zj6dojOLHq7xDsCg2FjYDgvwgXrk28uDBUnhld0W+ BjQXEf7g4LRAbgHaaW8tM5QhKsxJUCbzVmxvjgsWjChWQF6eiUXIHrEguvtH/3h6 5SU1amCxJoSVtcHS84yOBWnTY7DbzRyXr9qV+PQ4BgXMCWtC51Q7jI8G6mVOiyYV vWTPJkHQOyxo+HObIAqYAOqj1OUuasLS1kFwT/sd6S6+sBbOC4NVeY//IlKPAqfe JlHej7XaFDphiYgPlKUPP409dufRqXxRwA5ac/pCt24FH2wmuDo3x1UR5MjJefTB AOawqDSExew3gFgwKuh1 =8QRo -----END PGP SIGNATURE----- --k+w/mQv8wyuph6w0-- -- 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/ . Don't email: email@kvack.org