Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965235AbbGVOPK (ORCPT ); Wed, 22 Jul 2015 10:15:10 -0400 Received: from prod-mail-xrelay02.akamai.com ([72.246.2.14]:45282 "EHLO prod-mail-xrelay02.akamai.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965275AbbGVOPD (ORCPT ); Wed, 22 Jul 2015 10:15:03 -0400 Date: Wed, 22 Jul 2015 10:15:01 -0400 From: Eric B Munson To: Michael Ellerman Cc: Andrew Morton , linux-mips@linux-mips.org, linux-m68k@vger.kernel.org, linux-ia64@vger.kernel.org, linux-sh@vger.kernel.org, Catalin Marinas , Heiko Carstens , Michal Hocko , linux-mm@kvack.org, sparclinux@vger.kernel.org, linux-arch@vger.kernel.org, Stephen Rothwell , linux-am33-list@redhat.com, Geert Uytterhoeven , Vlastimil Babka , Guenter Roeck , linux-xtensa@linux-xtensa.org, linux-s390@vger.kernel.org, adi-buildroot-devel@lists.sourceforge.net, linux-arm-kernel@lists.infradead.org, linux-cris-kernel@axis.com, linux-parisc@vger.kernel.org, linux-api@vger.kernel.org, linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Subject: Re: [PATCH V4 2/6] mm: mlock: Add new mlock, munlock, and munlockall system calls Message-ID: <20150722141501.GA3203@akamai.com> References: <1437508781-28655-1-git-send-email-emunson@akamai.com> <1437508781-28655-3-git-send-email-emunson@akamai.com> <20150721134441.d69e4e1099bd43e56835b3c5@linux-foundation.org> <1437528316.16792.7.camel@ellerman.id.au> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="opJtzjQTFsWo+cga" Content-Disposition: inline In-Reply-To: <1437528316.16792.7.camel@ellerman.id.au> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2687 Lines: 69 --opJtzjQTFsWo+cga Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, 22 Jul 2015, Michael Ellerman wrote: > On Tue, 2015-07-21 at 13:44 -0700, Andrew Morton wrote: > > On Tue, 21 Jul 2015 15:59:37 -0400 Eric B Munson w= rote: > >=20 > > > With the refactored mlock code, introduce new system calls for mlock, > > > munlock, and munlockall. The new calls will allow the user to specify > > > what lock states are being added or cleared. mlock2 and munlock2 are > > > trivial at the moment, but a follow on patch will add a new mlock sta= te > > > making them useful. > > >=20 > > > munlock2 addresses a limitation of the current implementation. If a > > > user calls mlockall(MCL_CURRENT | MCL_FUTURE) and then later decides > > > that MCL_FUTURE should be removed, they would have to call munlockall= () > > > followed by mlockall(MCL_CURRENT) which could potentially be very > > > expensive. The new munlockall2 system call allows a user to simply > > > clear the MCL_FUTURE flag. > >=20 > > This is hard. Maybe we shouldn't have wired up anything other than > > x86. That's what we usually do with new syscalls. >=20 > Yeah I think so. >=20 > You haven't wired it up properly on powerpc, but I haven't mentioned it b= ecause > I'd rather we did it. >=20 > cheers It looks like I will be spinning a V5, so I will drop all but the x86 system calls additions in that version. --opJtzjQTFsWo+cga Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAEBAgAGBQJVr6VlAAoJELbVsDOpoOa95lcP/09wvimQwXtTG/OgMLsgEPaz FVL4uSMeiSaPdcdYp1Qp+ie80X/Ve92le8uJ9pcRKV3+cK2xP8OiOQQQwz57cBU8 MIzkJPycm2gww6DRwYVjXhUJH2FMb1KK1vQALVWwh0mUAkRvpi4T7mtxSzmRUD+V TEw4dIBmK3dEorWA7duy9L/8juLu/j2kd3GzFnd5vp7q5HDb+tJrBD+I1jos2dlQ KqYzU5vCmPC11pc2TzzFkXx6hGux1Rj4y/7jUMID14Hi+Ql0dQGwMo6kcMmdxS+P kULToMPhnlDZIAfNOpfanHUsnzLPy4UVJ2ecYHXte7Yj4uxU9NXf6Dli47/iZK4H lp+MUwmXEQsoQTqwUWO36Hcpu5aKHQzbmz3qeNwLe37ZauHahT7GSYR8ZrntQo2v oQs9zdeLt2enFwC0QSubvRtIAEbpvnWvup0lD89fEFMubri6IFKFFMuSIr9kNBS0 6jcxjzbH03cDgnrlAEb0k54nblsgCRoagmHpqZH+TzAKlLqUXpIeqVUnkjXrclkg XBlxVwh2m0LvFFWnTZ/AoXmZif91GBNQw+ZPkju+iRs8r3YtjH3Pv2aZL4tjDFzA /Gyv+WSvZ3NjakBejr+qzZiET/MSEmX1agUJo/2sd0QUL/z0Jk1gConPgmjaoFCO UoTgStn2fZdwMTcy6Lyt =nv7P -----END PGP SIGNATURE----- --opJtzjQTFsWo+cga-- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/