From mboxrd@z Thu Jan 1 00:00:00 1970 Subject: Re: [patch 1/6] Guest page hinting: core + volatile page cache. In-Reply-To: Your message of "Fri, 11 May 2007 15:58:28 +0200." <20070511135925.513572897@de.ibm.com> From: Valdis.Kletnieks@vt.edu References: <20070511135827.393181482@de.ibm.com> <20070511135925.513572897@de.ibm.com> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="==_Exmh_1178894722_3561P"; micalg=pgp-sha1; protocol="application/pgp-signature" Content-Transfer-Encoding: 7bit Date: Fri, 11 May 2007 10:45:23 -0400 Message-ID: <5056.1178894723@turing-police.cc.vt.edu> Sender: owner-linux-mm@kvack.org Return-Path: To: Martin Schwidefsky Cc: virtualization@lists.osdl.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Zachary Amsden , Andrew Morton , Nick Piggin , Hubertus Franke , Rik van Riel List-ID: --==_Exmh_1178894722_3561P Content-Type: text/plain; charset=us-ascii On Fri, 11 May 2007 15:58:28 +0200, Martin Schwidefsky said: > The guest page hinting patchset introduces code that passes guest > page usage information to the host system that virtualizes the > memory of its guests. There are three different page states: Possibly hiding in the patchset someplace where I don't see it, but IBM's VM hypervisor supported reflecting page faults back to a multitasking guest, giving a signal that the guest supervisor could use. The guest would then look up which process owned that virtual page, and could elect to flag that process as in page-wait and schedule another process to run while the hypervisor was doing the I/O to bring the page in. The guest would then get another interrupt when the page became available, which it could use to flag the suspended process as eligible for scheduling again. Not sure how that would fit into all this though - it looks like the "discard fault" does something similar, but only for pages marked volatile. Would it be useful/helpful to also deliver a similar signal for stable pages? --==_Exmh_1178894722_3561P Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (GNU/Linux) Comment: Exmh version 2.5 07/13/2001 iD8DBQFGRIGCcC3lWbTT17ARAuXpAKC7e3qFghXxkxTjGCVCOv8qFgPu9gCeN7+P PCU5D+jRQTaPWNGBK3kJsKo= =wU0V -----END PGP SIGNATURE----- --==_Exmh_1178894722_3561P-- -- 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