From: "Denis V. Lunev" <den@openvz.org>
Cc: Kevin Wolf <kwolf@redhat.com>, "Denis V. Lunev" <den@openvz.org>,
Peter Lieven <pl@kamp.de>,
qemu-devel@nongnu.org, Stefan Hajnoczi <stefanha@redhat.com>
Subject: [Qemu-devel] [PATCH v3 0/8] eliminate data write in bdrv_write_zeroes on Linux in raw-posix.c
Date: Tue, 30 Dec 2014 12:20:42 +0300 [thread overview]
Message-ID: <1419931250-19259-1-git-send-email-den@openvz.org> (raw)
These patches eliminate data writes completely on Linux if fallocate
FALLOC_FL_ZERO_RANGE or FALLOC_FL_PUNCH_HOLE are supported on
underlying filesystem.
I have performed several tests with non-aligned fallocate calls and
in all cases (with non-aligned fallocates) Linux performs fine, i.e.
areas are zeroed correctly. Checks were made on
Linux 3.16.0-28-generic #38-Ubuntu SMP
This should seriously increase performance in some special cases.
Changes from v2:
- added Peter Lieven to CC
- added CONFIG_FALLOCATE check to call do_fallocate in patch 7
- dropped patch 1 as NACK-ed
- added processing of very large data areas in bdrv_co_write_zeroes (new
patch 1)
- set bl.max_write_zeroes to INT_MAX in raw-posix.c for regular files
(new patch 8)
Signed-off-by: Denis V. Lunev <den@openvz.org>
CC: Kevin Wolf <kwolf@redhat.com>
CC: Stefan Hajnoczi <stefanha@redhat.com>
CC: Peter Lieven <pl@kamp.de>
next reply other threads:[~2014-12-30 9:21 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-30 9:20 Denis V. Lunev [this message]
2014-12-30 9:20 ` [Qemu-devel] [PATCH 1/8] block: prepare bdrv_co_do_write_zeroes to deal with large bl.max_write_zeroes Denis V. Lunev
2015-01-05 7:34 ` Peter Lieven
2015-01-05 11:06 ` Denis V. Lunev
2015-01-05 11:23 ` Peter Lieven
2015-01-05 11:48 ` Denis V. Lunev
2015-01-05 12:26 ` [Qemu-devel] [PATCH v2 1/1] " Denis V. Lunev
2015-01-05 12:32 ` [Qemu-devel] [PATCH v3 " Denis V. Lunev
2014-12-30 9:20 ` [Qemu-devel] [PATCH 2/8] block: use fallocate(FALLOC_FL_ZERO_RANGE) in handle_aiocb_write_zeroes Denis V. Lunev
2014-12-30 9:20 ` [Qemu-devel] [PATCH 3/8] block/raw-posix: create do_fallocate helper Denis V. Lunev
2014-12-30 9:20 ` [Qemu-devel] [PATCH 4/8] block/raw-posix: create translate_err helper to merge errno values Denis V. Lunev
2015-01-05 6:46 ` Fam Zheng
2015-01-05 11:17 ` Denis V. Lunev
2014-12-30 9:20 ` [Qemu-devel] [PATCH 5/8] block/raw-posix: refactor handle_aiocb_write_zeroes a bit Denis V. Lunev
2015-01-05 6:57 ` Fam Zheng
2015-01-05 11:07 ` Denis V. Lunev
2014-12-30 9:20 ` [Qemu-devel] [PATCH 6/8] block: use fallocate(FALLOC_FL_PUNCH_HOLE) & fallocate(0) to write zeroes Denis V. Lunev
2015-01-05 7:02 ` Fam Zheng
2015-01-05 11:14 ` Denis V. Lunev
2014-12-30 9:20 ` [Qemu-devel] [PATCH 7/8] block/raw-posix: call plain fallocate in handle_aiocb_write_zeroes Denis V. Lunev
2014-12-30 9:20 ` [Qemu-devel] [PATCH 8/8] block/raw-posix: set max_write_zeroes to INT_MAX for regular files Denis V. Lunev
2014-12-30 10:55 ` [Qemu-devel] [PATCH v3 0/8] eliminate data write in bdrv_write_zeroes on Linux in raw-posix.c Peter Lieven
2014-12-30 11:07 ` Denis V. Lunev
2015-01-05 6:55 ` Peter Lieven
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