From: "Denis V. Lunev" <den@openvz.org>
Cc: Kevin Wolf <kwolf@redhat.com>, Fam Zheng <famz@redhat.com>,
Peter Lieven <pl@kamp.de>,
qemu-devel@nongnu.org, Stefan Hajnoczi <stefanha@redhat.com>,
"Denis V. Lunev" <den@openvz.org>
Subject: [Qemu-devel] [PATCH v4 0/7] eliminate data write in bdrv_write_zeroes on Linux in raw-posix.c
Date: Tue, 27 Jan 2015 16:51:32 +0300 [thread overview]
Message-ID: <1422366699-17473-1-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 of bdrv_write_zeroes
Changes from v3:
- dropped original patch 1, equivalent stuff was merged already
- reordered patches as suggested by Fam
- fixes spelling errors as suggested by Fam
- fixed not initialized value in handle_aiocb_write_zeroes
- fixed wrong error processing from do_fallocate(FALLOC_FL_ZERO_RANGE)
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>
CC: Fam Zheng <famz@redhat.com>
next reply other threads:[~2015-01-27 13:52 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-27 13:51 Denis V. Lunev [this message]
2015-01-27 13:51 ` [Qemu-devel] [PATCH 1/7] block/raw-posix: create translate_err helper to merge errno values Denis V. Lunev
2015-01-27 16:50 ` Max Reitz
2015-01-27 13:51 ` [Qemu-devel] [PATCH 2/7] block/raw-posix: create do_fallocate helper Denis V. Lunev
2015-01-27 16:57 ` Max Reitz
2015-01-27 13:51 ` [Qemu-devel] [PATCH 3/7] block/raw-posix: refactor handle_aiocb_write_zeroes a bit Denis V. Lunev
2015-01-27 17:13 ` Max Reitz
2015-01-27 13:51 ` [Qemu-devel] [PATCH 4/7] block: use fallocate(FALLOC_FL_ZERO_RANGE) in handle_aiocb_write_zeroes Denis V. Lunev
2015-01-27 17:30 ` Max Reitz
2015-01-27 13:51 ` [Qemu-devel] [PATCH 5/7] block: use fallocate(FALLOC_FL_PUNCH_HOLE) & fallocate(0) to write zeroes Denis V. Lunev
2015-01-27 17:48 ` Max Reitz
2015-01-27 13:51 ` [Qemu-devel] [PATCH 6/7] block/raw-posix: call plain fallocate in handle_aiocb_write_zeroes Denis V. Lunev
2015-01-27 17:57 ` Max Reitz
2015-01-27 18:19 ` Denis V. Lunev
2015-01-27 18:24 ` Max Reitz
2015-01-27 18:33 ` Denis V. Lunev
2015-01-27 13:51 ` [Qemu-devel] [PATCH 7/7] block/raw-posix: set max_write_zeroes to INT_MAX for regular files Denis V. Lunev
2015-01-27 18:05 ` Max Reitz
2015-01-27 18:11 ` Denis V. Lunev
2015-01-28 6:39 ` Denis V. Lunev
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