From: Song Liu <songliubraving@fb.com>
To: linux-raid@vger.kernel.org
Cc: neilb@suse.com, shli@fb.com, kernel-team@fb.com,
dan.j.williams@intel.com, hch@infradead.org,
liuzhengyuang521@gmail.com, liuzhengyuan@kylinos.cn,
Song Liu <songliubraving@fb.com>
Subject: [PATCH v3 0/8] raid5-cache: enabling cache features
Date: Thu, 6 Oct 2016 00:14:08 -0700 [thread overview]
Message-ID: <20161006071416.3295093-1-songliubraving@fb.com> (raw)
These are the 3rd version of patches to enable write cache part of
raid5-cache. The journal part was released with kernel 4.4.
The caching part uses same disk format of raid456 journal, and provides
acceleration to writes. Write operations are committed (bio_endio) once
the data is secured in journal. Reconstruct and RMW are postponed to
reclaim path, which is (hopefully) not on the critical path.
The changes are organized in 8 patches (details below).
Patch for chunk_aligned_read in earlier RFC is not included yet
(http://marc.info/?l=linux-raid&m=146432700719277). But we may still need
some optimizations later, especially for SSD raid devices.
Changes from PATCH v2 (http://marc.info/?l=linux-raid&m=147493266208102):
1. Incorporate feedback from Shaohua
2. Reorganize the patches, for hopefully easier review
3. Make sure no change to write through mode (journal only)
4. Change reclaim design to avoid deadlock due to log space
Thanks,
Song
Song Liu (8):
md/r5cache: Check array size in r5l_init_log
md/r5cache: move some code to raid5.h
md/r5cache: State machine for raid5-cache write back mode
md/r5cache: write part of r5cache
md/r5cache: reclaim support
md/r5cache: sysfs entry r5c_state
md/r5cache: r5c recovery
md/r5cache: handle SYNC and FUA
drivers/md/raid5-cache.c | 1597 ++++++++++++++++++++++++++++++++++++++++------
drivers/md/raid5.c | 258 +++++---
drivers/md/raid5.h | 150 ++++-
3 files changed, 1712 insertions(+), 293 deletions(-)
--
2.9.3
next reply other threads:[~2016-10-06 7:14 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-06 7:14 Song Liu [this message]
2016-10-06 7:14 ` [PATCH v3 1/8] md/r5cache: Check array size in r5l_init_log Song Liu
2016-10-06 7:14 ` [PATCH v3 2/8] md/r5cache: move some code to raid5.h Song Liu
2016-10-06 7:14 ` [PATCH v3 3/8] md/r5cache: State machine for raid5-cache write back mode Song Liu
2016-10-06 7:14 ` [PATCH v3 4/8] md/r5cache: write part of r5cache Song Liu
2016-10-06 7:14 ` [PATCH v3 5/8] md/r5cache: reclaim support Song Liu
2016-10-06 7:14 ` [PATCH v3 6/8] md/r5cache: sysfs entry r5c_state Song Liu
2016-10-06 7:14 ` [PATCH v3 7/8] md/r5cache: r5c recovery Song Liu
2016-10-06 7:14 ` [PATCH v3 8/8] md/r5cache: handle SYNC and FUA Song Liu
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