Fork of alistair23 Linux kernel for reMarkable from https://github.com/alistair23/linux
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During the process of writeback, the blocks, which have been placed in wbl.list for writeback soon, are partially ordered for the contiguous ones. When writeback_all has been set, for most cases, also by default, there will be a lot of blocks in pmem need to writeback at the same time. For this case, we could optimize the performance by sorting all blocks in wbl.list. writecache_writeback doesn't need to get blocks from the tail of wc->lru, whereas from the first rb_node from the rb_tree. The benefit is that, writecache_writeback doesn't need to have any cost to sort the blocks, because of all blocks are incremental originally in rb_tree. There will be a writecache_flush when writeback_all begins to work, that will eliminate duplicate blocks in cache by committed/uncommitted. Testing platform: Thinksystem SR630 with persistent memory. The cache comes from pmem, which has 1006MB size. The origin device is HDD, 2GB of which for using. Testing steps: 1) dmsetup create mycache --table '0 4194304 writecache p /dev/sdb1 /dev/pmem4 4096 0' 2) fio -filename=/dev/mapper/mycache -direct=1 -iodepth=20 -rw=randwrite -ioengine=libaio -bs=4k -loops=1 -size=2g -group_reporting -name=mytest1 3) time dmsetup message /dev/mapper/mycache 0 flush Here is the results below, With the patch: # fio -filename=/dev/mapper/mycache -direct=1 -iodepth=20 -rw=randwrite -ioengine=libaio -bs=4k -loops=1 -size=2g -group_reporting -name=mytest1 iops : min= 1582, max=199470, avg=5305.94, stdev=21273.44, samples=197 # time dmsetup message /dev/mapper/mycache 0 flush real 0m44.020s user 0m0.002s sys 0m0.003s Without the patch: # fio -filename=/dev/mapper/mycache -direct=1 -iodepth=20 -rw=randwrite -ioengine=libaio -bs=4k -loops=1 -size=2g -group_reporting -name=mytest1 iops : min= 1202, max=197650, avg=4968.67, stdev=20480.17, samples=211 # time dmsetup message /dev/mapper/mycache 0 flush real 1m39.221s user 0m0.001s sys 0m0.003s I also have checked the data accuracy with this patch by making EXT4 filesystem on mycache, then mount it for checking md5 of files on that. The test result is positive, with this patch it could save more than half of time when writeback_all. Signed-off-by: Huaisheng Ye <yehs1@lenovo.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> |
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README
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.