md: introduce a new struct for IO serialization

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Obviously, IO serialization could cause the degradation of
performance a lot. In order to reduce the degradation, so a
rb interval tree is added in raid1 to speed up the check of
collision.

So, a rb root is needed in md_rdev, then abstract all the
serialize related members to a new struct (serial_in_rdev),
embed it into md_rdev.

Of course, we need to free the struct if it is not needed
anymore, so rdev/rdevs_uninit_serial are added accordingly.
And they should be called when destroty memory pool or can't
alloc memory.

And we need to consider to call mddev_destroy_serial_pool
in case serialize_policy/write-behind is disabled, bitmap
is destroyed or in __md_stop_writes.

Signed-off-by: Guoqing Jiang <guoqing.jiang@cloud.ionos.com>
Signed-off-by: Song Liu <songliubraving@fb.com>

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This commit is contained in:

Guoqing Jiang 2019-12-23 10:49:00 +01:00 • committed by Song Liu

parent 4d26d32fe4

commit 69b00b5bb2

4 changed files with 116 additions and 63 deletions

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12

drivers/md/md-bitmap.c

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84

drivers/md/md.c

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26

drivers/md/md.h

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59

drivers/md/raid1.c

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