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| author | NeilBrown <neilb@suse.com> | 2016-11-14 16:30:21 +1100 |
|---|---|---|
| committer | Shaohua Li <shli@fb.com> | 2016-11-18 09:34:45 -0800 |
| commit | 581dbd94da80c845b28666716e30c22c0834756a (patch) | |
| tree | 2659c3a8eaa694c1eeaead8ce266aae51c0672f6 /drivers/md/bitmap.c | |
| parent | 109e37653033a5fcd3bf8cab0ed6a7ff433f758a (diff) | |
| download | linux-stable-581dbd94da80c845b28666716e30c22c0834756a.tar.gz linux-stable-581dbd94da80c845b28666716e30c22c0834756a.tar.bz2 linux-stable-581dbd94da80c845b28666716e30c22c0834756a.zip | |
md/bitmap: add blktrace event for writes to the bitmap
We trace wheneven bitmap_unplug() finds that it needs to write
to the bitmap, or when bitmap_daemon_work() find there is work
to do.
This makes it easier to correlate bitmap updates with data writes.
Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Diffstat (limited to 'drivers/md/bitmap.c')
| -rw-r--r-- | drivers/md/bitmap.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c index 1a7f402b79ba..cf77cbf9ed22 100644 --- a/drivers/md/bitmap.c +++ b/drivers/md/bitmap.c @@ -27,6 +27,7 @@ #include <linux/mount.h> #include <linux/buffer_head.h> #include <linux/seq_file.h> +#include <trace/events/block.h> #include "md.h" #include "bitmap.h" @@ -1008,8 +1009,12 @@ void bitmap_unplug(struct bitmap *bitmap) need_write = test_and_clear_page_attr(bitmap, i, BITMAP_PAGE_NEEDWRITE); if (dirty || need_write) { - if (!writing) + if (!writing) { bitmap_wait_writes(bitmap); + if (bitmap->mddev->queue) + blk_add_trace_msg(bitmap->mddev->queue, + "md bitmap_unplug"); + } clear_page_attr(bitmap, i, BITMAP_PAGE_PENDING); write_page(bitmap, bitmap->storage.filemap[i], 0); writing = 1; @@ -1234,6 +1239,10 @@ void bitmap_daemon_work(struct mddev *mddev) } bitmap->allclean = 1; + if (bitmap->mddev->queue) + blk_add_trace_msg(bitmap->mddev->queue, + "md bitmap_daemon_work"); + /* Any file-page which is PENDING now needs to be written. * So set NEEDWRITE now, then after we make any last-minute changes * we will write it. |