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dm writecache: add event counters

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Add 10 counters for various events (hit, miss, etc) and export them in
the status line (accessed from userspace with "dmsetup status"). Also
add a message "clear_stats" that resets these counters.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mikulas Patocka
2021-07-27 09:42:21 -04:00
committed by Mike Snitzer
parent df699cc16e
commit e3a35d0340
2 changed files with 67 additions and 5 deletions
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16
Documentation/admin-guide/device-mapper/writecache.rst
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@@ -78,13 +78,23 @@ Status:
2. the number of blocks
3. the number of free blocks
4. the number of blocks under writeback
5. the number of read requests
6. the number of read requests that hit the cache
7. the number of write requests
8. the number of write requests that hit uncommitted block
9. the number of write requests that hit committed block
10. the number of write requests that bypass the cache
11. the number of write requests that are allocated in the cache
12. the number of write requests that are blocked on the freelist
13. the number of flush requests
14. the number of discard requests
Messages:
flush
flush the cache device. The message returns successfully
Flush the cache device. The message returns successfully
if the cache device was flushed without an error
flush_on_suspend
flush the cache device on next suspend. Use this message
Flush the cache device on next suspend. Use this message
when you are going to remove the cache device. The proper
sequence for removing the cache device is:
@@ -98,3 +108,5 @@ Messages:
6. the cache device is now inactive and it can be deleted
cleaner
See above "cleaner" constructor documentation.
clear_stats
Clear the statistics that are reported on the status line