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author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2019-11-26 11:06:19 -0300 |
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committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2019-11-26 11:06:19 -0300 |
commit | 2ea352d5960ad469f5712cf3e293db97beac4e01 (patch) | |
tree | c24ae19073f2884867b310ee193d36a82075b60f /Documentation/admin-guide/iostats.rst | |
parent | Merge branch 'x86/core' into perf/core, to resolve conflicts and to pick up completed topic tree (diff) | |
parent | Merge tag 'for-linus-5.5-1' of git://github.com/cminyard/linux-ipmi (diff) | |
download | linux-dev-2ea352d5960ad469f5712cf3e293db97beac4e01.tar.xz linux-dev-2ea352d5960ad469f5712cf3e293db97beac4e01.zip |
Merge remote-tracking branch 'torvalds/master' into perf/core
To pick up BPF changes we'll need.
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'Documentation/admin-guide/iostats.rst')
-rw-r--r-- | Documentation/admin-guide/iostats.rst | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/admin-guide/iostats.rst b/Documentation/admin-guide/iostats.rst index 5d63b18bd6d1..4f0462af3ca7 100644 --- a/Documentation/admin-guide/iostats.rst +++ b/Documentation/admin-guide/iostats.rst @@ -121,6 +121,15 @@ Field 15 -- # of milliseconds spent discarding This is the total number of milliseconds spent by all discards (as measured from __make_request() to end_that_request_last()). +Field 16 -- # of flush requests completed + This is the total number of flush requests completed successfully. + + Block layer combines flush requests and executes at most one at a time. + This counts flush requests executed by disk. Not tracked for partitions. + +Field 17 -- # of milliseconds spent flushing + This is the total number of milliseconds spent by all flush requests. + To avoid introducing performance bottlenecks, no locks are held while modifying these counters. This implies that minor inaccuracies may be introduced when changes collide, so (for instance) adding up all the |