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update io_uring_enter.2 docs for IORING_FEAT_NODROP

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The EBUSY docs are out of date, so update them for the IORING_FEAT_NODROP
feature flag

Signed-off-by: Dylan Yudaken <dylany@fb.com>
Tested-by: Ammar Faizi <ammarfaizi2@gnuweeb.org> # Build
Link: https://lore.kernel.org/r/20220905132258.1858915-8-dylany@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Dylan Yudaken
2022-09-05 06:22:54 -07:00
committed by Jens Axboe
parent 0689e82366
commit abeb2c28c3
1 changed files with 12 additions and 1 deletions
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man/io_uring_enter.2
+12 -1
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@@ -1330,7 +1330,18 @@ is a valid file descriptor, but the io_uring ring is not in the right state
for details on how to enable the ring.
.TP
.B EBUSY
The application is attempting to overcommit the number of requests it can have
If the
.B IORING_FEAT_NODROP
feature flag is set, then
.B EBUSY
will be returned if there were overflow entries,
.B IORING_ENTER_GETEVENTS
flag is set and not all of the overflow entries were able to be flushed to
the CQ ring.
Without
.B IORING_FEAT_NODROP
the application is attempting to overcommit the number of requests it can have
pending. The application should wait for some completions and try again. May
occur if the application tries to queue more requests than we have room for in
the CQ ring, or if the application attempts to wait for more events without