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| author | Stefan Metzmacher <metze@samba.org> | 2022-10-27 20:34:45 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-11-21 07:38:31 -0700 |
| commit | e307e6698165ca6508ed42c69cb1be76c8eb6a3c (patch) | |
| tree | b64446ab77a5a0245f03be100af3ba00095cbcde /io_uring/notif.h | |
| parent | eb7081409f94a9a8608593d0fb63a1aa3d6f95d8 (diff) | |
| download | linux-e307e6698165ca6508ed42c69cb1be76c8eb6a3c.tar.gz linux-e307e6698165ca6508ed42c69cb1be76c8eb6a3c.tar.bz2 linux-e307e6698165ca6508ed42c69cb1be76c8eb6a3c.zip | |
io_uring/net: introduce IORING_SEND_ZC_REPORT_USAGE flag
It might be useful for applications to detect if a zero copy transfer with
SEND[MSG]_ZC was actually possible or not. The application can fallback to
plain SEND[MSG] in order to avoid the overhead of two cqes per request. Or
it can generate a log message that could indicate to an administrator that
no zero copy was possible and could explain degraded performance.
Cc: stable@vger.kernel.org # 6.1
Link: https://lore.kernel.org/io-uring/fb6a7599-8a9b-15e5-9b64-6cd9d01c6ff4@gmail.com/T/#m2b0d9df94ce43b0e69e6c089bdff0ce6babbdfaa
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/8945b01756d902f5d5b0667f20b957ad3f742e5e.1666895626.git.metze@samba.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'io_uring/notif.h')
| -rw-r--r-- | io_uring/notif.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/io_uring/notif.h b/io_uring/notif.h index 5b4d710c8ca5..4ae696273c78 100644 --- a/io_uring/notif.h +++ b/io_uring/notif.h @@ -13,6 +13,9 @@ struct io_notif_data { struct file *file; struct ubuf_info uarg; unsigned long account_pages; + bool zc_report; + bool zc_used; + bool zc_copied; }; void io_notif_flush(struct io_kiocb *notif); |