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authorGioh Kim <gi-oh.kim@ionos.com>2021-04-19 10:37:17 +0300
committerJens Axboe <axboe@kernel.dk>2021-04-20 17:59:04 +0300
commit015fcf13c41f5dc06132e96540755fcf3f32e72f (patch)
tree0791ee0489132b1354a50f3f2263774c264565d2
parent2958a995edc94654df690318df7b9b49e5a3ef88 (diff)
downloadlinux-015fcf13c41f5dc06132e96540755fcf3f32e72f.tar.xz
Documentation/ABI/rnbd-clt: Add description for nr_poll_queues
describe how to set nr_poll_queues and enable the polling Signed-off-by: Gioh Kim <gi-oh.kim@ionos.com> Acked-by: Jack Wang <jinpu.wang@cloud.ionos.com> Link: https://lore.kernel.org/r/20210419073722.15351-15-gi-oh.kim@ionos.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
-rw-r--r--Documentation/ABI/testing/sysfs-block-rnbd6
-rw-r--r--Documentation/ABI/testing/sysfs-class-rnbd-client13
2 files changed, 19 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-block-rnbd b/Documentation/ABI/testing/sysfs-block-rnbd
index ec716e1c31a8..80b420b5d6b8 100644
--- a/Documentation/ABI/testing/sysfs-block-rnbd
+++ b/Documentation/ABI/testing/sysfs-block-rnbd
@@ -56,3 +56,9 @@ Date: Feb 2020
KernelVersion: 5.7
Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com>
Description: Remap the disconnected device if the session is not destroyed yet.
+
+What: /sys/block/rnbd<N>/rnbd/nr_poll_queues
+Date: Feb 2020
+KernelVersion: 5.7
+Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com>
+Description: Contains the number of poll-mode queues
diff --git a/Documentation/ABI/testing/sysfs-class-rnbd-client b/Documentation/ABI/testing/sysfs-class-rnbd-client
index 2aa05b3e348e..0b5997ab3365 100644
--- a/Documentation/ABI/testing/sysfs-class-rnbd-client
+++ b/Documentation/ABI/testing/sysfs-class-rnbd-client
@@ -85,6 +85,19 @@ Description: Expected format is the following::
By default "rw" is used.
+ nr_poll_queues
+ specifies the number of poll-mode queues. If the IO has HIPRI flag,
+ the block-layer will send the IO via the poll-mode queue.
+ For fast network and device the polling is faster than interrupt-base
+ IO handling because it saves time for context switching, switching to
+ another process, handling the interrupt and switching back to the
+ issuing process.
+
+ Set -1 if you want to set it as the number of CPUs
+ By default rnbd client creates only irq-mode queues.
+
+ NOTICE: MUST make a unique session for a device using the poll-mode queues.
+
Exit Codes:
If the device is already mapped it will fail with EEXIST. If the input