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[for-rc,19/24] Documentation/ABI/rnbd-clt: Add description for nr_poll_queues

Message ID 20210325152911.1213627-20-gi-oh.kim@ionos.com (mailing list archive)
State New, archived
Headers show
Series Misc update for rnbd | expand

Commit Message

Gioh Kim March 25, 2021, 3:29 p.m. UTC 
describe how to set nr_poll_queues and enable the polling

Signed-off-by: Gioh Kim <gi-oh.kim@ionos.com>
---
 Documentation/ABI/testing/sysfs-block-rnbd        |  6 ++++++
 Documentation/ABI/testing/sysfs-class-rnbd-client | 13 +++++++++++++
 2 files changed, 19 insertions(+)
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Patch

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