From: Gioh Kim Date: Mon, 19 Apr 2021 07:37:17 +0000 (+0200) Subject: Documentation/ABI/rnbd-clt: Add description for nr_poll_queues X-Git-Tag: v5.15~1258^2~13 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=015fcf13c41f5dc06132e96540755fcf3f32e72f;p=platform%2Fkernel%2Flinux-starfive.git 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 Acked-by: Jack Wang Link: https://lore.kernel.org/r/20210419073722.15351-15-gi-oh.kim@ionos.com Signed-off-by: Jens Axboe --- diff --git a/Documentation/ABI/testing/sysfs-block-rnbd b/Documentation/ABI/testing/sysfs-block-rnbd index ec716e1..80b420b 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 Danil Kipnis Description: Remap the disconnected device if the session is not destroyed yet. + +What: /sys/block/rnbd/rnbd/nr_poll_queues +Date: Feb 2020 +KernelVersion: 5.7 +Contact: Jack Wang Danil Kipnis +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 2aa05b3..0b5997a 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