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cgroup: Also set io.bfq.weight

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Current kernels with BFQ scheduler do not yet set their IO weight
through "io.weight" but through "io.bfq.weight" (using a slightly
different interface supporting only default weights, not per-device
weights). This commit enables "IOWeight=" to just to that.

This patch may be dropped at some time later.

Github-Link: https://github.com/systemd/systemd/issues/7057
Signed-off-by: Kai Krakow <kai@kaishome.de>
This commit is contained in:
Kai Krakow 2019-08-17 02:33:43 +02:00 committed by Lennart Poettering
parent 06e93130b4
commit 2dbc45aea7
2 changed files with 8 additions and 0 deletions
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3
NEWS
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@ -429,6 +429,9 @@ CHANGES WITH 243 in spe:
option that permits selecting the timout how long to wait for a
device with an encryption key before asking for the password.
* IOWeight= has learnt to properly set the IO weight when using the
BFQ scheduler officially found in kernels 5.0+.
Contributions from: Aaron Barany, Adrian Bunk, Alan Jenkins, Andrej
Valek, Anita Zhang, Arian van Putten, Balint Reczey, Bastien Nocera,
Ben Boeckel, Benjamin Robin, camoz, Chen Qi, Chris Chiu, Chris Down,

5
src/core/cgroup.c
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@ -1063,6 +1063,11 @@ static void cgroup_context_apply(
xsprintf(buf, "default %" PRIu64 "\n", weight);
(void) set_attribute_and_warn(u, "io", "io.weight", buf);
/* FIXME: drop this when distro kernels properly support BFQ through "io.weight"
* See also: https://github.com/systemd/systemd/pull/13335 */
xsprintf(buf, "%" PRIu64 "\n", weight);
(void) set_attribute_and_warn(u, "io", "io.bfq.weight", buf);
if (has_io) {
CGroupIODeviceLatency *latency;
CGroupIODeviceLimit *limit;