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systemd/SOURCES/0567-cgroup-Also-set-io.bfq...

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1.8 KiB

From 4e589237979fdf90af38d466abd7fcd852356f02 Mon Sep 17 00:00:00 2001
From: Kai Krakow <kai@kaishome.de>
Date: Sat, 17 Aug 2019 02:33:43 +0200
Subject: [PATCH] cgroup: Also set io.bfq.weight
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>
(cherry picked from commit 21221ce1ce9a572e82d46d80692afd65c224fc50)
Related: #1927290
---
src/core/cgroup.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/src/core/cgroup.c b/src/core/cgroup.c
index 71e30fd4db..f02cc31c6e 100644
--- a/src/core/cgroup.c
+++ b/src/core/cgroup.c
@@ -984,6 +984,14 @@ static void cgroup_context_apply(
log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
"Failed to set io.weight: %m");
+ /* 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);
+ r = cg_set_attribute("io", path, "io.bfq.weight", buf);
+ if (r < 0)
+ log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
+ "Failed to set io.bfq.weight: %m");
+
if (has_io) {
CGroupIODeviceWeight *w;