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From 4e589237979fdf90af38d466abd7fcd852356f02 Mon Sep 17 00:00:00 2001
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From: Kai Krakow <kai@kaishome.de>
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Date: Sat, 17 Aug 2019 02:33:43 +0200
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Subject: [PATCH] cgroup: Also set io.bfq.weight
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Current kernels with BFQ scheduler do not yet set their IO weight
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through "io.weight" but through "io.bfq.weight" (using a slightly
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different interface supporting only default weights, not per-device
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weights). This commit enables "IOWeight=" to just to that.
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This patch may be dropped at some time later.
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Github-Link: https://github.com/systemd/systemd/issues/7057
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Signed-off-by: Kai Krakow <kai@kaishome.de>
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(cherry picked from commit 21221ce1ce9a572e82d46d80692afd65c224fc50)
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Related: #1927290
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---
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src/core/cgroup.c | 8 ++++++++
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1 file changed, 8 insertions(+)
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diff --git a/src/core/cgroup.c b/src/core/cgroup.c
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index 71e30fd4db..f02cc31c6e 100644
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--- a/src/core/cgroup.c
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+++ b/src/core/cgroup.c
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@@ -984,6 +984,14 @@ static void cgroup_context_apply(
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log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
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"Failed to set io.weight: %m");
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+ /* FIXME: drop this when distro kernels properly support BFQ through "io.weight"
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+ * See also: https://github.com/systemd/systemd/pull/13335 */
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+ xsprintf(buf, "%" PRIu64 "\n", weight);
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+ r = cg_set_attribute("io", path, "io.bfq.weight", buf);
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+ if (r < 0)
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+ log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
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+ "Failed to set io.bfq.weight: %m");
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+
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if (has_io) {
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CGroupIODeviceWeight *w;
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