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From af9f03ba48dd75be8c6a923f70da9804b3a3a2c3 Mon Sep 17 00:00:00 2001
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From: Pavel Hrdina <phrdina@redhat.com>
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Date: Wed, 25 Nov 2020 09:05:36 +0100
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Subject: [PATCH] cgroup: Also set blkio.bfq.weight
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Commit [1] added a workaround when unified cgroups are used but missed
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legacy cgroups where there is the same issue.
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[1] <https://github.com/systemd/systemd/commit/2dbc45aea747f25cc1c3848fded2ec0062f96bcf>
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Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
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(cherry picked from commit 35e7a62ca32a30169a94693b831e53c832251984)
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Resolves: #1657810
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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 f1ce070f9a..71e30fd4db 100644
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--- a/src/core/cgroup.c
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+++ b/src/core/cgroup.c
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@@ -1063,6 +1063,14 @@ 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 blkio.weight: %m");
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+ /* FIXME: drop this when distro kernels properly support BFQ through "blkio.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("blkio", path, "blkio.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 blkio.bfq.weight: %m");
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+
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if (has_io) {
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CGroupIODeviceWeight *w;
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