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Red Hat Bugzilla – Attachment 1983225 Details for
Bug 2222603
[upstream][kvm] Patch "vhost: use vhost_tasks for worker threads" introduces 30% performance degradation
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[patch]
Don't inherit parent's sched settings
reset-sched.patch (text/plain), 773 bytes, created by
Mike Christie
on 2023-08-14 01:08:39 UTC
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Description:
Don't inherit parent's sched settings
Filename:
MIME Type:
Creator:
Mike Christie
Created:
2023-08-14 01:08:39 UTC
Size:
773 bytes
patch
obsolete
>diff --git a/kernel/vhost_task.c b/kernel/vhost_task.c >index da35e5b7f047..f2c2638d1106 100644 >--- a/kernel/vhost_task.c >+++ b/kernel/vhost_task.c >@@ -2,6 +2,7 @@ > /* > * Copyright (C) 2021 Oracle Corporation > */ >+#include <uapi/linux/sched/types.h> > #include <linux/slab.h> > #include <linux/completion.h> > #include <linux/sched/task.h> >@@ -22,9 +23,16 @@ struct vhost_task { > > static int vhost_task_fn(void *data) > { >+ static const struct sched_param param = { .sched_priority = 0 }; > struct vhost_task *vtsk = data; > bool dead = false; > >+ /* >+ * Don't inherit the parent's sched info, so we maintain compat from >+ * when we used kthreads and it reset this info. >+ */ >+ sched_setscheduler_nocheck(current, SCHED_NORMAL, ¶m); >+ > for (;;) { > bool did_work; >
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