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| author | Juergen Gross <jgross@suse.com> | 2021-08-27 15:32:06 +0300 |
|---|---|---|
| committer | Juergen Gross <jgross@suse.com> | 2021-09-14 10:53:48 +0300 |
| commit | 8480ed9c2bbd56fc86524998e5f2e3e22f5038f6 (patch) | |
| tree | 0436a0f5f79f1ae51e6816d13443b67bb5e54477 /Documentation/powerpc/elfnote.rst | |
| parent | 58e636039b512697554b579c2bb23774061877f5 (diff) | |
| download | linux-8480ed9c2bbd56fc86524998e5f2e3e22f5038f6.tar.xz | |
xen/balloon: use a kernel thread instead a workqueue
Today the Xen ballooning is done via delayed work in a workqueue. This
might result in workqueue hangups being reported in case of large
amounts of memory are being ballooned in one go (here 16GB):
BUG: workqueue lockup - pool cpus=6 node=0 flags=0x0 nice=0 stuck for 64s!
Showing busy workqueues and worker pools:
workqueue events: flags=0x0
pwq 12: cpus=6 node=0 flags=0x0 nice=0 active=2/256 refcnt=3
in-flight: 229:balloon_process
pending: cache_reap
workqueue events_freezable_power_: flags=0x84
pwq 12: cpus=6 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
pending: disk_events_workfn
workqueue mm_percpu_wq: flags=0x8
pwq 12: cpus=6 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
pending: vmstat_update
pool 12: cpus=6 node=0 flags=0x0 nice=0 hung=64s workers=3 idle: 2222 43
This can easily be avoided by using a dedicated kernel thread for doing
the ballooning work.
Reported-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Link: https://lore.kernel.org/r/20210827123206.15429-1-jgross@suse.com
Signed-off-by: Juergen Gross <jgross@suse.com>
Diffstat (limited to 'Documentation/powerpc/elfnote.rst')
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