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authorJohannes Weiner <hannes@cmpxchg.org>2018-10-27 00:06:31 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2018-10-27 01:26:32 +0200
commit2ce7135adc9ad081aa3c49744144376ac74fea60 (patch)
tree991e01428febe956b2b9a7f94aa835f20c754f2e /init
parentpsi: pressure stall information for CPU, memory, and IO (diff)
downloadlinux-2ce7135adc9ad081aa3c49744144376ac74fea60.tar.xz
linux-2ce7135adc9ad081aa3c49744144376ac74fea60.zip
psi: cgroup support
On a system that executes multiple cgrouped jobs and independent workloads, we don't just care about the health of the overall system, but also that of individual jobs, so that we can ensure individual job health, fairness between jobs, or prioritize some jobs over others. This patch implements pressure stall tracking for cgroups. In kernels with CONFIG_PSI=y, cgroup2 groups will have cpu.pressure, memory.pressure, and io.pressure files that track aggregate pressure stall times for only the tasks inside the cgroup. Link: http://lkml.kernel.org/r/20180828172258.3185-10-hannes@cmpxchg.org Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: Tejun Heo <tj@kernel.org> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: Daniel Drake <drake@endlessm.com> Tested-by: Suren Baghdasaryan <surenb@google.com> Cc: Christopher Lameter <cl@linux.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Johannes Weiner <jweiner@fb.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Enderborg <peter.enderborg@sony.com> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Shakeel Butt <shakeelb@google.com> Cc: Vinayak Menon <vinmenon@codeaurora.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'init')
-rw-r--r--init/Kconfig4
1 files changed, 4 insertions, 0 deletions
diff --git a/init/Kconfig b/init/Kconfig
index 26e639df5517..a4112e95724a 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -501,6 +501,10 @@ config PSI
the share of walltime in which some or all tasks in the system are
delayed due to contention of the respective resource.
+ In kernels with cgroup support, cgroups (cgroup2 only) will
+ have cpu.pressure, memory.pressure, and io.pressure files,
+ which aggregate pressure stalls for the grouped tasks only.
+
For more details see Documentation/accounting/psi.txt.
Say N if unsure.