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authorJiebin Sun <jiebin.sun@intel.com>2022-09-13 22:25:38 +0300
committerAndrew Morton <akpm@linux-foundation.org>2022-10-04 00:21:44 +0300
commit72d1e611082eda18689106a0c192f2827072713c (patch)
tree5325e3c5d0d7481c82c940bde971c5f738589e45 /ipc/namespace.c
parent5d0ce3595ab75330a15cec914096efbbb8b41e4a (diff)
downloadlinux-72d1e611082eda18689106a0c192f2827072713c.tar.xz
ipc/msg: mitigate the lock contention with percpu counter
The msg_bytes and msg_hdrs atomic counters are frequently updated when IPC msg queue is in heavy use, causing heavy cache bounce and overhead. Change them to percpu_counter greatly improve the performance. Since there is one percpu struct per namespace, additional memory cost is minimal. Reading of the count done in msgctl call, which is infrequent. So the need to sum up the counts in each CPU is infrequent. Apply the patch and test the pts/stress-ng-1.4.0 -- system v message passing (160 threads). Score gain: 3.99x CPU: ICX 8380 x 2 sockets Core number: 40 x 2 physical cores Benchmark: pts/stress-ng-1.4.0 -- system v message passing (160 threads) [akpm@linux-foundation.org: coding-style cleanups] [jiebin.sun@intel.com: avoid negative value by overflow in msginfo] Link: https://lkml.kernel.org/r/20220920150809.4014944-1-jiebin.sun@intel.com [akpm@linux-foundation.org: fix min() warnings] Link: https://lkml.kernel.org/r/20220913192538.3023708-3-jiebin.sun@intel.com Signed-off-by: Jiebin Sun <jiebin.sun@intel.com> Reviewed-by: Tim Chen <tim.c.chen@linux.intel.com> Cc: Alexander Mikhalitsyn <alexander.mikhalitsyn@virtuozzo.com> Cc: Alexey Gladkov <legion@kernel.org> Cc: Christoph Lameter <cl@linux.com> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Dennis Zhou <dennis@kernel.org> Cc: "Eric W . Biederman" <ebiederm@xmission.com> Cc: Manfred Spraul <manfred@colorfullife.com> Cc: Shakeel Butt <shakeelb@google.com> Cc: Tejun Heo <tj@kernel.org> Cc: Vasily Averin <vasily.averin@linux.dev> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'ipc/namespace.c')
-rw-r--r--ipc/namespace.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/ipc/namespace.c b/ipc/namespace.c
index e1fcaedba4fa..8316ea585733 100644
--- a/ipc/namespace.c
+++ b/ipc/namespace.c
@@ -66,8 +66,11 @@ static struct ipc_namespace *create_ipc_ns(struct user_namespace *user_ns,
if (!setup_ipc_sysctls(ns))
goto fail_mq;
+ err = msg_init_ns(ns);
+ if (err)
+ goto fail_put;
+
sem_init_ns(ns);
- msg_init_ns(ns);
shm_init_ns(ns);
return ns;