diff options
| author | Shakeel Butt <shakeel.butt@linux.dev> | 2025-05-18 23:31:39 -0700 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2025-05-31 22:46:08 -0700 |
| commit | 940b01fc8dc1aead398819215650727cb9e7335e (patch) | |
| tree | 8c06e283d9ba0e52da7fc942151381a431f50922 /init | |
| parent | 25352d2f2dc630b33cb61228dbdf7a0a2d6a4117 (diff) | |
memcg: nmi safe memcg stats for specific archs
There are archs which have NMI but does not support this_cpu_* ops safely
in the nmi context but they support safe atomic ops in nmi context. For
such archs, let's add infra to use atomic ops for the memcg stats which
can be updated in nmi.
At the moment, the memcg stats which get updated in the objcg charging
path are MEMCG_KMEM, NR_SLAB_RECLAIMABLE_B & NR_SLAB_UNRECLAIMABLE_B.
Rather than adding support for all memcg stats to be nmi safe, let's just
add infra to make these three stats nmi safe which this patch is doing.
Link: https://lkml.kernel.org/r/20250519063142.111219-3-shakeel.butt@linux.dev
Signed-off-by: Shakeel Butt <shakeel.butt@linux.dev>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'init')
| -rw-r--r-- | init/Kconfig | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/init/Kconfig b/init/Kconfig index a2aa49cfb8bd..e9f47baa34e0 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -1013,6 +1013,13 @@ config MEMCG_NMI_UNSAFE depends on !ARCH_HAS_NMI_SAFE_THIS_CPU_OPS && !ARCH_HAVE_NMI_SAFE_CMPXCHG default y +config MEMCG_NMI_SAFETY_REQUIRES_ATOMIC + bool + depends on MEMCG + depends on HAVE_NMI + depends on !ARCH_HAS_NMI_SAFE_THIS_CPU_OPS && ARCH_HAVE_NMI_SAFE_CMPXCHG + default y + config MEMCG_V1 bool "Legacy cgroup v1 memory controller" depends on MEMCG |