linux-kernel - Re: [PATCH v7 03/10] mm: generalize postponed non-root kmem

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Date:   Tue, 25 Jun 2019 11:17:41 -0700
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Roman Gushchin <guro@...com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Linux MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Kernel Team <kernel-team@...com>,
        Johannes Weiner <hannes@...xchg.org>,
        Waiman Long <longman@...hat.com>
Subject: Re: [PATCH v7 03/10] mm: generalize postponed non-root kmem_cache deactivation

On Tue, Jun 11, 2019 at 4:18 PM Roman Gushchin <guro@...com> wrote:
>
> Currently SLUB uses a work scheduled after an RCU grace period
> to deactivate a non-root kmem_cache. This mechanism can be reused
> for kmem_caches release, but requires generalization for SLAB
> case.
>
> Introduce kmemcg_cache_deactivate() function, which calls
> allocator-specific __kmem_cache_deactivate() and schedules
> execution of __kmem_cache_deactivate_after_rcu() with all
> necessary locks in a worker context after an rcu grace period.
>
> Here is the new calling scheme:
>   kmemcg_cache_deactivate()
>     __kmemcg_cache_deactivate()                  SLAB/SLUB-specific
>     kmemcg_rcufn()                               rcu
>       kmemcg_workfn()                            work
>         __kmemcg_cache_deactivate_after_rcu()    SLAB/SLUB-specific
>
> instead of:
>   __kmemcg_cache_deactivate()                    SLAB/SLUB-specific
>     slab_deactivate_memcg_cache_rcu_sched()      SLUB-only
>       kmemcg_rcufn()                             rcu
>         kmemcg_workfn()                          work
>           kmemcg_cache_deact_after_rcu()         SLUB-only
>
> For consistency, all allocator-specific functions start with "__".
>
> Signed-off-by: Roman Gushchin <guro@...com>
> Acked-by: Vladimir Davydov <vdavydov.dev@...il.com>

Reviewed-by: Shakeel Butt <shakeelb@...gle.com>