linux-kernel - Re: [PATCH v3 2/2] slub: use count_partial_free_approx() in slab_out_of

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Message-ID: <3f53b749-46b3-d1a6-8984-c8a3fc9481ac@google.com>
Date: Fri, 19 Apr 2024 17:18:44 -0700 (PDT)
From: David Rientjes <rientjes@...gle.com>
To: Jianfeng Wang <jianfeng.w.wang@...cle.com>
cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org, vbabka@...e.cz, 
    cl@...ux.com, akpm@...ux-foundation.org, penberg@...nel.org
Subject: Re: [PATCH v3 2/2] slub: use count_partial_free_approx() in
 slab_out_of_memory()

On Fri, 19 Apr 2024, Jianfeng Wang wrote:

> slab_out_of_memory() uses count_partial() to get the exact count
> of free objects for each node. As it may get called in the slab
> allocation path, count_partial_free_approx() can be used to avoid
> the risk and overhead of traversing a long partial slab list.
> 
> At the same time, show_slab_objects() still uses count_partial().
> Thus, slub users can still have the option to access the exact
> count of objects via sysfs if the overhead is acceptable to them.
> 
> Signed-off-by: Jianfeng Wang <jianfeng.w.wang@...cle.com>

Acked-by: David Rientjes <rientjes@...gle.com>