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Date: Fri, 19 Apr 2024 17:18:44 -0700 (PDT)
From: David Rientjes <rientjes@google.com>
To: Jianfeng Wang <jianfeng.w.wang@oracle.com>
cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, vbabka@suse.cz, 
    cl@linux.com, akpm@linux-foundation.org, penberg@kernel.org
Subject: Re: [PATCH v3 2/2] slub: use count_partial_free_approx() in
 slab_out_of_memory()
In-Reply-To: <20240419175611.47413-3-jianfeng.w.wang@oracle.com>
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References: <20240419175611.47413-1-jianfeng.w.wang@oracle.com> <20240419175611.47413-3-jianfeng.w.wang@oracle.com>
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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@oracle.com>

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