From: Joonsoo Kim <js1304@gmail.com>
To: Xishi Qiu <qiuxishi@huawei.com>
Cc: LKML <linux-kernel@vger.kernel.org>, Linux MM <linux-mm@kvack.org>
Subject: Re: a question about slub in function __slab_free()
Date: Wed, 2 Mar 2016 23:38:44 +0900 [thread overview]
Message-ID: <CAAmzW4OV4J_zGh2MSCqE0-x6Z_BopB+ucSVLV6kp53Cw4obkfg@mail.gmail.com> (raw)
In-Reply-To: <56D6DC13.8060008@huawei.com>
2016-03-02 21:26 GMT+09:00 Xishi Qiu <qiuxishi@huawei.com>:
> ___slab_alloc()
> deactivate_slab()
> add_full(s, n, page);
> The page will be added to full list and the frozen is 0, right?
>
> __slab_free()
> prior = page->freelist; // prior is NULL
> was_frozen = new.frozen; // was_frozen is 0
> ...
> /*
> * Slab was on no list before and will be
> * partially empty
> * We can defer the list move and instead
> * freeze it.
> */
> new.frozen = 1;
> ...
>
> I don't understand why "Slab was on no list before"?
add_full() is defined only for CONFIG_SLUB_DEBUG.
And, actual add happens if slub_debug=u is enabled.
In other cases, fully used slab isn't attached on any list.
Thanks.
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next prev parent reply other threads:[~2016-03-02 14:38 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-02 12:26 a question about slub in function __slab_free() Xishi Qiu
2016-03-02 14:38 ` Joonsoo Kim [this message]
2016-03-03 1:26 ` Xishi Qiu
2016-03-02 15:12 ` Jianyu Zhan
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