linux-kernel - Re: [PATCH] maple_tree: use GFP_KERNEL on mas_node

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Message-ID: <20230907044119epcms1p3ff1dd04b02119ff11b77fe40b4842afd@epcms1p3>
Date:   Thu, 07 Sep 2023 13:41:19 +0900
From:   Jaeseon Sim <jason.sim@...sung.com>
To:     Matthew Wilcox <willy@...radead.org>,
        Peng Zhang <zhangpeng.00@...edance.com>
CC:     "liam.howlett@...cle.com" <liam.howlett@...cle.com>,
        "surenb@...gle.com" <surenb@...gle.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jaewon31.kim@...il.com" <jaewon31.kim@...il.com>,
        "maple-tree@...ts.infradead.org" <maple-tree@...ts.infradead.org>
Subject: Re: [PATCH] maple_tree: use GFP_KERNEL on mas_node_count

> On Thu, Sep 07, 2023 at 12:02:02PM +0800, Peng Zhang wrote:
> > 
> > 
> > 在 2023/9/7 11:49, Matthew Wilcox 写道:
> > > On Thu, Sep 07, 2023 at 12:39:14PM +0900, 심재선 wrote:
> > > > Use GFP_KERNEL on mas_node_count instead of GFP_NOWAIT | __GFP_NOWARN
> > > > in order to allow memory reclaim.
> > There are many paths that call maple tree's mas_node_count(). Some paths
> > cannot reclaim memory.
> 
> Right ... but we should be handling the ENOMEM inside the maple tree and
> allocating some nodes with GFP_KERNEL instead of failing fork().
> 
> > > What testing did you do of this patch?  In particular, did you try it
> > > with lockdep enabled?
I did power on/off test with this patch.
I did not try it with lockdep enabled.