linux-kernel - Re: [PATCH] mm: /proc/pid/smaps

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Message-ID: <20221020153101.425njbgquuu6ezv3@revolver>
Date:   Thu, 20 Oct 2022 15:31:25 +0000
From:   Liam Howlett <liam.howlett@...cle.com>
To:     Hugh Dickins <hughd@...gle.com>
CC:     Andrew Morton <akpm@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Seth Jenkins <sethjenkins@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH] mm: /proc/pid/smaps_rollup: fix maple tree search


Thanks Hugh.  I guess this 'optimisation' was a little more aggressive
and a little more buggy than needed.

Reviewed-by: Liam R. Howlett <Liam.Howlett@...cle.com>

* Hugh Dickins <hughd@...gle.com> [221018 23:18]:
> /proc/pid/smaps_rollup showed 0 kB for everything: now find first vma.
> 
> Fixes: c4c84f06285e ("fs/proc/task_mmu: stop using linked list and highest_vm_end")
> Signed-off-by: Hugh Dickins <hughd@...gle.com>
> ---
> 
>  fs/proc/task_mmu.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> --- 6.1-rc1/fs/proc/task_mmu.c
> +++ linux/fs/proc/task_mmu.c
> @@ -902,7 +902,7 @@ static int show_smaps_rollup(struct seq_
>  		goto out_put_mm;
>  
>  	hold_task_mempolicy(priv);
> -	vma = mas_find(&mas, 0);
> +	vma = mas_find(&mas, ULONG_MAX);
>  
>  	if (unlikely(!vma))
>  		goto empty_set;