linux-kernel - Re: [PATCH 2/2] ksm: Optimize rmap_walk_ksm by passing a suitable address range

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Message-ID: <20260115153413416ZHFvu9Uuv-HbyU9UKguyW@zte.com.cn>
Date: Thu, 15 Jan 2026 15:34:13 +0800 (CST)
From: <yang.yang29@....com.cn>
To: <xu.xin16@....com.cn>
Cc: <akpm@...ux-foundation.org>, <david@...nel.org>,
        <chengming.zhou@...ux.dev>, <hughd@...gle.com>,
        <wang.yaxin@....com.cn>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] ksm: Optimize rmap_walk_ksm by passing a suitable address  range

> + pgoff_start = rmap_item->address >> PAGE_SHIFT;
> + pgoff_end = pgoff_start + folio_nr_pages(folio) - 1;
> +
> anon_vma_interval_tree_foreach(vmac, &anon_vma->rb_root,
> - 0, ULONG_MAX) {
> + pgoff_start, pgoff_end) {

Good job.
I see there is another similar situations in collect_procs_ksm().
We can simulate memory errors by calling the memory_failure().