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Date:   Thu, 8 Apr 2021 12:47:10 +0200
From:   Oscar Salvador <>
To:     Dave Hansen <>
Subject: Re: [PATCH 05/10] mm/migrate: demote pages during reclaim

On Thu, Apr 01, 2021 at 11:32:25AM -0700, Dave Hansen wrote:
> From: Dave Hansen <>
> This is mostly derived from a patch from Yang Shi:
> Add code to the reclaim path (shrink_page_list()) to "demote" data
> to another NUMA node instead of discarding the data.  This always
> avoids the cost of I/O needed to read the page back in and sometimes
> avoids the writeout cost when the pagee is dirty.
> A second pass through shrink_page_list() will be made if any demotions
> fail.  This essentally falls back to normal reclaim behavior in the
> case that demotions fail.  Previous versions of this patch may have
> simply failed to reclaim pages which were eligible for demotion but
> were unable to be demoted in practice.
> Note: This just adds the start of infratructure for migration. It is
> actually disabled next to the FIXME in migrate_demote_page_ok().
> Signed-off-by: Dave Hansen <>
> Cc: Wei Xu <>
> Cc: Yang Shi <>
> Cc: David Rientjes <>
> Cc: Huang Ying <>
> Cc: Dan Williams <>
> Cc: osalvador <>

Reviewed-by: Oscar Salvador <>

Oscar Salvador

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