linux-kernel - Re: [PATCH 2/5] mm: page_alloc: trace type pollution from compaction capturing

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Message-ID: <9AFC1858-947B-46A7-A332-EEBCA456670F@nvidia.com>
Date: Fri, 14 Mar 2025 14:36:28 -0400
From: Zi Yan <ziy@...dia.com>
To: Johannes Weiner <hannes@...xchg.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
 Vlastimil Babka <vbabka@...e.cz>, Mel Gorman <mgorman@...hsingularity.net>,
 linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] mm: page_alloc: trace type pollution from compaction
 capturing

On 13 Mar 2025, at 17:05, Johannes Weiner wrote:

> When the page allocator places pages of a certain migratetype into
> blocks of another type, it has lasting effects on the ability to
> compact and defragment down the line. For improving placement and
> compaction, visibility into such events is crucial.
>
> The most common case, allocator fallbacks, is already annotated, but
> compaction capturing is also allowed to grab pages of a different
> type. Extend the tracepoint to cover this case.
>
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>
> ---
>  mm/page_alloc.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
Acked-by: Zi Yan <ziy@...dia.com>

Best Regards,
Yan, Zi