linux-kernel - Re: [PATCH v2] mm: add alloc_contig_migrate

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Message-ID: <Zd90S7RVgCfwtpxZ@google.com>
Date: Wed, 28 Feb 2024 09:58:35 -0800
From: Minchan Kim <minchan@...nel.org>
To: Richard Chang <richardycc@...gle.com>
Cc: rostedt@...dmis.org, mhiramat@...nel.org,
	mathieu.desnoyers@...icios.com, akpm@...ux-foundation.org,
	liumartin@...gle.com, surenb@...gle.com,
	linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH v2] mm: add alloc_contig_migrate_range allocation
 statistics

On Wed, Feb 28, 2024 at 05:11:17AM +0000, Richard Chang wrote:
> alloc_contig_migrate_range has every information to be able to
> understand big contiguous allocation latency. For example, how many
> pages are migrated, how many times they were needed to unmap from
> page tables.
> 
> This patch adds the trace event to collect the allocation statistics.
> In the field, it was quite useful to understand CMA allocation
> latency.
> 
> Signed-off-by: Richard Chang <richardycc@...gle.com>

Acked-by: Minchan Kim <minchan@...nel.org>