linux-kernel - Re: [PATCH 0/9] mm/madvise: batch tlb flushes for MADV_DONTNEED and MADV

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Message-Id: <20250310153921.47d390c637105e3ad6fc49c0@linux-foundation.org>
Date: Mon, 10 Mar 2025 15:39:21 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: SeongJae Park <sj@...nel.org>
Cc: "Liam R. Howlett" <howlett@...il.com>, David Hildenbrand
 <david@...hat.com>, Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, Shakeel
 Butt <shakeel.butt@...ux.dev>, Vlastimil Babka <vbabka@...e.cz>,
 kernel-team@...a.com, linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 0/9] mm/madvise: batch tlb flushes for MADV_DONTNEED and
 MADV_FREE

On Mon, 10 Mar 2025 10:23:09 -0700 SeongJae Park <sj@...nel.org> wrote:

>  It is unclear if such use case
> is common and the inefficiency is significant. 

Well, we could conduct a survey,

Can you add some logging to detect when userspace performs such an
madvise() call, then run that kernel on some "typical" machines which
are running "typical" workloads?  That should give us a feeling for how
often userspace does this, and hence will help us understand the usefulness
of this patchset.