linux-kernel - Re: [RFC PATCH 00/16] mm/madvise: batch tlb flushes for MADV_DONTNEED and MADV

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Message-Id: <20250305230221.60260-1-sj@kernel.org>
Date: Wed,  5 Mar 2025 15:02:21 -0800
From: SeongJae Park <sj@...nel.org>
To: Nadav Amit <nadav.amit@...il.com>
Cc: SeongJae Park <sj@...nel.org>,
	"Liam R. Howlett" <howlett@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	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 Mailing List <linux-kernel@...r.kernel.org>,
	"open list:MEMORY MANAGEMENT" <linux-mm@...ck.org>
Subject: Re: [RFC PATCH 00/16] mm/madvise: batch tlb flushes for MADV_DONTNEED and MADV_FREE

On Wed, 5 Mar 2025 22:36:45 +0200 Nadav Amit <nadav.amit@...il.com> wrote:

> 
> > On 5 Mar 2025, at 20:15, SeongJae Park <sj@...nel.org> wrote:
> > 
> > For MADV_DONTNEED[_LOCKED] or MADV_FREE madvise requests, tlb flushes
> > can happen for each vma of the given address ranges.  Because such tlb
> > flushes are for address ranges of same process, doing those in a batch
> > is more efficient while still being safe.  Modify madvise() and
> > process_madvise() entry level code path to do such batched tlb flushes,
> > while the internal unmap logics do only gathering of the tlb entries to
> > flush.
> 
> I made some related (similar?) patches in the past. You can see if you
> find something useful in the discussion there. I think your version avoids
> some of the “mistakes” I made.

Thank you for sharing this!  I sure I can learn and use many things from this
work and previous discussions.

> 
> [1] https://lore.kernel.org/all/20210926161259.238054-1-namit@vmware.com/T/#m23ccd29bad04a963c4d8c64ec3581f7c301c7806


Thanks,
SJ