linux-kernel - Re: [PATCH v10 00/12] LUF(Lazy Unmap Flush) reducing tlb numbers over 90%

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Date: Sun, 26 May 2024 19:43:10 -0700
From: Dave Hansen <dave.hansen@...el.com>
To: Byungchul Park <byungchul@...com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
 kernel_team@...ynix.com, akpm@...ux-foundation.org, ying.huang@...el.com,
 vernhao@...cent.com, mgorman@...hsingularity.net, hughd@...gle.com,
 willy@...radead.org, david@...hat.com, peterz@...radead.org,
 luto@...nel.org, tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
 dave.hansen@...ux.intel.com, rjgolo@...il.com
Subject: Re: [PATCH v10 00/12] LUF(Lazy Unmap Flush) reducing tlb numbers over
 90%

On 5/26/24 18:57, Byungchul Park wrote:
..
> Plus, I will add another give-up at code changing the permission of vma
> to writable.

I suspect you have a much more general problem on your hands. Just
tweaking the VFS or mmap() code likely isn't going to cut it.

I guess we'll see what you come up with next, but this email was really
just the result of Vlastimil and I chatting on IRC for five minutes
about this set.

It has absolutely not been tested nor reviewed enough.  <fud>I hope the
performance gains stick around once more of the bugs are gone.</fud>