From: Andrew Morton <akpm@linux-foundation.org>
To: Wei Yang <richard.weiyang@gmail.com>
Cc: will@kernel.org, aneesh.kumar@kernel.org, npiggin@gmail.com,
peterz@infradead.org, linux-arch@vger.kernel.org,
linux-mm@kvack.org, Qi Zheng <qi.zheng@linux.dev>,
"David Hildenbrand (Arm)" <david@kernel.org>
Subject: Re: [PATCH] mm/mmu_gather: define RCU version tlb_remove_table_one() in CONFIG_MMU_GATHER_RCU_TABLE_FREE
Date: Sun, 22 Feb 2026 11:42:01 -0800 [thread overview]
Message-ID: <20260222114201.095379dd766b68dcecbab1c5@linux-foundation.org> (raw)
In-Reply-To: <20260222004512.839-1-richard.weiyang@gmail.com>
On Sun, 22 Feb 2026 00:45:12 +0000 Wei Yang <richard.weiyang@gmail.com> wrote:
> Before commit 718b13861d22 ("x86: mm: free page table pages by RCU
> instead of semi RCU"), the page table pages will be freed by semi RCU,
> that is:
>
> - batch table freeing: asynchronous free by RCU
> - single table freeing: IPI + synchronous free
>
> This commit introduce a RCU version for single table freeing to support
> PT_RECLAIM. While it is not necessary to limit the RCU version only in
> CONFIG_PT_RECLAIM. It is reasonable to asynchronous free single table by
> RCU if CONFIG_MMU_GATHER_RCU_TABLE_FREE.
>
> This patch moves the definition of single table freeing in
> CONFIG_MMU_GATHER_RCU_TABLE_FREE, so we have both RCU version
> batch/single table freeing if CONFIG_MMU_GATHER_RCU_TABLE_FREE.
What are the expected (and measured!) benefits of this?
prev parent reply other threads:[~2026-02-22 19:42 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-22 0:45 Wei Yang
2026-02-22 19:42 ` Andrew Morton [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20260222114201.095379dd766b68dcecbab1c5@linux-foundation.org \
--to=akpm@linux-foundation.org \
--cc=aneesh.kumar@kernel.org \
--cc=david@kernel.org \
--cc=linux-arch@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=npiggin@gmail.com \
--cc=peterz@infradead.org \
--cc=qi.zheng@linux.dev \
--cc=richard.weiyang@gmail.com \
--cc=will@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox