From: Linus Torvalds <torvalds@linux-foundation.org>
To: Barry Song <21cnbao@gmail.com>
Cc: "Yu Zhao" <yuzhao@google.com>, "Will Deacon" <will@kernel.org>,
"Andrew Morton" <akpm@linux-foundation.org>,
Linux-MM <linux-mm@kvack.org>, "Andi Kleen" <ak@linux.intel.com>,
"Aneesh Kumar" <aneesh.kumar@linux.ibm.com>,
"Catalin Marinas" <catalin.marinas@arm.com>,
"Dave Hansen" <dave.hansen@linux.intel.com>,
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"Jonathan Corbet" <corbet@lwn.net>,
"Matthew Wilcox" <willy@infradead.org>,
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"Michael Larabel" <Michael@michaellarabel.com>,
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"Brian Geffon" <bgeffon@google.com>,
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huzhanyuan@oppo.com
Subject: Re: [PATCH v11 07/14] mm: multi-gen LRU: exploit locality in rmap
Date: Wed, 8 Jun 2022 08:51:40 -0700 [thread overview]
Message-ID: <CAHk-=wirMfOpzNavjWao5GA65ve=9LQN-6=YCUtJGRpu=ujdoA@mail.gmail.com> (raw)
In-Reply-To: <CAGsJ_4yvsXCj8snemAyX3jPJgWJR+tFCtUhV-3QJ75RNi=q_KA@mail.gmail.com>
On Tue, Jun 7, 2022 at 5:43 PM Barry Song <21cnbao@gmail.com> wrote:
>
> Given we used to have a flush for clear pte young in LRU, right now we are
> moving to nop in almost all cases for the flush unless the address becomes
> young exactly after look_around and before ptep_clear_flush_young_notify.
> It means we are actually dropping flush. So the question is, were we
> overcautious? we actually don't need the flush at all even without mglru?
We stopped flushing the TLB on A bit clears on x86 back in 2014.
See commit b13b1d2d8692 ("x86/mm: In the PTE swapout page reclaim case
clear the accessed bit instead of flushing the TLB").
Linus
next prev parent reply other threads:[~2022-06-08 15:57 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-18 1:46 [PATCH v11 00/14] Multi-Gen LRU Framework Yu Zhao
2022-05-18 1:46 ` [PATCH v11 01/14] mm: x86, arm64: add arch_has_hw_pte_young() Yu Zhao
2022-05-18 1:46 ` [PATCH v11 02/14] mm: x86: add CONFIG_ARCH_HAS_NONLEAF_PMD_YOUNG Yu Zhao
2022-05-18 1:46 ` [PATCH v11 03/14] mm/vmscan.c: refactor shrink_node() Yu Zhao
2022-05-18 1:46 ` [PATCH v11 04/14] Revert "include/linux/mm_inline.h: fold __update_lru_size() into its sole caller" Yu Zhao
2022-05-18 1:46 ` [PATCH v11 05/14] mm: multi-gen LRU: groundwork Yu Zhao
2022-06-09 5:33 ` zhong jiang
2022-05-18 1:46 ` [PATCH v11 06/14] mm: multi-gen LRU: minimal implementation Yu Zhao
2022-06-09 12:34 ` zhong jiang
2022-06-09 14:46 ` zhong jiang
2022-05-18 1:46 ` [PATCH v11 07/14] mm: multi-gen LRU: exploit locality in rmap Yu Zhao
2022-06-06 9:25 ` Barry Song
2022-06-07 7:37 ` Barry Song
2022-06-07 10:21 ` Will Deacon
2022-06-06 22:37 ` Barry Song
2022-06-07 10:43 ` Will Deacon
2022-06-07 21:06 ` Yu Zhao
2022-06-08 0:43 ` Barry Song
2022-06-08 15:51 ` Linus Torvalds [this message]
2022-06-08 22:45 ` Barry Song
2022-06-16 21:55 ` Yu Zhao
2022-06-16 22:33 ` Barry Song
2022-06-16 23:29 ` Yu Zhao
2022-06-17 1:42 ` Yu Zhao
2022-06-17 2:01 ` Barry Song
2022-06-17 3:03 ` Yu Zhao
2022-06-17 3:17 ` Yu Zhao
2022-06-19 20:36 ` Yu Zhao
2022-06-19 21:56 ` Barry Song
2022-06-07 19:07 ` Yu Zhao
2022-06-08 7:48 ` Barry Song
2022-06-07 18:58 ` Yu Zhao
2022-05-18 1:46 ` [PATCH v11 08/14] mm: multi-gen LRU: support page table walks Yu Zhao
2022-05-18 1:46 ` [PATCH v11 09/14] mm: multi-gen LRU: optimize multiple memcgs Yu Zhao
2022-05-18 1:46 ` [PATCH v11 10/14] mm: multi-gen LRU: kill switch Yu Zhao
2022-05-18 1:46 ` [PATCH v11 11/14] mm: multi-gen LRU: thrashing prevention Yu Zhao
2022-05-18 1:46 ` [PATCH v11 12/14] mm: multi-gen LRU: debugfs interface Yu Zhao
2022-05-18 1:46 ` [PATCH v11 13/14] mm: multi-gen LRU: admin guide Yu Zhao
2022-05-18 1:46 ` [PATCH v11 14/14] mm: multi-gen LRU: design doc Yu Zhao
2022-05-18 2:05 ` [PATCH v11 00/14] Multi-Gen LRU Framework Jens Axboe
2022-06-07 22:47 ` Yu Zhao
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