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From: Linus Torvalds <torvalds@linux-foundation.org>
To: Yu Zhao <yuzhao@google.com>
Cc: "Peter Zijlstra" <peterz@infradead.org>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"Stephen Rothwell" <sfr@rothwell.id.au>,
	Linux-MM <linux-mm@kvack.org>, "Andi Kleen" <ak@linux.intel.com>,
	"Aneesh Kumar" <aneesh.kumar@linux.ibm.com>,
	"Barry Song" <21cnbao@gmail.com>,
	"Catalin Marinas" <catalin.marinas@arm.com>,
	"Dave Hansen" <dave.hansen@linux.intel.com>,
	"Hillf Danton" <hdanton@sina.com>, "Jens Axboe" <axboe@kernel.dk>,
	"Jesse Barnes" <jsbarnes@google.com>,
	"Johannes Weiner" <hannes@cmpxchg.org>,
	"Jonathan Corbet" <corbet@lwn.net>,
	"Matthew Wilcox" <willy@infradead.org>,
	"Mel Gorman" <mgorman@suse.de>,
	"Michael Larabel" <Michael@michaellarabel.com>,
	"Michal Hocko" <mhocko@kernel.org>,
	"Mike Rapoport" <rppt@kernel.org>,
	"Rik van Riel" <riel@surriel.com>,
	"Vlastimil Babka" <vbabka@suse.cz>,
	"Will Deacon" <will@kernel.org>,
	"Ying Huang" <ying.huang@intel.com>,
	"Linux ARM" <linux-arm-kernel@lists.infradead.org>,
	"open list:DOCUMENTATION" <linux-doc@vger.kernel.org>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	"Kernel Page Reclaim v2" <page-reclaim@google.com>,
	"the arch/x86 maintainers" <x86@kernel.org>,
	"Brian Geffon" <bgeffon@google.com>,
	"Jan Alexander Steffens" <heftig@archlinux.org>,
	"Oleksandr Natalenko" <oleksandr@natalenko.name>,
	"Steven Barrett" <steven@liquorix.net>,
	"Suleiman Souhlal" <suleiman@google.com>,
	"Daniel Byrne" <djbyrne@mtu.edu>,
	"Donald Carr" <d@chaos-reins.com>,
	"Holger Hoffstätte" <holger@applied-asynchrony.com>,
	"Konstantin Kharlamov" <Hi-Angel@yandex.ru>,
	"Shuang Zhai" <szhai2@cs.rochester.edu>,
	"Sofia Trinh" <sofia.trinh@edi.works>,
	"Vaibhav Jain" <vaibhav@linux.ibm.com>
Subject: Re: [PATCH v10 05/14] mm: multi-gen LRU: groundwork
Date: Wed, 20 Apr 2022 13:07:15 -0700	[thread overview]
Message-ID: <CAHk-=wiPHodQRZuO=b9bzB_e42NkpW4MH6-kWbTp8oYnHMk0WA@mail.gmail.com> (raw)
In-Reply-To: <CAOUHufbUyTL-xx1RBovfSh+CrK7mBHGOouvyQBjy1RX1f3dkzw@mail.gmail.com>

On Tue, Apr 19, 2022 at 5:39 PM Yu Zhao <yuzhao@google.com> wrote:
>
> A related question: if I pass new = old to try_cmpxchg(), does it know
> that and avoid an unnecessary atomic op?

No. try_cmpxchg() basically translates directly to a cmpxchg
instruction (on x86) with the return value being the eflags 'Z' bit.

               Linus

  reply	other threads:[~2022-04-20 20:08 UTC|newest]

Thread overview: 98+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-04-07  3:15 [PATCH v10 00/14] Multi-Gen LRU Framework Yu Zhao
2022-04-07  3:15 ` [PATCH v10 01/14] mm: x86, arm64: add arch_has_hw_pte_young() Yu Zhao
2022-04-07  3:15 ` [PATCH v10 02/14] mm: x86: add CONFIG_ARCH_HAS_NONLEAF_PMD_YOUNG Yu Zhao
2022-04-07  3:15 ` [PATCH v10 03/14] mm/vmscan.c: refactor shrink_node() Yu Zhao
2022-04-16  6:48   ` Miaohe Lin
2022-04-07  3:15 ` [PATCH v10 04/14] Revert "include/linux/mm_inline.h: fold __update_lru_size() into its sole caller" Yu Zhao
2022-04-16  6:50   ` Miaohe Lin
2022-04-07  3:15 ` [PATCH v10 05/14] mm: multi-gen LRU: groundwork Yu Zhao
2022-04-12  2:16   ` Andrew Morton
2022-04-12  7:06     ` Peter Zijlstra
2022-04-20  0:39       ` Yu Zhao
2022-04-20 20:07         ` Linus Torvalds [this message]
2022-04-26 22:39     ` Yu Zhao
2022-04-26 23:42       ` Andrew Morton
2022-04-27  1:18         ` Yu Zhao
2022-04-27  1:34           ` Andrew Morton
2022-04-07  3:15 ` [PATCH v10 06/14] mm: multi-gen LRU: minimal implementation Yu Zhao
2022-04-14  6:03   ` Barry Song
2022-04-14 20:36     ` Yu Zhao
2022-04-14 21:39       ` Andrew Morton
2022-04-14 22:14         ` Yu Zhao
2022-04-15 10:15         ` Barry Song
2022-04-15 20:17           ` Yu Zhao
2022-04-15 10:26       ` Barry Song
2022-04-15 20:18         ` Yu Zhao
     [not found]   ` <71af92d2-0777-c318-67fb-8f7d52c800bb@huawei.com>
2022-04-14 20:53     ` Yu Zhao
2022-04-15  2:23       ` Chen Wandun
2022-04-15  5:25         ` Yu Zhao
2022-04-15  6:31           ` Chen Wandun
2022-04-15  6:44             ` Yu Zhao
2022-04-15  9:27               ` Chen Wandun
2022-04-18  9:58   ` Barry Song
2022-04-19  0:53     ` Yu Zhao
2022-04-19  4:25       ` Barry Song
2022-04-19  4:36         ` Barry Song
2022-04-19 22:25           ` Yu Zhao
2022-04-19 22:20         ` Yu Zhao
2022-04-07  3:15 ` [PATCH v10 07/14] mm: multi-gen LRU: exploit locality in rmap Yu Zhao
2022-04-27  4:32   ` Aneesh Kumar K.V
2022-04-27  4:38     ` Yu Zhao
2022-04-27  5:31       ` Aneesh Kumar K V
2022-04-27  6:00         ` Yu Zhao
2022-04-07  3:15 ` [PATCH v10 08/14] mm: multi-gen LRU: support page table walks Yu Zhao
2022-04-12  2:16   ` Andrew Morton
2022-04-12  7:10     ` Peter Zijlstra
2022-04-15  5:30       ` Yu Zhao
2022-04-15  1:14     ` Yu Zhao
2022-04-15  1:56       ` Andrew Morton
2022-04-15  6:25         ` Yu Zhao
2022-04-15 19:15           ` Andrew Morton
2022-04-15 20:11             ` Yu Zhao
2022-04-15 21:32               ` Andrew Morton
2022-04-15 21:36                 ` Linus Torvalds
2022-04-15 22:57                   ` Yu Zhao
2022-04-15 23:03                     ` Linus Torvalds
2022-04-15 23:24                       ` [page-reclaim] " Jesse Barnes
2022-04-15 23:31                         ` Matthew Wilcox
2022-04-15 23:37                           ` Jesse Barnes
2022-04-15 23:49                       ` Yu Zhao
2022-04-16 16:32                 ` Justin Forbes
2022-04-19 22:32                   ` Yu Zhao
2022-04-29 14:10   ` zhong jiang
2022-04-30  8:34     ` Yu Zhao
2022-04-07  3:15 ` [PATCH v10 09/14] mm: multi-gen LRU: optimize multiple memcgs Yu Zhao
2022-04-07  3:15 ` [PATCH v10 10/14] mm: multi-gen LRU: kill switch Yu Zhao
2022-04-12  2:16   ` Andrew Morton
2022-04-26 20:57     ` Yu Zhao
2022-04-26 22:22       ` Andrew Morton
2022-04-27  1:11         ` Yu Zhao
2022-04-07  3:15 ` [PATCH v10 11/14] mm: multi-gen LRU: thrashing prevention Yu Zhao
2022-04-07  3:15 ` [PATCH v10 12/14] mm: multi-gen LRU: debugfs interface Yu Zhao
2022-04-12  2:16   ` Andrew Morton
2022-04-16  0:03     ` Yu Zhao
2022-04-16  4:20       ` Andrew Morton
2022-04-26  6:59         ` Yu Zhao
2022-04-26 21:30           ` Andrew Morton
2022-04-26 22:15             ` Yu Zhao
2022-04-07  3:15 ` [PATCH v10 13/14] mm: multi-gen LRU: admin guide Yu Zhao
2022-04-07 12:41   ` Bagas Sanjaya
2022-04-07 12:51     ` Jonathan Corbet
2022-04-12  2:16   ` Andrew Morton
2022-04-16  2:22     ` Yu Zhao
2022-04-07  3:15 ` [PATCH v10 14/14] mm: multi-gen LRU: design doc Yu Zhao
2022-04-07 11:39   ` Huang Shijie
2022-04-07 12:41   ` Bagas Sanjaya
2022-04-07 12:52     ` Jonathan Corbet
2022-04-08  4:48       ` Bagas Sanjaya
2022-04-12  2:16   ` Andrew Morton
2022-04-26  7:42     ` Yu Zhao
2022-04-07  3:24 ` [PATCH v10 00/14] Multi-Gen LRU Framework Yu Zhao
2022-04-07  8:31   ` Stephen Rothwell
2022-04-07  9:08     ` Yu Zhao
2022-04-07  9:41     ` Yu Zhao
2022-04-07 12:13       ` Stephen Rothwell
2022-04-08  2:08         ` Yu Zhao
2022-04-12  2:15 ` Andrew Morton
2022-04-14  5:06 ` Andrew Morton
2022-04-20  0:50   ` Yu Zhao

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