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Wed, 26 Feb 2025 10:30:17 -0800 (PST) Received: from localhost ([2603:7000:c01:2716:da5e:d3ff:fee7:26e7]) by smtp.gmail.com with UTF8SMTPSA id d75a77b69052e-4737806a5b8sm27450391cf.54.2025.02.26.10.30.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 26 Feb 2025 10:30:17 -0800 (PST) Date: Wed, 26 Feb 2025 13:30:13 -0500 From: Johannes Weiner To: Qi Zheng Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: CONFIG_PT_RECLAIM Message-ID: <20250226183013.GB1042@cmpxchg.org> MIME-Version: 1.0 Content-Disposition: inline X-Stat-Signature: eee5pdahn8og8tdjo9qxfnsed94p6ejd X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: DAF5314000D X-Rspam-User: X-HE-Tag: 1740594618-619915 X-HE-Meta: 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 jeenAcri 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000003, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Does PT_RECLAIM need to be configurable by the user? Why not always try to free the page tables if the arch supports it? diff --git a/mm/Kconfig b/mm/Kconfig index 2761098dbc1a..99383c93db33 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -1309,16 +1309,9 @@ config ARCH_SUPPORTS_PT_RECLAIM def_bool n config PT_RECLAIM - bool "reclaim empty user page table pages" - default y + def_bool y depends on ARCH_SUPPORTS_PT_RECLAIM && MMU && SMP select MMU_GATHER_RCU_TABLE_FREE - help - Try to reclaim empty user page table pages in paths other than munmap - and exit_mmap path. - - Note: now only empty user PTE page table pages will be reclaimed. - source "mm/damon/Kconfig"