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Message-Id: <58942ecf91fea0a62307e5ab848228142a1270ac.1719570849.git.zhengqi.arch@bytedance.com>
Date: Mon, 1 Jul 2024 16:46:43 +0800
From: Qi Zheng <zhengqi.arch@...edance.com>
To: david@...hat.com,
hughd@...gle.com,
willy@...radead.org,
mgorman@...e.de,
muchun.song@...ux.dev,
akpm@...ux-foundation.org
Cc: linux-mm@...ck.org,
linux-kernel@...r.kernel.org,
Qi Zheng <zhengqi.arch@...edance.com>
Subject: [RFC PATCH 2/7] mm: introduce CONFIG_PT_RECLAIM
This configuration variable will be used to build the code needed
to free empty user page table pages.
This feature is not available on all architectures yet, so
ARCH_SUPPORTS_PT_RECLAIM is needed. We can remove it once all
architectures support this feature.
Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>
---
mm/Kconfig | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/mm/Kconfig b/mm/Kconfig
index 991fa9cf6137..7e2c87784d86 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -1256,6 +1256,20 @@ config IOMMU_MM_DATA
config EXECMEM
bool
+config ARCH_SUPPORTS_PT_RECLAIM
+ def_bool n
+
+config PT_RECLAIM
+ bool "reclaim empty user page table pages"
+ default 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 that munmap
+ and exit_mmap path.
+
+ Note: now only empty user PTE page table pages will be reclaimed.
+
source "mm/damon/Kconfig"
endmenu
--
2.20.1
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