From: Qi Zheng <qi.zheng@linux.dev>
To: will@kernel.org, aneesh.kumar@kernel.org, npiggin@gmail.com,
peterz@infradead.org, dev.jain@arm.com,
akpm@linux-foundation.org, david@kernel.org, ioworker0@gmail.com,
linmag7@gmail.com
Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, linux-alpha@vger.kernel.org,
loongarch@lists.linux.dev, linux-mips@vger.kernel.org,
linux-parisc@vger.kernel.org, linux-um@lists.infradead.org,
Qi Zheng <zhengqi.arch@bytedance.com>,
Richard Weinberger <richard@nod.at>,
Anton Ivanov <anton.ivanov@cambridgegreys.com>,
Johannes Berg <johannes@sipsolutions.net>
Subject: [PATCH v2 6/7] um: mm: enable MMU_GATHER_RCU_TABLE_FREE
Date: Wed, 19 Nov 2025 15:31:23 +0800 [thread overview]
Message-ID: <16ab9e6ce0febaf2fc383b7e09e3f1fb2ad63a40.1763537007.git.zhengqi.arch@bytedance.com> (raw)
In-Reply-To: <cover.1763537007.git.zhengqi.arch@bytedance.com>
From: Qi Zheng <zhengqi.arch@bytedance.com>
On a 64-bit system, madvise(MADV_DONTNEED) may cause a large number of
empty PTE page table pages (such as 100GB+). To resolve this problem,
first enable MMU_GATHER_RCU_TABLE_FREE to prepare for enabling the
PT_RECLAIM feature, which resolves this problem.
Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Cc: Johannes Berg <johannes@sipsolutions.net>
---
arch/um/Kconfig | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/um/Kconfig b/arch/um/Kconfig
index 097c6a6265ef3..47a41bc77bb24 100644
--- a/arch/um/Kconfig
+++ b/arch/um/Kconfig
@@ -41,6 +41,7 @@ config UML
select HAVE_SYSCALL_TRACEPOINTS
select THREAD_INFO_IN_TASK
select SPARSE_IRQ
+ select MMU_GATHER_RCU_TABLE_FREE
config MMU
bool
--
2.20.1
next prev parent reply other threads:[~2025-11-19 7:33 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-19 7:31 [PATCH v2 0/7] enable PT_RECLAIM on all 64-bit architectures Qi Zheng
2025-11-19 7:31 ` [PATCH v2 1/7] mm: change mm/pt_reclaim.c to use asm/tlb.h instead of asm-generic/tlb.h Qi Zheng
2025-11-19 11:41 ` David Hildenbrand (Red Hat)
2025-11-19 12:17 ` Qi Zheng
2025-11-19 7:31 ` [PATCH v2 2/7] alpha: mm: enable MMU_GATHER_RCU_TABLE_FREE Qi Zheng
2025-11-19 7:31 ` [PATCH v2 3/7] LoongArch: " Qi Zheng
2025-11-19 7:31 ` [PATCH v2 4/7] mips: " Qi Zheng
2025-11-19 7:31 ` [PATCH v2 5/7] parisc: " Qi Zheng
2025-11-19 7:31 ` Qi Zheng [this message]
2025-11-19 7:31 ` [PATCH v2 7/7] mm: enable PT_RECLAIM on all 64-bit architectures Qi Zheng
2025-11-19 11:38 ` David Hildenbrand (Red Hat)
2025-11-19 12:15 ` Qi Zheng
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