From: Qi Zheng <qi.zheng@linux.dev>
To: david@kernel.org, andreas@gaisler.com, richard.weiyang@gmail.com,
will@kernel.org, peterz@infradead.org, aneesh.kumar@kernel.org,
npiggin@gmail.com, dev.jain@arm.com, ioworker0@gmail.com,
linmag7@gmail.com, akpm@linux-foundation.org
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,
sparclinux@vger.kernel.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 v4 6/8] um: mm: enable MMU_GATHER_RCU_TABLE_FREE
Date: Tue, 27 Jan 2026 20:12:59 +0800 [thread overview]
Message-ID: <e2217546504668b8a87a39eb0e378839339a1bb4.1769515122.git.zhengqi.arch@bytedance.com> (raw)
In-Reply-To: <cover.1769515122.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 8415d39b0d430..098cda44db225 100644
--- a/arch/um/Kconfig
+++ b/arch/um/Kconfig
@@ -42,6 +42,7 @@ 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:[~2026-01-27 12:16 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-27 12:12 [PATCH v4 0/8] enable PT_RECLAIM on more 64-bit architectures Qi Zheng
2026-01-27 12:12 ` [PATCH v4 1/8] mm: change mm/pt_reclaim.c to use asm/tlb.h instead of asm-generic/tlb.h Qi Zheng
2026-01-27 12:12 ` [PATCH v4 2/8] alpha: mm: enable MMU_GATHER_RCU_TABLE_FREE Qi Zheng
2026-02-01 22:01 ` Magnus Lindholm
2026-01-27 12:12 ` [PATCH v4 3/8] LoongArch: " Qi Zheng
2026-01-27 12:12 ` [PATCH v4 4/8] mips: " Qi Zheng
2026-01-27 12:12 ` [PATCH v4 5/8] parisc: " Qi Zheng
2026-02-07 2:34 ` Helge Deller
2026-01-27 12:12 ` Qi Zheng [this message]
2026-01-27 12:13 ` [PATCH v4 7/8] mm: convert __HAVE_ARCH_TLB_REMOVE_TABLE to CONFIG_HAVE_ARCH_TLB_REMOVE_TABLE config Qi Zheng
2026-02-06 11:06 ` David Hildenbrand (Arm)
2026-02-06 11:13 ` Qi Zheng
2026-02-06 11:45 ` David Hildenbrand (Arm)
2026-02-06 11:58 ` Qi Zheng
2026-02-06 12:59 ` David Hildenbrand (Arm)
2026-02-06 13:33 ` Andreas Larsson
2026-01-27 12:13 ` [PATCH v4 8/8] mm: make PT_RECLAIM depends on MMU_GATHER_RCU_TABLE_FREE Qi Zheng
2026-01-27 20:46 ` [PATCH v4 0/8] enable PT_RECLAIM on more 64-bit architectures Andrew Morton
2026-01-28 2:07 ` Qi Zheng
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