From: Qi Zheng <arch0.zheng@gmail.com>
To: "David Hildenbrand (Red Hat)" <david@kernel.org>,
Qi Zheng <qi.zheng@linux.dev>,
will@kernel.org, aneesh.kumar@kernel.org, npiggin@gmail.com,
peterz@infradead.org, dev.jain@arm.com,
akpm@linux-foundation.org, ioworker0@gmail.com
Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, linux-alpha@vger.kernel.org,
linux-snps-arc@lists.infradead.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>
Subject: Re: [PATCH 0/7] enable PT_RECLAIM on all 64-bit architectures
Date: Tue, 18 Nov 2025 19:53:50 +0800 [thread overview]
Message-ID: <f7f0ca8d-bca2-4a3e-8c45-85cba1b0ff18@gmail.com> (raw)
In-Reply-To: <83e88171-54cb-4112-a344-f6a7d7f13784@kernel.org>
On 11/18/25 12:53 AM, David Hildenbrand (Red Hat) wrote:
> On 14.11.25 12:11, Qi Zheng wrote:
>> From: Qi Zheng <zhengqi.arch@bytedance.com>
>>
>> Hi all,
>>
>> This series aims to enable PT_RECLAIM on all 64-bit architectures.
>>
>> 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, we need to
>> enable
>> PT_RECLAIM, which depends on MMU_GATHER_RCU_TABLE_FREE.
>>
>
> Makes sense!
>
>> Therefore, this series first enables MMU_GATHER_RCU_TABLE_FREE on all
>> 64-bit
>> architectures, and finally makes PT_RECLAIM depend on
>> MMU_GATHER_RCU_TABLE_FREE
>> && 64BIT. This way, PT_RECLAIM can be enabled by default on all 64-bit
>> architectures.
>
> Could we then even go ahead and stop making PT_RECLAIM user-selectable?
OK, will change to:
config PT_RECLAIM
def_bool y
depends on MMU_GATHER_RCU_TABLE_FREE && MMU && SMP && 64BIT
>
next prev parent reply other threads:[~2025-11-18 11:55 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-14 11:11 [PATCH 0/7] enable PT_RECLAIM on all 64-bit architectures Qi Zheng
2025-11-14 11:11 ` [PATCH 1/7] alpha: mm: enable MMU_GATHER_RCU_TABLE_FREE Qi Zheng
2025-11-14 19:13 ` Magnus Lindholm
2025-11-15 9:06 ` Qi Zheng
2025-11-14 11:11 ` [PATCH 2/7] arc: " Qi Zheng
2025-11-14 11:20 ` Qi Zheng
2025-11-14 23:10 ` Vineet Gupta
2025-11-15 9:08 ` Qi Zheng
2025-11-14 11:11 ` [PATCH 3/7] loongarch: " Qi Zheng
2025-11-14 14:17 ` Huacai Chen
2025-11-14 15:55 ` Qi Zheng
2025-11-17 6:41 ` Qi Zheng
2025-11-17 6:57 ` Huacai Chen
2025-11-14 11:11 ` [PATCH 4/7] mips: " Qi Zheng
2025-11-14 11:11 ` [PATCH 5/7] parisc: " Qi Zheng
2025-11-14 11:11 ` [PATCH 6/7] um: " Qi Zheng
2025-11-14 11:11 ` [PATCH 7/7] mm: make PT_RECLAIM depend on MMU_GATHER_RCU_TABLE_FREE && 64BIT Qi Zheng
2025-11-15 0:51 ` kernel test robot
2025-11-15 1:12 ` kernel test robot
2025-11-17 16:57 ` David Hildenbrand (Red Hat)
2025-11-18 12:02 ` Qi Zheng
2025-11-19 10:19 ` David Hildenbrand (Red Hat)
2025-11-19 11:02 ` Qi Zheng
2025-11-19 11:35 ` David Hildenbrand (Red Hat)
2025-11-19 12:13 ` Qi Zheng
2025-11-19 12:24 ` David Hildenbrand (Red Hat)
2025-11-17 16:53 ` [PATCH 0/7] enable PT_RECLAIM on all 64-bit architectures David Hildenbrand (Red Hat)
2025-11-18 11:53 ` Qi Zheng [this message]
2025-11-19 10:13 ` David Hildenbrand (Red Hat)
2025-11-19 10:37 ` Qi Zheng
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