linux-kernel - Re: [PATCH v4 5/8] parisc: mm: enable MMU_GATHER_RCU_TABLE

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Message-ID: <7e31fe0b-c321-4f09-9d7a-19d22851129c@gmx.de>
Date: Sat, 7 Feb 2026 03:34:20 +0100
From: Helge Deller <deller@....de>
To: Qi Zheng <qi.zheng@...ux.dev>
Cc: linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-mm@...ck.org, linux-parisc@...r.kernel.org,
 Qi Zheng <zhengqi.arch@...edance.com>
Subject: Re: [PATCH v4 5/8] parisc: mm: enable MMU_GATHER_RCU_TABLE_FREE

On 1/27/26 13:12, Qi Zheng wrote:
> From: Qi Zheng <zhengqi.arch@...edance.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@...edance.com>
> Cc: "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>
> Cc: Helge Deller <deller@....de>
> ---
>   arch/parisc/Kconfig           | 1 +
>   arch/parisc/include/asm/tlb.h | 4 ++--
>   2 files changed, 3 insertions(+), 2 deletions(-)

Acked-by: Helge Deller <deller@....de>   # parisc
Tested-by: Helge Deller <deller@....de>  # parisc

Thanks!
Helge