linux-kernel - Re: [PATCH] RISC-V: only flush icache when it has VM

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Date: Wed, 10 Apr 2024 14:10:29 +0000
From: patchwork-bot+linux-riscv@...nel.org
To: Yangyu Chen <cyy@...self.name>
Cc: linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
 paul.walmsley@...ive.com, palmer@...belt.com, aou@...s.berkeley.edu,
 alexghiti@...osinc.com, conor.dooley@...rochip.com, jszhang@...nel.org,
 andrew@...ive.com
Subject: Re: [PATCH] RISC-V: only flush icache when it has VM_EXEC set

Hello:

This patch was applied to riscv/linux.git (for-next)
by Palmer Dabbelt <palmer@...osinc.com>:

On Wed, 10 Jan 2024 02:48:59 +0800 you wrote:
> As I-Cache flush on current RISC-V needs to send IPIs to every CPU cores
> in the system is very costly, limiting flush_icache_mm to be called only
> when vma->vm_flags has VM_EXEC can help minimize the frequency of these
> operations. It improves performance and reduces disturbances when
> copy_from_user_page is needed such as profiling with perf.
> 
> For I-D coherence concerns, it will not fail if such a page adds VM_EXEC
> flags in the future since we have checked it in the __set_pte_at function.
> 
> [...]

Here is the summary with links:
  - RISC-V: only flush icache when it has VM_EXEC set
    https://git.kernel.org/riscv/c/542124fc0d5c

You are awesome, thank you!
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