linux-kernel - Re: [PATCH] Revert "mm/vunmap: add cond_resched() in vunmap_pmd

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Date:   Wed, 18 Nov 2020 11:06:49 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:     Minchan Kim <minchan@...nel.org>
Cc:     Christoph Hellwig <hch@...radead.org>,
        sergey.senozhatsky.work@...il.com, tony@...mide.com,
        linux-arm-kernel@...ts.infradead.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, linux-mm <linux-mm@...ck.org>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
        Harish Sriram <harish@...ux.ibm.com>, stable@...r.kernel.org
Subject: Re: [PATCH] Revert "mm/vunmap: add cond_resched() in
 vunmap_pmd_range"

On (20/11/17 12:29), Minchan Kim wrote:
> Yub, I remeber the discussion. 
> https://lore.kernel.org/linux-mm/20200416203736.GB50092@google.com/
> 
> I wanted to remove it but 30% gain made me think again before
> deciding to drop it.
> Since it continue to make problems and Linux is approaching to
> deprecate the 32bit machines, I think it would be better to drop it
> rather than inventing weird workaround.
> 
> Ccing Tony since omap2plus have used it by default for just in case.
> 
> From fc1b17a120991fd86b9e1153ab22d0b0bdadd8d0 Mon Sep 17 00:00:00 2001
> From: Minchan Kim <minchan@...nel.org>
> Date: Tue, 17 Nov 2020 11:58:51 -0800
> Subject: [PATCH] mm/zsmalloc.c: drop ZSMALLOC_PGTABLE_MAPPING
> 
> Even though this option showed some amount improvement(e.g., 30%)
> in some arm32 platforms, it has been headache to maintain since it
> have abused APIs[1](e.g., unmap_kernel_range in atomic context).
> 
> Since we are approaching to deprecate 32bit machines and already made
> the config option available for only builtin build since v5.8, lastly
> it has been not default option in zsmalloc, it's time to drop the
> option for better maintainance.
> 
> [1] http://lore.kernel.org/linux-mm/20201105170249.387069-1-minchan@kernel.org
> 
> Cc: Tony Lindgren <tony@...mide.com>
> Cc: Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
> Cc: Christoph Hellwig <hch@...radead.org>
> Cc: <stable@...r.kernel.org>
> Fixes: e47110e90584 ("mm/vunmap: add cond_resched() in vunmap_pmd_range")
> Signed-off-by: Minchan Kim <minchan@...nel.org>

Looks good to me.

Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>

	-ss