linux-kernel - Re: [PATCH V2] mm/damon: simplify damon_ctx check in damon_sysfs_before

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Date:   Thu,  8 Sep 2022 18:01:15 +0000
From:   SeongJae Park <sj@...nel.org>
To:     Xin Hao <xhao@...ux.alibaba.com>
Cc:     sj@...nel.org, akpm@...ux-foundation.org, damon@...ts.linux.dev,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2] mm/damon: simplify damon_ctx check in damon_sysfs_before_terminate

Just for a record.  Apparently Andrew has already added this in mm:
https://lore.kernel.org/mm-commits/20220907223146.C7CF4C433D6@smtp.kernel.org/


Thanks,
SJ

On Thu, 8 Sep 2022 10:19:12 +0800 Xin Hao <xhao@...ux.alibaba.com> wrote:

> In damon_sysfs_before_terminate() func, it need to check whether
> ctx->ops.id supports 'DAMON_OPS_VADDR' or 'DAMON_OPS_FVADDR', there we
> can use damon_target_has_pid() instead.
> 
> Signed-off-by: Xin Hao <xhao@...ux.alibaba.com>
> Reviewed-by: SeongJae Park <sj@...nel.org>
> ---
>  mm/damon/sysfs.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c
> index 7488e27c87c3..88f208ff235d 100644
> --- a/mm/damon/sysfs.c
> +++ b/mm/damon/sysfs.c
> @@ -2309,7 +2309,7 @@ static void damon_sysfs_before_terminate(struct damon_ctx *ctx)
>  {
>  	struct damon_target *t, *next;
> 
> -	if (ctx->ops.id != DAMON_OPS_VADDR && ctx->ops.id != DAMON_OPS_FVADDR)
> +	if (!damon_target_has_pid(ctx))
>  		return;
> 
>  	mutex_lock(&ctx->kdamond_lock);
> --
> 2.31.0