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Subject答复: [PATCH V4] mm/damon/reclaim: Fix the ti mer always stays active
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Hi, SJ
OK, I will modify it according to your comments

But I did checkpatch, there was no obvious style problem.
./scripts/checkpatch.pl --no-tree -f mm/damon/reclaim.c
total: 0 errors, 0 warnings, 425 lines checked
mm/damon/reclaim.c has no obvious style problems and is ready for submission.

Yours sincerely
Hailong

-----邮件原件-----
发件人: SeongJae Park <sj@kernel.org>
发送时间: 2022年4月21日 20:41
收件人: Hailong Tu <tuhailong@gmail.com>
抄送: akpm@linux-foundation.org; sj@kernel.org; torvalds@linux-foundation.org; gregkh@google.com; surenb@google.com; linux-mm@kvack.org; linux-kernel@vger.kernel.org; 涂海龙(Hailong) <tuhailong@oppo.com>; 李春鹏(punk li) <lichunpeng@oppo.com>; 邱长平(Aaron Qiu) <aaron.qiu@oppo.com>; 范国泽(Gordon) <fanguoze@oppo.com>; 王德锁(DeSuo) <wangdesuo@oppo.com>; 李志华(Terry) <lizhihua@oppo.com>
主题: Re: [PATCH V4] mm/damon/reclaim: Fix the timer always stays active

Hi Hailong,


On Thu, 21 Apr 2022 18:05:24 +0800 Hailong Tu <tuhailong@gmail.com> wrote:

> The timer stays active even if the reclaim mechanism is never enabled.
> It is unnecessary overhead can be completely avoided by using module_param_cb() for enabled flag.

As commented to the previous version[1], let's wrap the line at 75 columns.
checkpatch.pl is also complaining.

[1] https://lore.kernel.org/linux-mm/20220421084806.72553-1-sj@kernel.org/

>
> Signed-off-by: Hailong Tu <tuhailong@gmail.com>
> ---
> mm/damon/reclaim.c | 26 ++++++++++++++++++++++++--
> 1 file changed, 24 insertions(+), 2 deletions(-)
>
> diff --git a/mm/damon/reclaim.c b/mm/damon/reclaim.c index
> e34c4d0c4d93..e573e3f50064 100644
> --- a/mm/damon/reclaim.c
> +++ b/mm/damon/reclaim.c
> @@ -28,7 +28,6 @@
> * this.
> */
> static bool enabled __read_mostly;
> -module_param(enabled, bool, 0600);
>
> /*
> * Time threshold for cold memory regions identification in microseconds.
> @@ -358,11 +357,34 @@ static void damon_reclaim_timer_fn(struct work_struct *work)
> enabled = last_enabled;
> }
>
> - schedule_delayed_work(&damon_reclaim_timer,
> + if (enabled)
> + schedule_delayed_work(&damon_reclaim_timer,
> msecs_to_jiffies(ENABLE_CHECK_INTERVAL_MS));
> }
> static DECLARE_DELAYED_WORK(damon_reclaim_timer,
> damon_reclaim_timer_fn);
>
> +static int enabled_store(const char *val,
> + const struct kernel_param *kp)
> +{
> + int rc = param_set_bool(val, kp);
> +
> + if (rc < 0)
> + return rc;
> +
> + if (enabled)
> + schedule_delayed_work(&damon_reclaim_timer, 0);
> +
> + return 0;
> +}
> +
> +static const struct kernel_param_ops enabled_param_ops = {
> + .set = enabled_store,
> + .get = param_get_bool,
> +};
> +
> +module_param_cb(enabled, &enabled_param_ops, &enabled, 0600);
> +MODULE_PARM_DESC(enabled, "Enable or disable DAMON_RECLAIM (default:
> +disabled)");

I'd prefer 80 columns limit. Could you please put the string in the next line, like below?

MODULE_PARM_DESC(enabled,
"Enable or disable DAMON_RECLAIM (default: disabled)");


Thanks,
SJ

> +
> static int damon_reclaim_after_aggregation(struct damon_ctx *c) {
> struct damos *s;
> --
> 2.25.1
>
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