From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5FDE8C433EF for ; Mon, 30 May 2022 16:56:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242216AbiE3Q44 (ORCPT ); Mon, 30 May 2022 12:56:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45176 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238922AbiE3Q4y (ORCPT ); Mon, 30 May 2022 12:56:54 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BAD414FC7C for ; Mon, 30 May 2022 09:56:51 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 56D6E6119F for ; Mon, 30 May 2022 16:56:51 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 397C9C385B8; Mon, 30 May 2022 16:56:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1653929810; bh=D0OLsrOL0CSZt0TW+pAzxo6uAd6kEtYLd7cEs1qfllU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RD4I0Tq4cVWE338ctzZB15LZHOxGr6Eoc1UIM6WFCB4/4s+yLSoQH2IWN/2XQICf5 2p6kX0/xkzZLIQc6WyVXmTyGypmRltZmBslh3LOWHLfKPieFA8OTLonvOfhSW1qNmk ndC+WohUtRkBPt2VkyLvD5fH1IjPvJg1+KbWTPeheXTBtQOKt4O9glBI1FJqACtPVl 9zTKJcV9OZgH398Lsm7uaYBJup+LbVifWbaFK3IRKbMuw9eG8FjhR6WwOIZ7cB++8w q9Z4zoVgsutKdZV90TjmsICUcniwPmoXtCMAxRvITQuvX/BgMD/RaX9XBRMy93ZOHI oxdsiMSMG8TQg== From: SeongJae Park To: Chengming Zhou Cc: sj@kernel.org, damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] mm/damon: remove obsolete comments of kdamond_stop Date: Mon, 30 May 2022 16:56:48 +0000 Message-Id: <20220530165648.2921-1-sj@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220530022016.11771-1-zhouchengming@bytedance.com> References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Chengming, On Mon, 30 May 2022 10:20:16 +0800 Chengming Zhou wrote: > Since commit 0f91d13366a4 ("mm/damon: simplify stop mechanism") > delete kdamond_stop and change to use kthread stop mechanism, > these obsolete comments should be removed accordingly. Good point, thank you! > > Signed-off-by: Chengming Zhou > --- > include/linux/damon.h | 17 ++++++++--------- > 1 file changed, 8 insertions(+), 9 deletions(-) > > diff --git a/include/linux/damon.h b/include/linux/damon.h > index 7c62da31ce4b..fa1c2968b1dd 100644 > --- a/include/linux/damon.h > +++ b/include/linux/damon.h > @@ -397,7 +397,6 @@ struct damon_callback { > * detail. > * > * @kdamond: Kernel thread who does the monitoring. > - * @kdamond_stop: Notifies whether kdamond should stop. > * @kdamond_lock: Mutex for the synchronizations with @kdamond. > * > * For each monitoring context, one kernel thread for the monitoring is > @@ -406,14 +405,14 @@ struct damon_callback { > * Once started, the monitoring thread runs until explicitly required to be > * terminated or every monitoring target is invalid. The validity of the > * targets is checked via the &damon_operations.target_valid of @ops. The > - * termination can also be explicitly requested by writing non-zero to > - * @kdamond_stop. The thread sets @kdamond to NULL when it terminates. > - * Therefore, users can know whether the monitoring is ongoing or terminated by > - * reading @kdamond. Reads and writes to @kdamond and @kdamond_stop from > - * outside of the monitoring thread must be protected by @kdamond_lock. > - * > - * Note that the monitoring thread protects only @kdamond and @kdamond_stop via > - * @kdamond_lock. Accesses to other fields must be protected by themselves. > + * termination can also be explicitly requested by calling __damon_stop(). '__damon_stop()' is a static function, so mentioning that here makes no sense. Let's mention its wrapper, 'damon_stop()' instead. After the change, you could add Reviewed-by: SeongJae Park Thanks, SJ > + * The thread sets @kdamond to NULL when it terminates. Therefore, users can > + * know whether the monitoring is ongoing or terminated by reading @kdamond. > + * Reads and writes to @kdamond from outside of the monitoring thread must > + * be protected by @kdamond_lock. > + * > + * Note that the monitoring thread protects only @kdamond via @kdamond_lock. > + * Accesses to other fields must be protected by themselves. > * > * @ops: Set of monitoring operations for given use cases. > * @callback: Set of callbacks for monitoring events notifications. > -- > 2.36.1