From patchwork Mon May 25 09:15:04 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: SeongJae Park X-Patchwork-Id: 11568393 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 18CBB912 for ; Mon, 25 May 2020 09:22:38 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id D94FF2078B for ; Mon, 25 May 2020 09:22:37 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=amazon.com header.i=@amazon.com header.b="nGP1I1IZ" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D94FF2078B Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=amazon.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 205988002B; Mon, 25 May 2020 05:22:37 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 1B6858E0003; Mon, 25 May 2020 05:22:37 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 0A6098002B; Mon, 25 May 2020 05:22:37 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0187.hostedemail.com [216.40.44.187]) by kanga.kvack.org (Postfix) with ESMTP id E26B58E0003 for ; Mon, 25 May 2020 05:22:36 -0400 (EDT) Received: from smtpin20.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id A8EF6181AC9C6 for ; Mon, 25 May 2020 09:22:36 +0000 (UTC) X-FDA: 76854701112.20.fish15_50f21e281b151 X-Spam-Summary: 1,0,0,,d41d8cd98f00b204,prvs=407e82f48=sjpark@amazon.com,,RULES_HIT:30054:30064,0,RBL:52.95.49.90:@amazon.com:.lbl8.mailshell.net-64.10.201.10 62.18.0.100,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fp,MSBL:0,DNSBL:neutral,Custom_rules:0:0:0,LFtime:22,LUA_SUMMARY:none X-HE-Tag: fish15_50f21e281b151 X-Filterd-Recvd-Size: 5834 Received: from smtp-fw-6002.amazon.com (smtp-fw-6002.amazon.com [52.95.49.90]) by imf08.hostedemail.com (Postfix) with ESMTP for ; Mon, 25 May 2020 09:22:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1590398556; x=1621934556; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version; bh=jUZsbPmvAGmVwdqxB6+MgEiReqycttXSdShcTa/idh8=; b=nGP1I1IZlwQ0RMD0Y0KpYER71AW844xTcaJTPtJ95l6aPycCPLGnFvTs e/WdBa+nwdE4QaFq63c6j/F5mLpQHdmjZKp8uGg8FUMKLXqJAdUZAquO/ qnTC2pwx+bR5DYpcPwJsxl+0t8xLatybsa4a6bCVV8x2hP+7RtUo4nGmV U=; IronPort-SDR: b6jn2DnH+PEQZY5XdpbpixeND6NeVqolEXlHPdDkH1h8Dsl6Xle/TtHAi7jK9rQkwFZkmkMPvv WaOXxreas2YQ== X-IronPort-AV: E=Sophos;i="5.73,432,1583193600"; d="scan'208";a="31957932" Received: from iad12-co-svc-p1-lb1-vlan3.amazon.com (HELO email-inbound-relay-1d-f273de60.us-east-1.amazon.com) ([10.43.8.6]) by smtp-border-fw-out-6002.iad6.amazon.com with ESMTP; 25 May 2020 09:22:35 +0000 Received: from EX13MTAUEA002.ant.amazon.com (iad55-ws-svc-p15-lb9-vlan2.iad.amazon.com [10.40.159.162]) by email-inbound-relay-1d-f273de60.us-east-1.amazon.com (Postfix) with ESMTPS id 21D35A2549; Mon, 25 May 2020 09:22:24 +0000 (UTC) Received: from EX13D31EUA001.ant.amazon.com (10.43.165.15) by EX13MTAUEA002.ant.amazon.com (10.43.61.77) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Mon, 25 May 2020 09:22:24 +0000 Received: from u886c93fd17d25d.ant.amazon.com (10.43.160.90) by EX13D31EUA001.ant.amazon.com (10.43.165.15) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Mon, 25 May 2020 09:22:09 +0000 From: SeongJae Park To: CC: SeongJae Park , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v13 07/15] mm/damon: Implement callbacks Date: Mon, 25 May 2020 11:15:04 +0200 Message-ID: <20200525091512.30391-8-sjpark@amazon.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200525091512.30391-1-sjpark@amazon.com> References: <20200525091512.30391-1-sjpark@amazon.com> MIME-Version: 1.0 X-Originating-IP: [10.43.160.90] X-ClientProxiedBy: EX13P01UWA002.ant.amazon.com (10.43.160.46) To EX13D31EUA001.ant.amazon.com (10.43.165.15) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: SeongJae Park This commit implements callbacks for DAMON. Using this, DAMON users can install their callbacks for each step of the access monitoring so that they can do something interesting with the monitored access patterns online. For example, callbacks can report the monitored patterns to users or do some access pattern based memory management such as proactive reclamations or access pattern based THP promotions/demotions decision makings. Signed-off-by: SeongJae Park Reviewed-by: Leonard Foerster --- include/linux/damon.h | 13 +++++++++++++ mm/damon.c | 4 ++++ 2 files changed, 17 insertions(+) diff --git a/include/linux/damon.h b/include/linux/damon.h index 7d59f57028ca..e77518dd7f0d 100644 --- a/include/linux/damon.h +++ b/include/linux/damon.h @@ -80,6 +80,15 @@ struct damon_task { * @kdamond_lock. Accesses to other fields must be protected by themselves. * * @tasks_list: Head of monitring target tasks (&damon_task) list. + * + * @sample_cb: Called for each sampling interval. + * @aggregate_cb: Called for each aggregation interval. + * + * @sample_cb and @aggregate_cb are called from @kdamond for each of the + * sampling intervals and aggregation intervals, respectively. Therefore, + * users can safely access to the monitoring results via @tasks_list without + * additional protection of @kdamond_lock. For the reason, users are + * recommended to use these callback for the accesses to the results. */ struct damon_ctx { unsigned long sample_interval; @@ -96,6 +105,10 @@ struct damon_ctx { struct mutex kdamond_lock; struct list_head tasks_list; /* 'damon_task' objects */ + + /* callbacks */ + void (*sample_cb)(struct damon_ctx *context); + void (*aggregate_cb)(struct damon_ctx *context); }; int damon_set_pids(struct damon_ctx *ctx, int *pids, ssize_t nr_pids); diff --git a/mm/damon.c b/mm/damon.c index a2be399ab0ab..98367c91596a 100644 --- a/mm/damon.c +++ b/mm/damon.c @@ -851,6 +851,8 @@ static int kdamond_fn(void *data) kdamond_init_regions(ctx); while (!kdamond_need_stop(ctx)) { kdamond_prepare_access_checks(ctx); + if (ctx->sample_cb) + ctx->sample_cb(ctx); usleep_range(ctx->sample_interval, ctx->sample_interval + 1); @@ -858,6 +860,8 @@ static int kdamond_fn(void *data) if (kdamond_aggregate_interval_passed(ctx)) { kdamond_merge_regions(ctx, max_nr_accesses / 10); + if (ctx->aggregate_cb) + ctx->aggregate_cb(ctx); kdamond_reset_aggregated(ctx); kdamond_split_regions(ctx); }