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 X-Spam-Level: X-Spam-Status: No, score=-10.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2A4D5C47255 for ; Mon, 11 May 2020 12:37:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EEC6020746 for ; Mon, 11 May 2020 12:37:50 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=amazon.com header.i=@amazon.com header.b="DbELwaiE" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730095AbgEKMhu (ORCPT ); Mon, 11 May 2020 08:37:50 -0400 Received: from smtp-fw-33001.amazon.com ([207.171.190.10]:51339 "EHLO smtp-fw-33001.amazon.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727994AbgEKMht (ORCPT ); Mon, 11 May 2020 08:37:49 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1589200669; x=1620736669; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version; bh=3qzhEO45OCs2xK7YXoqTIw9W4rei20Zjp8AHQQpGetw=; b=DbELwaiEUOXUdXMnMWAftRS3mMEyp8FRSzvxtOqBXUOgWwpryO1jA9kF 8LKAdnrWTBY9Y+pECtX3tMXqu3V4UZaS6z2vdTe7McvFA1ODxFA4kGp2j D7Q3/xEu4MaUFroohH3FZ+eWLeAkSKCxgLQzXmPePHfNqBym3CP8j5K1T s=; IronPort-SDR: ijEDsp/2QAQashspAjWy4I7QTeWERsghd33wV575sjyRQpFaalMCuVZTTCmxztYXlWMYowWyGA DFMl5rNxfuRg== X-IronPort-AV: E=Sophos;i="5.73,380,1583193600"; d="scan'208";a="43930682" Received: from sea32-co-svc-lb4-vlan2.sea.corp.amazon.com (HELO email-inbound-relay-1a-af6a10df.us-east-1.amazon.com) ([10.47.23.34]) by smtp-border-fw-out-33001.sea14.amazon.com with ESMTP; 11 May 2020 12:37:47 +0000 Received: from EX13MTAUEA002.ant.amazon.com (iad55-ws-svc-p15-lb9-vlan3.iad.amazon.com [10.40.159.166]) by email-inbound-relay-1a-af6a10df.us-east-1.amazon.com (Postfix) with ESMTPS id D4E0DA1FD2; Mon, 11 May 2020 12:37:35 +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, 11 May 2020 12:37:35 +0000 Received: from u886c93fd17d25d.ant.amazon.com (10.43.161.253) by EX13D31EUA001.ant.amazon.com (10.43.165.15) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Mon, 11 May 2020 12:37:19 +0000 From: SeongJae Park To: CC: SeongJae Park , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v11 08/16] mm/damon: Implement callbacks Date: Mon, 11 May 2020 14:32:54 +0200 Message-ID: <20200511123302.12520-9-sjpark@amazon.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200511123302.12520-1-sjpark@amazon.com> References: <20200511123302.12520-1-sjpark@amazon.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.43.161.253] X-ClientProxiedBy: EX13D06UWC001.ant.amazon.com (10.43.162.91) To EX13D31EUA001.ant.amazon.com (10.43.165.15) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- include/linux/damon.h | 4 ++++ mm/damon.c | 4 ++++ 2 files changed, 8 insertions(+) diff --git a/include/linux/damon.h b/include/linux/damon.h index 62b9f90ed87b..264569b21502 100644 --- a/include/linux/damon.h +++ b/include/linux/damon.h @@ -55,6 +55,10 @@ 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 3d0f9428c925..6b01aa641503 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); } -- 2.17.1