From patchwork Mon Feb 24 12:30:37 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: SeongJae Park X-Patchwork-Id: 11400369 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 CC58B14E3 for ; Mon, 24 Feb 2020 12:33:13 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 8F7EF2072D for ; Mon, 24 Feb 2020 12:33:13 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=amazon.com header.i=@amazon.com header.b="vQU69iBw" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8F7EF2072D 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 CA10B6B0008; Mon, 24 Feb 2020 07:33:12 -0500 (EST) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id C2B256B000A; Mon, 24 Feb 2020 07:33:12 -0500 (EST) 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 B196D6B000C; Mon, 24 Feb 2020 07:33:12 -0500 (EST) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0106.hostedemail.com [216.40.44.106]) by kanga.kvack.org (Postfix) with ESMTP id 9686D6B0008 for ; Mon, 24 Feb 2020 07:33:12 -0500 (EST) Received: from smtpin24.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 65A8C181AC9CB for ; Mon, 24 Feb 2020 12:33:12 +0000 (UTC) X-FDA: 76524960624.24.doll71_5623116f06c38 X-Spam-Summary: 1,0,0,,d41d8cd98f00b204,prvs=316760060=sjpark@amazon.com,,RULES_HIT:30003:30012:30034:30054:30056:30064:30070:30075,0,RBL:52.95.48.154:@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:25,LUA_SUMMARY:none X-HE-Tag: doll71_5623116f06c38 X-Filterd-Recvd-Size: 8506 Received: from smtp-fw-6001.amazon.com (smtp-fw-6001.amazon.com [52.95.48.154]) by imf20.hostedemail.com (Postfix) with ESMTP for ; Mon, 24 Feb 2020 12:33:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1582547591; x=1614083591; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version; bh=EGcEJRbbGsEtUIilzIaQFYsmyDgoXSe/+JcqjQByYJg=; b=vQU69iBwakzZEh3jBhjG5H1kEQpGk4emU/2vRwJp8Zr3l9un2i3Lb8ZS Aeej//VOdQ8iIIfTcDxkGW838lQXPPiSlcyOFr+hGLBxtMfNdAMB+SDOe RwVeiu+yqTAtbtV3SoSjOIeUIWK4yd0Wx9zK/aGCD6t/Zxk34KTeWeujV o=; IronPort-SDR: yFiYYgKkuu19Yi2T8fCS4ro0ts5AG1Z3wjVMFM+FuMbAOgXYN3WvWAaQcSwxDBdWCNj8cb6FML cDZcTKlvg/tA== X-IronPort-AV: E=Sophos;i="5.70,480,1574121600"; d="scan'208";a="19341225" Received: from iad12-co-svc-p1-lb1-vlan3.amazon.com (HELO email-inbound-relay-2a-6e2fc477.us-west-2.amazon.com) ([10.43.8.6]) by smtp-border-fw-out-6001.iad6.amazon.com with ESMTP; 24 Feb 2020 12:33:08 +0000 Received: from EX13MTAUEA002.ant.amazon.com (pdx4-ws-svc-p6-lb7-vlan2.pdx.amazon.com [10.170.41.162]) by email-inbound-relay-2a-6e2fc477.us-west-2.amazon.com (Postfix) with ESMTPS id 01AE1A26A7; Mon, 24 Feb 2020 12:33:06 +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 15.0.1236.3; Mon, 24 Feb 2020 12:33:06 +0000 Received: from u886c93fd17d25d.ant.amazon.com (10.43.162.53) by EX13D31EUA001.ant.amazon.com (10.43.165.15) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Mon, 24 Feb 2020 12:32:54 +0000 From: SeongJae Park To: CC: SeongJae Park , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v6 04/14] mm/damon: Apply dynamic memory mapping changes Date: Mon, 24 Feb 2020 13:30:37 +0100 Message-ID: <20200224123047.32506-5-sjpark@amazon.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200224123047.32506-1-sjpark@amazon.com> References: <20200224123047.32506-1-sjpark@amazon.com> MIME-Version: 1.0 X-Originating-IP: [10.43.162.53] X-ClientProxiedBy: EX13D19UWC003.ant.amazon.com (10.43.162.184) 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 Only a number of parts in the virtual address space of the processes is mapped to physical memory and accessed. Thus, tracking the unmapped address regions is just wasteful. However, tracking every memory mapping change might incur an overhead. For the reason, DAMON applies the dynamic memory mapping changes to the tracking regions only for each of a user-specified time interval (``regions update interval``). Signed-off-by: SeongJae Park --- mm/damon.c | 99 +++++++++++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 95 insertions(+), 4 deletions(-) diff --git a/mm/damon.c b/mm/damon.c index 1c8bb71bbce9..6a17408e83c2 100644 --- a/mm/damon.c +++ b/mm/damon.c @@ -59,17 +59,22 @@ struct damon_task { /* * For each 'sample_interval', DAMON checks whether each region is accessed or * not. It aggregates and keeps the access information (number of accesses to - * each region) for each 'aggr_interval' time. + * each region) for each 'aggr_interval' time. And for each + * 'regions_update_interval', damon checks whether the memory mapping of the + * target tasks has changed (e.g., by mmap() calls from the applications) and + * applies the changes. * * All time intervals are in micro-seconds. */ struct damon_ctx { unsigned long sample_interval; unsigned long aggr_interval; + unsigned long regions_update_interval; unsigned long min_nr_regions; unsigned long max_nr_regions; struct timespec64 last_aggregation; + struct timespec64 last_regions_update; struct task_struct *kdamond; bool kdamond_stop; @@ -671,6 +676,87 @@ static void kdamond_split_regions(struct damon_ctx *ctx) damon_split_regions_of(ctx, t); } +/* + * Check whether it is time to check and apply the dynamic mmap changes + * + * Returns true if it is. + */ +static bool kdamond_need_update_regions(struct damon_ctx *ctx) +{ + return damon_check_reset_time_interval(&ctx->last_regions_update, + ctx->regions_update_interval); +} + +static bool damon_intersect(struct damon_region *r, struct region *re) +{ + return !(r->vm_end <= re->start || re->end <= r->vm_start); +} + +/* + * Update damon regions for the three big regions of the given task + * + * t the given task + * bregions the three big regions of the task + */ +static void damon_apply_three_regions(struct damon_ctx *ctx, + struct damon_task *t, struct region bregions[3]) +{ + struct damon_region *r, *next; + unsigned int i = 0; + + /* Remove regions which isn't in the three big regions now */ + damon_for_each_region_safe(r, next, t) { + for (i = 0; i < 3; i++) { + if (damon_intersect(r, &bregions[i])) + break; + } + if (i == 3) + damon_destroy_region(r); + } + + /* Adjust intersecting regions to fit with the threee big regions */ + for (i = 0; i < 3; i++) { + struct damon_region *first = NULL, *last; + struct damon_region *newr; + struct region *br; + + br = &bregions[i]; + /* Get the first and last regions which intersects with br */ + damon_for_each_region(r, t) { + if (damon_intersect(r, br)) { + if (!first) + first = r; + last = r; + } + if (r->vm_start >= br->end) + break; + } + if (!first) { + /* no damon_region intersects with this big region */ + newr = damon_new_region(ctx, br->start, br->end); + damon_add_region(newr, damon_prev_region(r), r); + } else { + first->vm_start = br->start; + last->vm_end = br->end; + } + } +} + +/* + * Update regions for current memory mappings + */ +static void kdamond_update_regions(struct damon_ctx *ctx) +{ + struct region three_regions[3]; + struct damon_task *t; + + damon_for_each_task(ctx, t) { + if (damon_three_regions_of(t, three_regions)) + continue; + damon_apply_three_regions(ctx, t, three_regions); + } +} + /* * Check whether current monitoring should be stopped * @@ -735,6 +821,9 @@ static int kdamond_fn(void *data) kdamond_split_regions(ctx); } + if (kdamond_need_update_regions(ctx)) + kdamond_update_regions(ctx); + usleep_range(ctx->sample_interval, ctx->sample_interval + 1); } damon_for_each_task(ctx, t) { @@ -820,6 +909,7 @@ static int damon_set_pids(struct damon_ctx *ctx, * * sample_int time interval between samplings * aggr_int time interval between aggregations + * regions_update_int time interval between vma update checks * min_nr_reg minimal number of regions * max_nr_reg maximum number of regions * @@ -828,9 +918,9 @@ static int damon_set_pids(struct damon_ctx *ctx, * * Returns 0 on success, negative error code otherwise. */ -static int damon_set_attrs(struct damon_ctx *ctx, - unsigned long sample_int, unsigned long aggr_int, - unsigned long min_nr_reg, unsigned long max_nr_reg) +static int damon_set_attrs(struct damon_ctx *ctx, unsigned long sample_int, + unsigned long aggr_int, unsigned long regions_update_int, + unsigned long min_nr_reg, unsigned long max_nr_reg) { if (min_nr_reg < 3) { pr_err("min_nr_regions (%lu) should be bigger than 2\n", @@ -845,6 +935,7 @@ static int damon_set_attrs(struct damon_ctx *ctx, ctx->sample_interval = sample_int; ctx->aggr_interval = aggr_int; + ctx->regions_update_interval = regions_update_int; ctx->min_nr_regions = min_nr_reg; ctx->max_nr_regions = max_nr_reg; return 0;