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=-9.9 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=unavailable 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 33D83C433DF for ; Tue, 16 Jun 2020 07:41:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 056F520663 for ; Tue, 16 Jun 2020 07:41:08 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=amazon.com header.i=@amazon.com header.b="qVq7FWwC" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727779AbgFPHlH (ORCPT ); Tue, 16 Jun 2020 03:41:07 -0400 Received: from smtp-fw-4101.amazon.com ([72.21.198.25]:17460 "EHLO smtp-fw-4101.amazon.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725901AbgFPHlG (ORCPT ); Tue, 16 Jun 2020 03:41:06 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1592293264; x=1623829264; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version; bh=6KU6gaVnWcf/hGK+sRWKevmnLP0tqCZId6cFkB9vhYI=; b=qVq7FWwC/DgqZV8RM/hPKOEbCeig0vHPP2/XCd4ZJN46dKXPYR/1/crx SvlRBK1hP9L5uikZO7hEVaQKp9Ja7bHsHZ/rZ/I0EZhiYi/eO4ofV1Yka fnHMRIKluto+m+NFSmgYHjpvwCLdvdIZu5yXBYw600Ar1GssL8qdgVvb7 E=; IronPort-SDR: O07VYzorMkpY0s2ePL+RHNOuW81ARdqWpZ9VzF26dy7ue4w7AfxcbOdvkKUL7C3T9z9iaJQ3fV STpZwUtkPILw== X-IronPort-AV: E=Sophos;i="5.73,518,1583193600"; d="scan'208";a="36517910" Received: from iad12-co-svc-p1-lb1-vlan3.amazon.com (HELO email-inbound-relay-2b-55156cd4.us-west-2.amazon.com) ([10.43.8.6]) by smtp-border-fw-out-4101.iad4.amazon.com with ESMTP; 16 Jun 2020 07:41:00 +0000 Received: from EX13MTAUEA002.ant.amazon.com (pdx4-ws-svc-p6-lb7-vlan2.pdx.amazon.com [10.170.41.162]) by email-inbound-relay-2b-55156cd4.us-west-2.amazon.com (Postfix) with ESMTPS id 13AE4A1C20; Tue, 16 Jun 2020 07:40:57 +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; Tue, 16 Jun 2020 07:40:56 +0000 Received: from u886c93fd17d25d.ant.amazon.com (10.43.162.248) by EX13D31EUA001.ant.amazon.com (10.43.165.15) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Tue, 16 Jun 2020 07:40:30 +0000 From: SeongJae Park To: CC: SeongJae Park , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [RFC v12 3/8] mm/damon: Implement data access monitoring-based operation schemes Date: Tue, 16 Jun 2020 09:38:23 +0200 Message-ID: <20200616073828.16509-4-sjpark@amazon.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200616073828.16509-1-sjpark@amazon.com> References: <20200616073828.16509-1-sjpark@amazon.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.43.162.248] X-ClientProxiedBy: EX13D22UWC004.ant.amazon.com (10.43.162.198) 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 In many cases, users might use DAMON for simple data access aware memory management optimizations such as applying an operation scheme to a memory region of a specific size having a specific access frequency for a specific time. For example, "page out a memory region larger than 100 MiB but having a low access frequency more than 10 minutes", or "Use THP for a memory region larger than 2 MiB having a high access frequency for more than 2 seconds". Most simple form of the solution would be doing offline data access pattern profiling using DAMON and modifying the application source code or system configuration based on the profiling results. Or, developing a daemon constructed with two modules (one for access monitoring and the other for applying memory management actions via mlock(), madvise(), sysctl, etc) is imaginable. To minimize users from spending their time for implementation of such simple data access monitoring-based operation schemes, this commit makes DAMON to handle such schemes directly. With this commit, users can simply specify their desired schemes to DAMON. Then, DAMON will automatically apply the schemes to the the user-specified target processes. Each of the schemes is composed with conditions for filtering of the target memory regions and desired memory management action for the target. Specifically, the format is:: The filtering conditions are size of memory region, number of accesses to the region monitored by DAMON, and the age of the region. The age of region is incremented periodically but reset when its addresses or access frequency has significantly changed or the action of a scheme was applied. For the action, current implementation supports only a few of madvise() hints, ``MADV_WILLNEED``, ``MADV_COLD``, ``MADV_PAGEOUT``, ``MADV_HUGEPAGE``, and ``MADV_NOHUGEPAGE``. Signed-off-by: SeongJae Park --- include/linux/damon.h | 50 ++++++++++++++ mm/damon.c | 149 ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 199 insertions(+) diff --git a/include/linux/damon.h b/include/linux/damon.h index 2e0eff17a214..928cda0ed509 100644 --- a/include/linux/damon.h +++ b/include/linux/damon.h @@ -64,6 +64,52 @@ struct damon_task { struct list_head list; }; +/** + * enum damos_action - Represents an action of a Data Access Monitoring-based + * Operation Scheme. + * + * @DAMOS_WILLNEED: Call ``madvise()`` for the region with MADV_WILLNEED. + * @DAMOS_COLD: Call ``madvise()`` for the region with MADV_COLD. + * @DAMOS_PAGEOUT: Call ``madvise()`` for the region with MADV_PAGEOUT. + * @DAMOS_HUGEPAGE: Call ``madvise()`` for the region with MADV_HUGEPAGE. + * @DAMOS_NOHUGEPAGE: Call ``madvise()`` for the region with MADV_NOHUGEPAGE. + * @DAMOS_ACTION_LEN: Number of supported actions. + */ +enum damos_action { + DAMOS_WILLNEED, + DAMOS_COLD, + DAMOS_PAGEOUT, + DAMOS_HUGEPAGE, + DAMOS_NOHUGEPAGE, + DAMOS_ACTION_LEN, +}; + +/** + * struct damos - Represents a Data Access Monitoring-based Operation Scheme. + * @min_sz_region: Minimum size of target regions. + * @max_sz_region: Maximum size of target regions. + * @min_nr_accesses: Minimum ``->nr_accesses`` of target regions. + * @max_nr_accesses: Maximum ``->nr_accesses`` of target regions. + * @min_age_region: Minimum age of target regions. + * @max_age_region: Maximum age of target regions. + * @action: &damo_action to be applied to the target regions. + * @list: List head for siblings. + * + * For each aggregation interval, DAMON applies @action to monitoring target + * regions fit in the condition and updates the statistics. Note that both + * the minimums and the maximums are inclusive. + */ +struct damos { + unsigned int min_sz_region; + unsigned int max_sz_region; + unsigned int min_nr_accesses; + unsigned int max_nr_accesses; + unsigned int min_age_region; + unsigned int max_age_region; + enum damos_action action; + struct list_head list; +}; + /** * struct damon_ctx - Represents a context for each monitoring. This is the * main interface that allows users to set the attributes and get the results @@ -107,6 +153,7 @@ struct damon_task { * @kdamond_lock. Accesses to other fields must be protected by themselves. * * @tasks_list: Head of monitoring target tasks (&damon_task) list. + * @schemes_list: Head of schemes (&damos) list. * * @init_target_regions: Constructs initial monitoring target regions. * @update_target_regions: Updates monitoring target regions. @@ -157,6 +204,7 @@ struct damon_ctx { struct mutex kdamond_lock; struct list_head tasks_list; /* 'damon_task' objects */ + struct list_head schemes_list; /* 'damos' objects */ /* callbacks */ void (*init_target_regions)(struct damon_ctx *context); @@ -177,6 +225,8 @@ int damon_set_pids(struct damon_ctx *ctx, int *pids, ssize_t nr_pids); 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); +int damon_set_schemes(struct damon_ctx *ctx, + struct damos **schemes, ssize_t nr_schemes); int damon_set_recording(struct damon_ctx *ctx, unsigned int rbuf_len, char *rfile_path); int damon_start(struct damon_ctx *ctx); diff --git a/mm/damon.c b/mm/damon.c index 6a83931d4795..53d30abee6b7 100644 --- a/mm/damon.c +++ b/mm/damon.c @@ -22,6 +22,7 @@ #define CREATE_TRACE_POINTS +#include #include #include #include @@ -67,6 +68,12 @@ #define damon_for_each_task_safe(t, next, ctx) \ list_for_each_entry_safe(t, next, &(ctx)->tasks_list, list) +#define damon_for_each_scheme(s, ctx) \ + list_for_each_entry(s, &(ctx)->schemes_list, list) + +#define damon_for_each_scheme_safe(s, next, ctx) \ + list_for_each_entry_safe(s, next, &(ctx)->schemes_list, list) + #define MAX_RECORD_BUFFER_LEN (4 * 1024 * 1024) #define MAX_RFILE_PATH_LEN 256 @@ -186,6 +193,27 @@ static void damon_destroy_task(struct damon_task *t) damon_free_task(t); } +static void damon_add_scheme(struct damon_ctx *ctx, struct damos *s) +{ + list_add_tail(&s->list, &ctx->schemes_list); +} + +static void damon_del_scheme(struct damos *s) +{ + list_del(&s->list); +} + +static void damon_free_scheme(struct damos *s) +{ + kfree(s); +} + +static void damon_destroy_scheme(struct damos *s) +{ + damon_del_scheme(s); + damon_free_scheme(s); +} + static unsigned int nr_damon_tasks(struct damon_ctx *ctx) { struct damon_task *t; @@ -815,6 +843,101 @@ static void kdamond_reset_aggregated(struct damon_ctx *c) } } +#ifndef CONFIG_ADVISE_SYSCALLS +static int damos_madvise(struct damon_task *task, struct damon_region *r, + int behavior) +{ + return -EINVAL; +} +#else +static int damos_madvise(struct damon_task *task, struct damon_region *r, + int behavior) +{ + struct task_struct *t; + struct mm_struct *mm; + int ret = -ENOMEM; + + t = damon_get_task_struct(task); + if (!t) + goto out; + mm = damon_get_mm(task); + if (!mm) + goto put_task_out; + + ret = do_madvise(t, mm, PAGE_ALIGN(r->ar.start), + PAGE_ALIGN(r->ar.end - r->ar.start), behavior); + mmput(mm); +put_task_out: + put_task_struct(t); +out: + return ret; +} +#endif /* CONFIG_ADVISE_SYSCALLS */ + +static int damos_do_action(struct damon_task *task, struct damon_region *r, + enum damos_action action) +{ + int madv_action; + + switch (action) { + case DAMOS_WILLNEED: + madv_action = MADV_WILLNEED; + break; + case DAMOS_COLD: + madv_action = MADV_COLD; + break; + case DAMOS_PAGEOUT: + madv_action = MADV_PAGEOUT; + break; + case DAMOS_HUGEPAGE: + madv_action = MADV_HUGEPAGE; + break; + case DAMOS_NOHUGEPAGE: + madv_action = MADV_NOHUGEPAGE; + break; + default: + pr_warn("Wrong action %d\n", action); + return -EINVAL; + } + + return damos_madvise(task, r, madv_action); +} + +static void damon_do_apply_schemes(struct damon_ctx *c, struct damon_task *t, + struct damon_region *r) +{ + struct damos *s; + unsigned long sz; + + damon_for_each_scheme(s, c) { + sz = r->ar.end - r->ar.start; + if ((s->min_sz_region && sz < s->min_sz_region) || + (s->max_sz_region && s->max_sz_region < sz)) + continue; + if ((s->min_nr_accesses && r->nr_accesses < s->min_nr_accesses) + || (s->max_nr_accesses && + s->max_nr_accesses < r->nr_accesses)) + continue; + if ((s->min_age_region && r->age < s->min_age_region) || + (s->max_age_region && + s->max_age_region < r->age)) + continue; + damos_do_action(t, r, s->action); + r->age = 0; + } +} + +static void kdamond_apply_schemes(struct damon_ctx *c) +{ + struct damon_task *t; + struct damon_region *r; + + damon_for_each_task(t, c) { + damon_for_each_region(r, t) + damon_do_apply_schemes(c, t, r); + } +} + #define sz_damon_region(r) (r->ar.end - r->ar.start) /* @@ -1052,6 +1175,7 @@ static int kdamond_fn(void *data) ctx->aggregate_cb(ctx); kdamond_merge_regions(ctx, max_nr_accesses / 10, sz_limit); + kdamond_apply_schemes(ctx); kdamond_reset_aggregated(ctx); kdamond_split_regions(ctx); } @@ -1135,6 +1259,30 @@ int damon_stop(struct damon_ctx *ctx) return -EPERM; } +/** + * damon_set_schemes() - Set data access monitoring based operation schemes. + * @ctx: monitoring context + * @schemes: array of the schemes + * @nr_schemes: number of entries in @schemes + * + * This function should not be called while the kdamond of the context is + * running. + * + * Return: 0 if success, or negative error code otherwise. + */ +int damon_set_schemes(struct damon_ctx *ctx, struct damos **schemes, + ssize_t nr_schemes) +{ + struct damos *s, *next; + ssize_t i; + + damon_for_each_scheme_safe(s, next, ctx) + damon_destroy_scheme(s); + for (i = 0; i < nr_schemes; i++) + damon_add_scheme(ctx, schemes[i]); + return 0; +} + /** * damon_set_pids() - Set monitoring target processes. * @ctx: monitoring context @@ -1593,6 +1741,7 @@ static int __init damon_init_user_ctx(void) mutex_init(&ctx->kdamond_lock); INIT_LIST_HEAD(&ctx->tasks_list); + INIT_LIST_HEAD(&ctx->schemes_list); return 0; } -- 2.17.1