From patchwork Mon Apr 27 12:04:35 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: SeongJae Park X-Patchwork-Id: 11512003 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 8C3D213B2 for ; Mon, 27 Apr 2020 12:08:59 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 4B4B020663 for ; Mon, 27 Apr 2020 12:08:59 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=amazon.com header.i=@amazon.com header.b="fLBvj22t" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4B4B020663 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 713DA8E000B; Mon, 27 Apr 2020 08:08:58 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 6C4C18E0001; Mon, 27 Apr 2020 08:08:58 -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 5B3748E000B; Mon, 27 Apr 2020 08:08:58 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0096.hostedemail.com [216.40.44.96]) by kanga.kvack.org (Postfix) with ESMTP id 429F38E0001 for ; Mon, 27 Apr 2020 08:08:58 -0400 (EDT) Received: from smtpin28.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id F24D1180AD806 for ; Mon, 27 Apr 2020 12:08:57 +0000 (UTC) X-FDA: 76753513914.28.kitty93_3120de166c452 X-Spam-Summary: 1,0,0,,d41d8cd98f00b204,prvs=379a2d796=sjpark@amazon.com,,RULES_HIT:30003:30012:30034:30051:30054:30064:30070:30075,0,RBL:52.95.49.90:@amazon.com:.lbl8.mailshell.net-62.18.0.100 64.10.201.10,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:23,LUA_SUMMARY:none X-HE-Tag: kitty93_3120de166c452 X-Filterd-Recvd-Size: 10080 Received: from smtp-fw-6002.amazon.com (smtp-fw-6002.amazon.com [52.95.49.90]) by imf18.hostedemail.com (Postfix) with ESMTP for ; Mon, 27 Apr 2020 12:08:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1587989338; x=1619525338; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version; bh=DE1OnifYiXqw9Om7Vnyy3tf4L5PRElje19LPPu8+r8w=; b=fLBvj22tO93Z4jI/Yzs8SxlyPdN788pFH0D5oImz8gqy/SdA0BystRo8 pfW3xtf9kPyim2rcbpQ0VIeimISqBu2q/DG2x/95I9ThP+ac2xD5irAgT tZbs9hhoDjKduTWc7cST6L7wZSUtLBjww7o39tW2xLJX6Uvtbnj5yUdCE g=; IronPort-SDR: 6n+gskDtQxCEeeAUGOeucIh80bubTS2Fj8gzEHZFCwRC/P6JHy5jaMsjA37c7nkDPaUR9j0cq0 OregcYHKWmew== X-IronPort-AV: E=Sophos;i="5.73,324,1583193600"; d="scan'208";a="27431295" Received: from iad12-co-svc-p1-lb1-vlan3.amazon.com (HELO email-inbound-relay-2a-f14f4a47.us-west-2.amazon.com) ([10.43.8.6]) by smtp-border-fw-out-6002.iad6.amazon.com with ESMTP; 27 Apr 2020 12:08:43 +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-f14f4a47.us-west-2.amazon.com (Postfix) with ESMTPS id CDFE4A18D5; Mon, 27 Apr 2020 12:08:39 +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, 27 Apr 2020 12:08:39 +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 15.0.1497.2; Mon, 27 Apr 2020 12:08:23 +0000 From: SeongJae Park To: CC: SeongJae Park , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v9 08/15] mm/damon: Implement access pattern recording Date: Mon, 27 Apr 2020 14:04:35 +0200 Message-ID: <20200427120442.24179-9-sjpark@amazon.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200427120442.24179-1-sjpark@amazon.com> References: <20200427120442.24179-1-sjpark@amazon.com> MIME-Version: 1.0 X-Originating-IP: [10.43.162.53] X-ClientProxiedBy: EX13D34UWC004.ant.amazon.com (10.43.162.155) 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 the recording feature of DAMON. If this feature is enabled, DAMON writes the monitored access patterns in its binary format into a file which specified by the user. This is already able to be implemented by each user using the callbacks. However, as the recording is expected to be used widely, this commit implements the feature in the DAMON, for more convenience and efficiency. Signed-off-by: SeongJae Park --- include/linux/damon.h | 7 +++ mm/damon.c | 131 +++++++++++++++++++++++++++++++++++++++++- 2 files changed, 135 insertions(+), 3 deletions(-) diff --git a/include/linux/damon.h b/include/linux/damon.h index 264569b21502..bc46ea00e9a1 100644 --- a/include/linux/damon.h +++ b/include/linux/damon.h @@ -50,6 +50,11 @@ struct damon_ctx { struct timespec64 last_aggregation; struct timespec64 last_regions_update; + unsigned char *rbuf; + unsigned int rbuf_len; + unsigned int rbuf_offset; + char *rfile_path; + struct task_struct *kdamond; bool kdamond_stop; struct mutex kdamond_lock; @@ -65,6 +70,8 @@ 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_recording(struct damon_ctx *ctx, + unsigned int rbuf_len, char *rfile_path); int damon_start(struct damon_ctx *ctx); int damon_stop(struct damon_ctx *ctx); diff --git a/mm/damon.c b/mm/damon.c index 863b60e16a4a..621217b58173 100644 --- a/mm/damon.c +++ b/mm/damon.c @@ -44,6 +44,9 @@ #define damon_for_each_task_safe(ctx, t, next) \ list_for_each_entry_safe(t, next, &(ctx)->tasks_list, list) +#define MAX_RECORD_BUFFER_LEN (4 * 1024 * 1024) +#define MAX_RFILE_PATH_LEN 256 + /* Get a random number in [l, r) */ #define damon_rand(l, r) (l + prandom_u32() % (r - l)) @@ -565,16 +568,80 @@ static bool kdamond_aggregate_interval_passed(struct damon_ctx *ctx) } /* - * Reset the aggregated monitoring results + * Flush the content in the result buffer to the result file + */ +static void damon_flush_rbuffer(struct damon_ctx *ctx) +{ + ssize_t sz; + loff_t pos = 0; + struct file *rfile; + + rfile = filp_open(ctx->rfile_path, O_CREAT | O_RDWR | O_APPEND, 0644); + if (IS_ERR(rfile)) { + pr_err("Cannot open the result file %s\n", + ctx->rfile_path); + return; + } + + while (ctx->rbuf_offset) { + sz = kernel_write(rfile, ctx->rbuf, ctx->rbuf_offset, &pos); + if (sz < 0) + break; + ctx->rbuf_offset -= sz; + } + filp_close(rfile, NULL); +} + +/* + * Write a data into the result buffer + */ +static void damon_write_rbuf(struct damon_ctx *ctx, void *data, ssize_t size) +{ + if (!ctx->rbuf_len || !ctx->rbuf) + return; + if (ctx->rbuf_offset + size > ctx->rbuf_len) + damon_flush_rbuffer(ctx); + + memcpy(&ctx->rbuf[ctx->rbuf_offset], data, size); + ctx->rbuf_offset += size; +} + +/* + * Flush the aggregated monitoring results to the result buffer + * + * Stores current tracking results to the result buffer and reset 'nr_accesses' + * of each region. The format for the result buffer is as below: + * + *