From patchwork Wed Dec 16 09:42:09 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: SeongJae Park X-Patchwork-Id: 11977121 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=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,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 E8F7CC4361B for ; Wed, 16 Dec 2020 09:43:28 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 2E84823105 for ; Wed, 16 Dec 2020 09:43:27 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2E84823105 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 1611C6B006C; Wed, 16 Dec 2020 04:43:27 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 1129F6B006E; Wed, 16 Dec 2020 04:43:27 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 030E96B0070; Wed, 16 Dec 2020 04:43:26 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0188.hostedemail.com [216.40.44.188]) by kanga.kvack.org (Postfix) with ESMTP id E1CE96B006C for ; Wed, 16 Dec 2020 04:43:26 -0500 (EST) Received: from smtpin17.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id A8E6E19451 for ; Wed, 16 Dec 2020 09:43:26 +0000 (UTC) X-FDA: 77598657612.17.brake18_0f11c152742b Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin17.hostedemail.com (Postfix) with ESMTP id 88E88180CF5E0 for ; Wed, 16 Dec 2020 09:43:26 +0000 (UTC) X-HE-Tag: brake18_0f11c152742b X-Filterd-Recvd-Size: 8653 Received: from smtp-fw-6002.amazon.com (smtp-fw-6002.amazon.com [52.95.49.90]) by imf34.hostedemail.com (Postfix) with ESMTP for ; Wed, 16 Dec 2020 09:43:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1608111806; x=1639647806; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version; bh=6T3WVe6Az0tu/tWkPM96Y026XUAvJ40yYSLrebOuGng=; b=rFdURPDJH3H5eBu/l2sAW5Eb/i5QiecIEAGjZ18xOk5QtiuTTCSkLVmJ cJhOpkJXXxnbkjPjO+35PrFoJOibOKTd0sBICjLQr9ywo311dOjwXb2h7 Sgl+HXrQ1jlPzjejnz/Snli0svEdss/TMQNZwn2rbT6NJBnSRW2FAecY5 4=; X-IronPort-AV: E=Sophos;i="5.78,424,1599523200"; d="scan'208";a="71565066" Received: from iad12-co-svc-p1-lb1-vlan2.amazon.com (HELO email-inbound-relay-1d-474bcd9f.us-east-1.amazon.com) ([10.43.8.2]) by smtp-border-fw-out-6002.iad6.amazon.com with ESMTP; 16 Dec 2020 09:43:18 +0000 Received: from EX13D31EUA001.ant.amazon.com (iad12-ws-svc-p26-lb9-vlan2.iad.amazon.com [10.40.163.34]) by email-inbound-relay-1d-474bcd9f.us-east-1.amazon.com (Postfix) with ESMTPS id C4B5AA1F1D; Wed, 16 Dec 2020 09:43:15 +0000 (UTC) Received: from u3f2cd687b01c55.ant.amazon.com (10.43.161.31) by EX13D31EUA001.ant.amazon.com (10.43.165.15) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 16 Dec 2020 09:42:59 +0000 From: SeongJae Park To: CC: SeongJae Park , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [RFC v10 01/13] damon/dbgfs: Allow users to set initial monitoring target regions Date: Wed, 16 Dec 2020 10:42:09 +0100 Message-ID: <20201216094221.11898-2-sjpark@amazon.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20201216094221.11898-1-sjpark@amazon.com> References: <20201216094221.11898-1-sjpark@amazon.com> MIME-Version: 1.0 X-Originating-IP: [10.43.161.31] X-ClientProxiedBy: EX13D16UWB001.ant.amazon.com (10.43.161.17) 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 Some 'damon-dbgfs' users would want to monitor only a part of the entire virtual memory address space. The framework users in the kernel space could use '->init_target_regions' callback or even set the regions inside the context struct as they want, but 'damon-dbgfs' users cannot. For the reason, this commit introduces a new debugfs file, 'init_region'. 'damon-dbgfs' users can specify which initial monitoring target address regions they want by writing special input to the file. The input should describe each region in each line in below form: Note that the regions will be updated to cover entire memory mapped regions after 'regions update interval'. If you want the regions to not be updated after the initial setting, you could set the interval as a very long time, say, a few decades. Signed-off-by: SeongJae Park --- mm/damon/dbgfs.c | 154 ++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 151 insertions(+), 3 deletions(-) diff --git a/mm/damon/dbgfs.c b/mm/damon/dbgfs.c index 06295c986dc3..2f1ec6ebd9f0 100644 --- a/mm/damon/dbgfs.c +++ b/mm/damon/dbgfs.c @@ -492,6 +492,147 @@ static ssize_t dbgfs_target_ids_write(struct file *file, return ret; } +static ssize_t sprint_init_regions(struct damon_ctx *c, char *buf, ssize_t len) +{ + struct damon_target *t; + struct damon_region *r; + int written = 0; + int rc; + + damon_for_each_target(t, c) { + damon_for_each_region(r, t) { + rc = scnprintf(&buf[written], len - written, + "%lu %lu %lu\n", + t->id, r->ar.start, r->ar.end); + if (!rc) + return -ENOMEM; + written += rc; + } + } + return written; +} + +static ssize_t dbgfs_init_regions_read(struct file *file, char __user *buf, + size_t count, loff_t *ppos) +{ + struct damon_ctx *ctx = file->private_data; + char *kbuf; + ssize_t len; + + kbuf = kmalloc(count, GFP_KERNEL); + if (!kbuf) + return -ENOMEM; + + mutex_lock(&ctx->kdamond_lock); + if (ctx->kdamond) { + mutex_unlock(&ctx->kdamond_lock); + return -EBUSY; + } + + len = sprint_init_regions(ctx, kbuf, count); + mutex_unlock(&ctx->kdamond_lock); + if (len < 0) + goto out; + len = simple_read_from_buffer(buf, count, ppos, kbuf, len); + +out: + kfree(kbuf); + return len; +} + +static int add_init_region(struct damon_ctx *c, + unsigned long target_id, struct damon_addr_range *ar) +{ + struct damon_target *t; + struct damon_region *r, *prev; + int rc = -EINVAL; + + if (ar->start >= ar->end) + return -EINVAL; + + damon_for_each_target(t, c) { + if (t->id == target_id) { + r = damon_new_region(ar->start, ar->end); + if (!r) + return -ENOMEM; + damon_add_region(r, t); + if (damon_nr_regions(t) > 1) { + prev = damon_prev_region(r); + if (prev->ar.end > r->ar.start) { + damon_destroy_region(r); + return -EINVAL; + } + } + rc = 0; + } + } + return rc; +} + +static int set_init_regions(struct damon_ctx *c, const char *str, ssize_t len) +{ + struct damon_target *t; + struct damon_region *r, *next; + int pos = 0, parsed, ret; + unsigned long target_id; + struct damon_addr_range ar; + int err; + + damon_for_each_target(t, c) { + damon_for_each_region_safe(r, next, t) + damon_destroy_region(r); + } + + while (pos < len) { + ret = sscanf(&str[pos], "%lu %lu %lu%n", + &target_id, &ar.start, &ar.end, &parsed); + if (ret != 3) + break; + err = add_init_region(c, target_id, &ar); + if (err) + goto fail; + pos += parsed; + } + + return 0; + +fail: + damon_for_each_target(t, c) { + damon_for_each_region_safe(r, next, t) + damon_destroy_region(r); + } + return err; +} + +static ssize_t dbgfs_init_regions_write(struct file *file, + const char __user *buf, size_t count, + loff_t *ppos) +{ + struct damon_ctx *ctx = file->private_data; + char *kbuf; + ssize_t ret = count; + int err; + + kbuf = user_input_str(buf, count, ppos); + if (IS_ERR(kbuf)) + return PTR_ERR(kbuf); + + mutex_lock(&ctx->kdamond_lock); + if (ctx->kdamond) { + ret = -EBUSY; + goto unlock_out; + } + + err = set_init_regions(ctx, kbuf, ret); + if (err) + ret = err; + +unlock_out: + mutex_unlock(&ctx->kdamond_lock); + kfree(kbuf); + return ret; +} + static ssize_t dbgfs_kdamond_pid_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) { @@ -553,6 +694,13 @@ static const struct file_operations target_ids_fops = { .write = dbgfs_target_ids_write, }; +static const struct file_operations init_regions_fops = { + .owner = THIS_MODULE, + .open = damon_dbgfs_open, + .read = dbgfs_init_regions_read, + .write = dbgfs_init_regions_write, +}; + static const struct file_operations kdamond_pid_fops = { .owner = THIS_MODULE, .open = damon_dbgfs_open, @@ -562,9 +710,9 @@ static const struct file_operations kdamond_pid_fops = { static int dbgfs_fill_ctx_dir(struct dentry *dir, struct damon_ctx *ctx) { const char * const file_names[] = {"attrs", "record", "schemes", - "target_ids", "kdamond_pid"}; - const struct file_operations *fops[] = {&attrs_fops, - &record_fops, &schemes_fops, &target_ids_fops, + "target_ids", "init_regions", "kdamond_pid"}; + const struct file_operations *fops[] = {&attrs_fops, &record_fops, + &schemes_fops, &target_ids_fops, &init_regions_fops, &kdamond_pid_fops}; int i;