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[35.169.212.159]) by smtp.gmail.com with ESMTPSA id h4sm2133927qth.66.2021.06.08.04.53.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 08 Jun 2021 04:53:20 -0700 (PDT) From: SeongJae Park To: akpm@linux-foundation.org Cc: SeongJae Park , Jonathan.Cameron@Huawei.com, acme@kernel.org, alexander.shishkin@linux.intel.com, amit@kernel.org, benh@kernel.crashing.org, brendanhiggins@google.com, corbet@lwn.net, david@redhat.com, dwmw@amazon.com, elver@google.com, fan.du@intel.com, foersleo@amazon.de, greg@kroah.com, gthelen@google.com, guoju.fgj@alibaba-inc.com, jgowans@amazon.com, mgorman@suse.de, minchan@kernel.org, mingo@redhat.com, namhyung@kernel.org, peterz@infradead.org, riel@surriel.com, rientjes@google.com, rostedt@goodmis.org, rppt@kernel.org, shakeelb@google.com, shuah@kernel.org, sj38.park@gmail.com, snu@zelle79.org, vbabka@suse.cz, vdavydov.dev@gmail.com, zgf574564920@gmail.com, linux-damon@amazon.com, linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [RFC v2 04/14] mm/damon/dbgfs: Support schemes speed limit Date: Tue, 8 Jun 2021 11:52:44 +0000 Message-Id: <20210608115254.11930-5-sj38.park@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210608115254.11930-1-sj38.park@gmail.com> References: <20210608115254.11930-1-sj38.park@gmail.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: SeongJae Park This commit makes the debugfs interface of DAMON to support the schemes speed limit by chaning the format of the input for the schemes file. Signed-off-by: SeongJae Park --- mm/damon/dbgfs.c | 30 +++++++++++++++++++++++------- 1 file changed, 23 insertions(+), 7 deletions(-) diff --git a/mm/damon/dbgfs.c b/mm/damon/dbgfs.c index 4b45b69db697..ea6d4fdb57fa 100644 --- a/mm/damon/dbgfs.c +++ b/mm/damon/dbgfs.c @@ -227,11 +227,12 @@ static ssize_t sprint_schemes(struct damon_ctx *c, char *buf, ssize_t len) damon_for_each_scheme(s, c) { rc = scnprintf(&buf[written], len - written, - "%lu %lu %u %u %u %u %d %lu %lu\n", + "%lu %lu %u %u %u %u %d %lu %lu %lu %lu\n", s->min_sz_region, s->max_sz_region, s->min_nr_accesses, s->max_nr_accesses, s->min_age_region, s->max_age_region, - s->action, s->stat_count, s->stat_sz); + s->action, s->limit.sz, s->limit.ms, + s->stat_count, s->stat_sz); if (!rc) return -ENOMEM; @@ -312,10 +313,11 @@ static struct damos **str_to_schemes(const char *str, ssize_t len, while (pos < len && *nr_schemes < max_nr_schemes) { struct damos_speed_limit limit = {}; - ret = sscanf(&str[pos], "%lu %lu %u %u %u %u %u%n", + ret = sscanf(&str[pos], "%lu %lu %u %u %u %u %u %lu %lu%n", &min_sz, &max_sz, &min_nr_a, &max_nr_a, - &min_age, &max_age, &action, &parsed); - if (ret != 7) + &min_age, &max_age, &action, &limit.sz, + &limit.ms, &parsed); + if (ret != 9) break; if (!damos_action_valid(action)) { pr_err("wrong action %d\n", action); @@ -1133,6 +1135,15 @@ static ssize_t dbgfs_monitor_on_write(struct file *file, return ret; } +/* + * v1: Add the scheme speed limit + */ +static ssize_t dbgfs_version_read(struct file *file, + char __user *buf, size_t count, loff_t *ppos) +{ + return simple_read_from_buffer(buf, count, ppos, "1\n", 2); +} + static const struct file_operations mk_contexts_fops = { .owner = THIS_MODULE, .write = dbgfs_mk_context_write, @@ -1149,13 +1160,18 @@ static const struct file_operations monitor_on_fops = { .write = dbgfs_monitor_on_write, }; +static const struct file_operations version_fops = { + .owner = THIS_MODULE, + .read = dbgfs_version_read, +}; + static int __init __damon_dbgfs_init(void) { struct dentry *dbgfs_root; const char * const file_names[] = {"mk_contexts", "rm_contexts", - "monitor_on"}; + "monitor_on", "version"}; const struct file_operations *fops[] = {&mk_contexts_fops, - &rm_contexts_fops, &monitor_on_fops}; + &rm_contexts_fops, &monitor_on_fops, &version_fops}; int i; dbgfs_root = debugfs_create_dir("damon", NULL); -- 2.17.1