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Date: Tue, 20 Jul 2021 13:12:59 +0000 From: SeongJae Park <sj38.park@...il.com> To: akpm@...ux-foundation.org Cc: SeongJae Park <sjpark@...zon.de>, Jonathan.Cameron@...wei.com, acme@...nel.org, alexander.shishkin@...ux.intel.com, amit@...nel.org, benh@...nel.crashing.org, brendanhiggins@...gle.com, corbet@....net, david@...hat.com, dwmw@...zon.com, elver@...gle.com, fan.du@...el.com, foersleo@...zon.de, greg@...ah.com, gthelen@...gle.com, guoju.fgj@...baba-inc.com, jgowans@...zon.com, joe@...ches.com, mgorman@...e.de, mheyne@...zon.de, minchan@...nel.org, mingo@...hat.com, namhyung@...nel.org, peterz@...radead.org, riel@...riel.com, rientjes@...gle.com, rostedt@...dmis.org, rppt@...nel.org, shakeelb@...gle.com, shuah@...nel.org, sieberf@...zon.com, sj38.park@...il.com, snu@...le79.org, vbabka@...e.cz, vdavydov.dev@...il.com, zgf574564920@...il.com, linux-damon@...zon.com, linux-mm@...ck.org, linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org Subject: [RFC v3 05/15] mm/damon/dbgfs: Support schemes' time/IO quotas From: SeongJae Park <sjpark@...zon.de> This commit makes the debugfs interface of DAMON to support the schemes' time/IO quotas by chaning the format of the input for the schemes file. Signed-off-by: SeongJae Park <sjpark@...zon.de> --- mm/damon/dbgfs.c | 32 +++++++++++++++++++++++++------- 1 file changed, 25 insertions(+), 7 deletions(-) diff --git a/mm/damon/dbgfs.c b/mm/damon/dbgfs.c index ac0de2de1987..3cd253a07116 100644 --- a/mm/damon/dbgfs.c +++ b/mm/damon/dbgfs.c @@ -227,11 +227,14 @@ 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 %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->quota.ms, s->quota.sz, + s->quota.reset_interval, + s->stat_count, s->stat_sz); if (!rc) return -ENOMEM; @@ -312,10 +315,11 @@ static struct damos **str_to_schemes(const char *str, ssize_t len, while (pos < len && *nr_schemes < max_nr_schemes) { struct damos_quota quota = {}; - 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 %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, "a.ms, + "a.sz, "a.reset_interval, &parsed); + if (ret != 10) break; if (!damos_action_valid(action)) { pr_err("wrong action %d\n", action); @@ -1137,6 +1141,15 @@ 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 = { .write = dbgfs_mk_context_write, }; @@ -1150,13 +1163,18 @@ 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
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