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authorSeongJae Park <sj@kernel.org>2022-01-14 14:10:17 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2022-01-15 16:30:32 +0200
commit0e92c2ee9f459542c5384d9cfab24873c3dd6398 (patch)
tree8e5c66320124d6bb830d42ebce5991d20d7619f1 /mm/damon
parentf4c6d22c6cf282ef7d24a724b9bd978ee2b74fc6 (diff)
mm/damon/schemes: account scheme actions that successfully applied
Patch series "mm/damon/schemes: Extend stats for better online analysis and tuning". To help online access pattern analysis and tuning of DAMON-based Operation Schemes (DAMOS), DAMOS provides simple statistics for each scheme. Introduction of DAMOS time/space quota further made the tuning easier by making the risk management easier. However, that also made understanding of the working schemes a little bit more difficult. For an example, progress of a given scheme can now be throttled by not only the aggressiveness of the target access pattern, but also the time/space quotas. So, when a scheme is showing unexpectedly slow progress, it's difficult to know by what the progress of the scheme is throttled, with currently provided statistics. This patchset extends the statistics to contain some metrics that can be helpful for such online schemes analysis and tuning (patches 1-2), exports those to users (patches 3 and 5), and add documents (patches 4 and 6). This patch (of 6): DAMON-based operation schemes (DAMOS) stats provide only the number and the amount of regions that the action of the scheme has tried to be applied. Because the action could be failed for some reasons, the currently provided information is sometimes not useful or convenient enough for schemes profiling and tuning. To improve this situation, this commit extends the DAMOS stats to provide the number and the amount of regions that the action has successfully applied. Link: https://lkml.kernel.org/r/20211210150016.35349-1-sj@kernel.org Link: https://lkml.kernel.org/r/20211210150016.35349-2-sj@kernel.org Signed-off-by: SeongJae Park <sj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/damon')
-rw-r--r--mm/damon/core.c13
-rw-r--r--mm/damon/dbgfs.c2
-rw-r--r--mm/damon/paddr.c13
-rw-r--r--mm/damon/vaddr.c30
4 files changed, 32 insertions, 26 deletions
diff --git a/mm/damon/core.c b/mm/damon/core.c
index 4515cf82c433..d745bf28509f 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -102,8 +102,7 @@ struct damos *damon_new_scheme(
scheme->min_age_region = min_age_region;
scheme->max_age_region = max_age_region;
scheme->action = action;
- scheme->stat_count = 0;
- scheme->stat_sz = 0;
+ scheme->stat = (struct damos_stat){};
INIT_LIST_HEAD(&scheme->list);
scheme->quota.ms = quota->ms;
@@ -574,6 +573,7 @@ static void damon_do_apply_schemes(struct damon_ctx *c,
struct damos_quota *quota = &s->quota;
unsigned long sz = r->ar.end - r->ar.start;
struct timespec64 begin, end;
+ unsigned long sz_applied = 0;
if (!s->wmarks.activated)
continue;
@@ -627,7 +627,7 @@ static void damon_do_apply_schemes(struct damon_ctx *c,
damon_split_region_at(c, t, r, sz);
}
ktime_get_coarse_ts64(&begin);
- c->primitive.apply_scheme(c, t, r, s);
+ sz_applied = c->primitive.apply_scheme(c, t, r, s);
ktime_get_coarse_ts64(&end);
quota->total_charged_ns += timespec64_to_ns(&end) -
timespec64_to_ns(&begin);
@@ -641,8 +641,11 @@ static void damon_do_apply_schemes(struct damon_ctx *c,
r->age = 0;
update_stat:
- s->stat_count++;
- s->stat_sz += sz;
+ s->stat.nr_tried++;
+ s->stat.sz_tried += sz;
+ if (sz_applied)
+ s->stat.nr_applied++;
+ s->stat.sz_applied += sz_applied;
}
}
diff --git a/mm/damon/dbgfs.c b/mm/damon/dbgfs.c
index bf36a2756cfb..9318b52d0b46 100644
--- a/mm/damon/dbgfs.c
+++ b/mm/damon/dbgfs.c
@@ -117,7 +117,7 @@ static ssize_t sprint_schemes(struct damon_ctx *c, char *buf, ssize_t len)
s->quota.weight_age,
s->wmarks.metric, s->wmarks.interval,
s->wmarks.high, s->wmarks.mid, s->wmarks.low,
- s->stat_count, s->stat_sz);
+ s->stat.nr_tried, s->stat.sz_tried);
if (!rc)
return -ENOMEM;
diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c
index 4318134cbc4c..5e8244f65a1a 100644
--- a/mm/damon/paddr.c
+++ b/mm/damon/paddr.c
@@ -213,14 +213,15 @@ bool damon_pa_target_valid(void *t)
return true;
}
-static int damon_pa_apply_scheme(struct damon_ctx *ctx, struct damon_target *t,
- struct damon_region *r, struct damos *scheme)
+static unsigned long damon_pa_apply_scheme(struct damon_ctx *ctx,
+ struct damon_target *t, struct damon_region *r,
+ struct damos *scheme)
{
- unsigned long addr;
+ unsigned long addr, applied;
LIST_HEAD(page_list);
if (scheme->action != DAMOS_PAGEOUT)
- return -EINVAL;
+ return 0;
for (addr = r->ar.start; addr < r->ar.end; addr += PAGE_SIZE) {
struct page *page = damon_get_page(PHYS_PFN(addr));
@@ -241,9 +242,9 @@ static int damon_pa_apply_scheme(struct damon_ctx *ctx, struct damon_target *t,
put_page(page);
}
}
- reclaim_pages(&page_list);
+ applied = reclaim_pages(&page_list);
cond_resched();
- return 0;
+ return applied * PAGE_SIZE;
}
static int damon_pa_scheme_score(struct damon_ctx *context,
diff --git a/mm/damon/vaddr.c b/mm/damon/vaddr.c
index 68d9e4134816..a10df3fd3d02 100644
--- a/mm/damon/vaddr.c
+++ b/mm/damon/vaddr.c
@@ -572,32 +572,34 @@ bool damon_va_target_valid(void *target)
}
#ifndef CONFIG_ADVISE_SYSCALLS
-static int damos_madvise(struct damon_target *target, struct damon_region *r,
- int behavior)
+static unsigned long damos_madvise(struct damon_target *target,
+ struct damon_region *r, int behavior)
{
- return -EINVAL;
+ return 0;
}
#else
-static int damos_madvise(struct damon_target *target, struct damon_region *r,
- int behavior)
+static unsigned long damos_madvise(struct damon_target *target,
+ struct damon_region *r, int behavior)
{
struct mm_struct *mm;
- int ret = -ENOMEM;
+ unsigned long start = PAGE_ALIGN(r->ar.start);
+ unsigned long len = PAGE_ALIGN(r->ar.end - r->ar.start);
+ unsigned long applied;
mm = damon_get_mm(target);
if (!mm)
- goto out;
+ return 0;
- ret = do_madvise(mm, PAGE_ALIGN(r->ar.start),
- PAGE_ALIGN(r->ar.end - r->ar.start), behavior);
+ applied = do_madvise(mm, start, len, behavior) ? 0 : len;
mmput(mm);
-out:
- return ret;
+
+ return applied;
}
#endif /* CONFIG_ADVISE_SYSCALLS */
-static int damon_va_apply_scheme(struct damon_ctx *ctx, struct damon_target *t,
- struct damon_region *r, struct damos *scheme)
+static unsigned long damon_va_apply_scheme(struct damon_ctx *ctx,
+ struct damon_target *t, struct damon_region *r,
+ struct damos *scheme)
{
int madv_action;
@@ -620,7 +622,7 @@ static int damon_va_apply_scheme(struct damon_ctx *ctx, struct damon_target *t,
case DAMOS_STAT:
return 0;
default:
- return -EINVAL;
+ return 0;
}
return damos_madvise(t, r, madv_action);