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mm/damon/lru_sort: fix quota status loss due to online tunings 

commit 13d0599ab3b2ff17f798353f24bcbef1659d3cfc upstream.

For online parameters change, DAMON_LRU_SORT creates new schemes based on
latest values of the parameters and replaces the old schemes with the new
one.  When creating it, the internal status of the quotas of the old
schemes is not preserved.  As a result, charging of the quota starts from
zero after the online tuning.  The data that collected to estimate the
throughput of the scheme's action is also reset, and therefore the
estimation should start from the scratch again.  Because the throughput
estimation is being used to convert the time quota to the effective size
quota, this could result in temporal time quota inaccuracy.  It would be
recovered over time, though.  In short, the quota accuracy could be
temporarily degraded after online parameters update.

Fix the problem by checking the case and copying the internal fields for
the status.

Link: https://lkml.kernel.org/r/20240216194025.9207-3-sj@kernel.org
Fixes: 40e983cca9 ("mm/damon: introduce DAMON-based LRU-lists Sorting")
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: <stable@vger.kernel.org>	[6.0+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
SeongJae Park 2024-02-16 11:40:25 -08:00 committed by Greg Kroah-Hartman
parent 2dedda77d4
commit 4c815c3a48
1 changed files with 36 additions and 7 deletions
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43
mm/damon/lru_sort.c
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@ -185,9 +185,21 @@ static struct damos *damon_lru_sort_new_cold_scheme(unsigned int cold_thres)
return damon_lru_sort_new_scheme(&pattern, DAMOS_LRU_DEPRIO); return damon_lru_sort_new_scheme(&pattern, DAMOS_LRU_DEPRIO);
} }
static void damon_lru_sort_copy_quota_status(struct damos_quota *dst,
struct damos_quota *src)
{
dst->total_charged_sz = src->total_charged_sz;
dst->total_charged_ns = src->total_charged_ns;
dst->charged_sz = src->charged_sz;
dst->charged_from = src->charged_from;
dst->charge_target_from = src->charge_target_from;
dst->charge_addr_from = src->charge_addr_from;
}
static int damon_lru_sort_apply_parameters(void) static int damon_lru_sort_apply_parameters(void)
{ {
struct damos *scheme; struct damos *scheme, *hot_scheme, *cold_scheme;
struct damos *old_hot_scheme = NULL, *old_cold_scheme = NULL;
unsigned int hot_thres, cold_thres; unsigned int hot_thres, cold_thres;
int err = 0; int err = 0;
@ -195,18 +207,35 @@ static int damon_lru_sort_apply_parameters(void)
if (err) if (err)
return err; return err;
damon_for_each_scheme(scheme, ctx) {
if (!old_hot_scheme) {
old_hot_scheme = scheme;
continue;
}
old_cold_scheme = scheme;
}
hot_thres = damon_max_nr_accesses(&damon_lru_sort_mon_attrs) * hot_thres = damon_max_nr_accesses(&damon_lru_sort_mon_attrs) *
hot_thres_access_freq / 1000; hot_thres_access_freq / 1000;
scheme = damon_lru_sort_new_hot_scheme(hot_thres); hot_scheme = damon_lru_sort_new_hot_scheme(hot_thres);
if (!scheme) if (!hot_scheme)
return -ENOMEM; return -ENOMEM;
damon_set_schemes(ctx, &scheme, 1); if (old_hot_scheme)
damon_lru_sort_copy_quota_status(&hot_scheme->quota,
&old_hot_scheme->quota);
cold_thres = cold_min_age / damon_lru_sort_mon_attrs.aggr_interval; cold_thres = cold_min_age / damon_lru_sort_mon_attrs.aggr_interval;
scheme = damon_lru_sort_new_cold_scheme(cold_thres); cold_scheme = damon_lru_sort_new_cold_scheme(cold_thres);
if (!scheme) if (!cold_scheme) {
damon_destroy_scheme(hot_scheme);
return -ENOMEM; return -ENOMEM;
damon_add_scheme(ctx, scheme); }
if (old_cold_scheme)
damon_lru_sort_copy_quota_status(&cold_scheme->quota,
&old_cold_scheme->quota);
damon_set_schemes(ctx, &hot_scheme, 1);
damon_add_scheme(ctx, cold_scheme);
return damon_set_region_biggest_system_ram_default(target, return damon_set_region_biggest_system_ram_default(target,
&monitor_region_start, &monitor_region_start,