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mm: use unsigned types for fragmentation score

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Proactive compaction uses per-node/zone "fragmentation score" which is
always in range [0, 100], so use unsigned type of these scores as well as
for related constants.

Signed-off-by: Nitin Gupta <nigupta@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Baoquan He <bhe@redhat.com>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Link: http://lkml.kernel.org/r/20200618010319.13159-1-nigupta@nvidia.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Nitin Gupta 2020-08-11 18:31:07 -07:00 committed by Linus Torvalds
parent 25788738eb
commit d34c0a7599
4 changed files with 13 additions and 13 deletions
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4
include/linux/compaction.h
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@ -85,13 +85,13 @@ static inline unsigned long compact_gap(unsigned int order)
#ifdef CONFIG_COMPACTION
extern int sysctl_compact_memory;
extern int sysctl_compaction_proactiveness;
extern unsigned int sysctl_compaction_proactiveness;
extern int sysctl_compaction_handler(struct ctl_table *table, int write,
void *buffer, size_t *length, loff_t *ppos);
extern int sysctl_extfrag_threshold;
extern int sysctl_compact_unevictable_allowed;
extern int extfrag_for_order(struct zone *zone, unsigned int order);
extern unsigned int extfrag_for_order(struct zone *zone, unsigned int order);
extern int fragmentation_index(struct zone *zone, unsigned int order);
extern enum compact_result try_to_compact_pages(gfp_t gfp_mask,
unsigned int order, unsigned int alloc_flags,

2
kernel/sysctl.c
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@ -2854,7 +2854,7 @@ static struct ctl_table vm_table[] = {
{
.procname = "compaction_proactiveness",
.data = &sysctl_compaction_proactiveness,
.maxlen = sizeof(int),
.maxlen = sizeof(sysctl_compaction_proactiveness),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ZERO,

18
mm/compaction.c
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@ -53,7 +53,7 @@ static inline void count_compact_events(enum vm_event_item item, long delta)
/*
* Fragmentation score check interval for proactive compaction purposes.
*/
static const int HPAGE_FRAG_CHECK_INTERVAL_MSEC = 500;
static const unsigned int HPAGE_FRAG_CHECK_INTERVAL_MSEC = 500;
/*
* Page order with-respect-to which proactive compaction
@ -1890,7 +1890,7 @@ static bool kswapd_is_running(pg_data_t *pgdat)
* ZONE_DMA32. For smaller zones, the score value remains close to zero,
* and thus never exceeds the high threshold for proactive compaction.
*/
static int fragmentation_score_zone(struct zone *zone)
static unsigned int fragmentation_score_zone(struct zone *zone)
{
unsigned long score;
@ -1906,9 +1906,9 @@ static int fragmentation_score_zone(struct zone *zone)
* the node's score falls below the low threshold, or one of the back-off
* conditions is met.
*/
static int fragmentation_score_node(pg_data_t *pgdat)
static unsigned int fragmentation_score_node(pg_data_t *pgdat)
{
unsigned long score = 0;
unsigned int score = 0;
int zoneid;
for (zoneid = 0; zoneid < MAX_NR_ZONES; zoneid++) {
@ -1921,17 +1921,17 @@ static int fragmentation_score_node(pg_data_t *pgdat)
return score;
}
static int fragmentation_score_wmark(pg_data_t *pgdat, bool low)
static unsigned int fragmentation_score_wmark(pg_data_t *pgdat, bool low)
{
int wmark_low;
unsigned int wmark_low;
/*
* Cap the low watermak to avoid excessive compaction
* activity in case a user sets the proactivess tunable
* close to 100 (maximum).
*/
wmark_low = max(100 - sysctl_compaction_proactiveness, 5);
return low ? wmark_low : min(wmark_low + 10, 100);
wmark_low = max(100U - sysctl_compaction_proactiveness, 5U);
return low ? wmark_low : min(wmark_low + 10, 100U);
}
static bool should_proactive_compact_node(pg_data_t *pgdat)
@ -2615,7 +2615,7 @@ int sysctl_compact_memory;
* aggressively the kernel should compact memory in the
* background. It takes values in the range [0, 100].
*/
int __read_mostly sysctl_compaction_proactiveness = 20;
unsigned int __read_mostly sysctl_compaction_proactiveness = 20;
/*
* This is the entry point for compacting all nodes via

2
mm/vmstat.c
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@ -1101,7 +1101,7 @@ static int __fragmentation_index(unsigned int order, struct contig_page_info *in
* It is defined as the percentage of pages found in blocks of size
* less than 1 << order. It returns values in range [0, 100].
*/
int extfrag_for_order(struct zone *zone, unsigned int order)
unsigned int extfrag_for_order(struct zone *zone, unsigned int order)
{
struct contig_page_info info;