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mm: delete NR_PAGES_SCANNED and pgdat_reclaimable()

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NR_PAGES_SCANNED counts number of pages scanned since the last page free
event in the allocator.  This was used primarily to measure the
reclaimability of zones and nodes, and determine when reclaim should
give up on them.  In that role, it has been replaced in the preceding
patches by a different mechanism.

Being implemented as an efficient vmstat counter, it was automatically
exported to userspace as well.  It's however unlikely that anyone
outside the kernel is using this counter in any meaningful way.

Remove the counter and the unused pgdat_reclaimable().

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Johannes Weiner <[email protected]>
Acked-by: Hillf Danton <[email protected]>
Acked-by: Michal Hocko <[email protected]>
Cc: Jia He <[email protected]>
Cc: Mel Gorman <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Johannes Weiner 2017-05-03 14:52:10 -07:00 • committed by Linus Torvalds
commit c822f6223d
5 changed files with 3 additions and 41 deletions
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22
mm/vmstat.c
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@ -954,7 +954,6 @@ const char * const vmstat_text[] = {
"nr_unevictable",
"nr_isolated_anon",
"nr_isolated_file",
"nr_pages_scanned",
"workingset_refault",
"workingset_activate",
"workingset_nodereclaim",
@ -1378,7 +1377,6 @@ static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat,
"\n min %lu"
"\n low %lu"
"\n high %lu"
"\n node_scanned %lu"
"\n spanned %lu"
"\n present %lu"
"\n managed %lu",
@ -1386,7 +1384,6 @@ static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat,
min_wmark_pages(zone),
low_wmark_pages(zone),
high_wmark_pages(zone),
node_page_state(zone->zone_pgdat, NR_PAGES_SCANNED),
zone->spanned_pages,
zone->present_pages,
zone->managed_pages);
@ -1586,22 +1583,9 @@ int vmstat_refresh(struct ctl_table *table, int write,
for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) {
val = atomic_long_read(&vm_zone_stat[i]);
if (val < 0) {
switch (i) {
case NR_PAGES_SCANNED:
/*
* This is often seen to go negative in
* recent kernels, but not to go permanently
* negative. Whilst it would be nicer not to
* have exceptions, rooting them out would be
* another task, of rather low priority.
*/
break;
default:
pr_warn("%s: %s %ld\n",
__func__, vmstat_text[i], val);
err = -EINVAL;
break;
}
pr_warn("%s: %s %ld\n",
__func__, vmstat_text[i], val);
err = -EINVAL;
}
}
if (err)