mirror of
https://github.com/torvalds/linux
synced 2024-09-06 18:01:05 +00:00
thp, vmstat: implement HZP_ALLOC and HZP_ALLOC_FAILED events
hzp_alloc is incremented every time a huge zero page is successfully allocated. It includes allocations which where dropped due race with other allocation. Note, it doesn't count every map of the huge zero page, only its allocation. hzp_alloc_failed is incremented if kernel fails to allocate huge zero page and falls back to using small pages. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: "H. Peter Anvin" <hpa@linux.intel.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
parent
97ae17497e
commit
d8a8e1f0da
|
@ -197,6 +197,14 @@ thp_split is incremented every time a huge page is split into base
|
|||
pages. This can happen for a variety of reasons but a common
|
||||
reason is that a huge page is old and is being reclaimed.
|
||||
|
||||
thp_zero_page_alloc is incremented every time a huge zero page is
|
||||
successfully allocated. It includes allocations which where
|
||||
dropped due race with other allocation. Note, it doesn't count
|
||||
every map of the huge zero page, only its allocation.
|
||||
|
||||
thp_zero_page_alloc_failed is incremented if kernel fails to allocate
|
||||
huge zero page and falls back to using small pages.
|
||||
|
||||
As the system ages, allocating huge pages may be expensive as the
|
||||
system uses memory compaction to copy data around memory to free a
|
||||
huge page for use. There are some counters in /proc/vmstat to help
|
||||
|
|
|
@ -58,6 +58,8 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
|
|||
THP_COLLAPSE_ALLOC,
|
||||
THP_COLLAPSE_ALLOC_FAILED,
|
||||
THP_SPLIT,
|
||||
THP_ZERO_PAGE_ALLOC,
|
||||
THP_ZERO_PAGE_ALLOC_FAILED,
|
||||
#endif
|
||||
NR_VM_EVENT_ITEMS
|
||||
};
|
||||
|
|
|
@ -184,8 +184,11 @@ static unsigned long get_huge_zero_page(void)
|
|||
|
||||
zero_page = alloc_pages((GFP_TRANSHUGE | __GFP_ZERO) & ~__GFP_MOVABLE,
|
||||
HPAGE_PMD_ORDER);
|
||||
if (!zero_page)
|
||||
if (!zero_page) {
|
||||
count_vm_event(THP_ZERO_PAGE_ALLOC_FAILED);
|
||||
return 0;
|
||||
}
|
||||
count_vm_event(THP_ZERO_PAGE_ALLOC);
|
||||
preempt_disable();
|
||||
if (cmpxchg(&huge_zero_pfn, 0, page_to_pfn(zero_page))) {
|
||||
preempt_enable();
|
||||
|
|
|
@ -801,6 +801,8 @@ const char * const vmstat_text[] = {
|
|||
"thp_collapse_alloc",
|
||||
"thp_collapse_alloc_failed",
|
||||
"thp_split",
|
||||
"thp_zero_page_alloc",
|
||||
"thp_zero_page_alloc_failed",
|
||||
#endif
|
||||
|
||||
#endif /* CONFIG_VM_EVENTS_COUNTERS */
|
||||
|
|
Loading…
Reference in a new issue