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mm/khugepaged: propagate enum scan_result codes back to callers 

Propagate enum scan_result codes back through return values of
functions downstream of khugepaged_scan_file() and
khugepaged_scan_pmd() to inform callers if the operation was
successful, and if not, why.

Since khugepaged_scan_pmd()'s return value already has a specific meaning
(whether mmap_lock was unlocked or not), add a bool* argument to
khugepaged_scan_pmd() to retrieve this information.

Change khugepaged to take action based on the return values of
khugepaged_scan_file() and khugepaged_scan_pmd() instead of acting deep
within the collapsing functions themselves.

hugepage_vma_revalidate() now returns SCAN_SUCCEED on success to be more
consistent with enum scan_result propagation.

Remove dependency on error pointers to communicate to khugepaged that
allocation failed and it should sleep; instead just use the result of the
scan (SCAN_ALLOC_HUGE_PAGE_FAIL if allocation fails).

Link: https://lkml.kernel.org/r/20220706235936.2197195-6-zokeefe@google.com
Signed-off-by: Zach O'Keefe <zokeefe@google.com>
Reviewed-by: Yang Shi <shy828301@gmail.com>
Cc: Alex Shi <alex.shi@linux.alibaba.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: Chris Kennelly <ckennelly@google.com>
Cc: Chris Zankel <chris@zankel.net>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Hugh Dickins <hughd@google.com>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: Pavel Begunkov <asml.silence@gmail.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Rongwei Wang <rongwei.wang@linux.alibaba.com>
Cc: SeongJae Park <sj@kernel.org>
Cc: Song Liu <songliubraving@fb.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Zi Yan <ziy@nvidia.com>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Cc: "Souptick Joarder (HPE)" <jrdr.linux@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Zach O'Keefe 2022-07-06 16:59:23 -07:00 committed by Andrew Morton
parent 9710a78ab2
commit 50ad2f24b3
1 changed files with 117 additions and 116 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

233
mm/khugepaged.c
View File

@ -558,7 +558,7 @@ static int __collapse_huge_page_isolate(struct vm_area_struct *vma,
{
struct page *page = NULL;
pte_t *_pte;
int none_or_zero = 0, shared = 0, result = 0, referenced = 0;
int none_or_zero = 0, shared = 0, result = SCAN_FAIL, referenced = 0;
bool writable = false;
for (_pte = pte; _pte < pte + HPAGE_PMD_NR;
@ -672,13 +672,13 @@ next:
result = SCAN_SUCCEED;
trace_mm_collapse_huge_page_isolate(page, none_or_zero,
referenced, writable, result);
return 1;
return result;
}
out:
release_pte_pages(pte, _pte, compound_pagelist);
trace_mm_collapse_huge_page_isolate(page, none_or_zero,
referenced, writable, result);
return 0;
return result;
}
static void __collapse_huge_page_copy(pte_t *pte, struct page *page,
@ -818,7 +818,6 @@ static bool khugepaged_alloc_page(struct page **hpage, gfp_t gfp, int node)
*hpage = __alloc_pages_node(node, gfp, HPAGE_PMD_ORDER);
if (unlikely(!*hpage)) {
count_vm_event(THP_COLLAPSE_ALLOC_FAILED);
*hpage = ERR_PTR(-ENOMEM);
return false;
}
@ -830,8 +829,7 @@ static bool khugepaged_alloc_page(struct page **hpage, gfp_t gfp, int node)
/*
* If mmap_lock temporarily dropped, revalidate vma
* before taking mmap_lock.
* Return 0 if succeeds, otherwise return none-zero
* value (scan code).
* Returns enum scan_result value.
*/
static int hugepage_vma_revalidate(struct mm_struct *mm, unsigned long address,
@ -859,7 +857,7 @@ static int hugepage_vma_revalidate(struct mm_struct *mm, unsigned long address,
*/
if (!vma->anon_vma || !vma_is_anonymous(vma))
return SCAN_VMA_CHECK;
return 0;
return SCAN_SUCCEED;
}
/*
@ -870,10 +868,10 @@ static int hugepage_vma_revalidate(struct mm_struct *mm, unsigned long address,
* Note that if false is returned, mmap_lock will be released.
*/
static bool __collapse_huge_page_swapin(struct mm_struct *mm,
struct vm_area_struct *vma,
unsigned long haddr, pmd_t *pmd,
int referenced)
static int __collapse_huge_page_swapin(struct mm_struct *mm,
struct vm_area_struct *vma,
unsigned long haddr, pmd_t *pmd,
int referenced)
{
int swapped_in = 0;
vm_fault_t ret = 0;
@ -904,12 +902,13 @@ static bool __collapse_huge_page_swapin(struct mm_struct *mm,
*/
if (ret & VM_FAULT_RETRY) {
trace_mm_collapse_huge_page_swapin(mm, swapped_in, referenced, 0);
return false;
/* Likely, but not guaranteed, that page lock failed */
return SCAN_PAGE_LOCK;
}
if (ret & VM_FAULT_ERROR) {
mmap_read_unlock(mm);
trace_mm_collapse_huge_page_swapin(mm, swapped_in, referenced, 0);
return false;
return SCAN_FAIL;
}
swapped_in++;
}
@ -919,7 +918,7 @@ static bool __collapse_huge_page_swapin(struct mm_struct *mm,
lru_add_drain();
trace_mm_collapse_huge_page_swapin(mm, swapped_in, referenced, 1);
return true;
return SCAN_SUCCEED;
}
static int alloc_charge_hpage(struct page **hpage, struct mm_struct *mm,
@ -937,17 +936,17 @@ static int alloc_charge_hpage(struct page **hpage, struct mm_struct *mm,
return SCAN_SUCCEED;
}
static void collapse_huge_page(struct mm_struct *mm, unsigned long address,
struct page **hpage, int referenced,
int unmapped, struct collapse_control *cc)
static int collapse_huge_page(struct mm_struct *mm, unsigned long address,
int referenced, int unmapped,
struct collapse_control *cc)
{
LIST_HEAD(compound_pagelist);
pmd_t *pmd, _pmd;
pte_t *pte;
pgtable_t pgtable;
struct page *new_page;
struct page *hpage;
spinlock_t *pmd_ptl, *pte_ptl;
int isolated = 0, result = 0;
int result = SCAN_FAIL;
struct vm_area_struct *vma;
struct mmu_notifier_range range;
@ -961,15 +960,13 @@ static void collapse_huge_page(struct mm_struct *mm, unsigned long address,
*/
mmap_read_unlock(mm);
result = alloc_charge_hpage(hpage, mm, cc);
result = alloc_charge_hpage(&hpage, mm, cc);
if (result != SCAN_SUCCEED)
goto out_nolock;
new_page = *hpage;
mmap_read_lock(mm);
result = hugepage_vma_revalidate(mm, address, &vma);
if (result) {
if (result != SCAN_SUCCEED) {
mmap_read_unlock(mm);
goto out_nolock;
}
@ -981,14 +978,16 @@ static void collapse_huge_page(struct mm_struct *mm, unsigned long address,
goto out_nolock;
}
/*
* __collapse_huge_page_swapin will return with mmap_lock released
* when it fails. So we jump out_nolock directly in that case.
* Continuing to collapse causes inconsistency.
*/
if (unmapped && !__collapse_huge_page_swapin(mm, vma, address,
pmd, referenced)) {
goto out_nolock;
if (unmapped) {
/*
* __collapse_huge_page_swapin will return with mmap_lock
* released when it fails. So we jump out_nolock directly in
* that case. Continuing to collapse causes inconsistency.
*/
result = __collapse_huge_page_swapin(mm, vma, address, pmd,
referenced);
if (result != SCAN_SUCCEED)
goto out_nolock;
}
mmap_read_unlock(mm);
@ -999,7 +998,7 @@ static void collapse_huge_page(struct mm_struct *mm, unsigned long address,
*/
mmap_write_lock(mm);
result = hugepage_vma_revalidate(mm, address, &vma);
if (result)
if (result != SCAN_SUCCEED)
goto out_up_write;
/* check if the pmd is still valid */
if (mm_find_pmd(mm, address) != pmd)
@ -1026,11 +1025,11 @@ static void collapse_huge_page(struct mm_struct *mm, unsigned long address,
mmu_notifier_invalidate_range_end(&range);
spin_lock(pte_ptl);
isolated = __collapse_huge_page_isolate(vma, address, pte,
&compound_pagelist);
result = __collapse_huge_page_isolate(vma, address, pte,
&compound_pagelist);
spin_unlock(pte_ptl);
if (unlikely(!isolated)) {
if (unlikely(result != SCAN_SUCCEED)) {
pte_unmap(pte);
spin_lock(pmd_ptl);
BUG_ON(!pmd_none(*pmd));
@ -1042,7 +1041,6 @@ static void collapse_huge_page(struct mm_struct *mm, unsigned long address,
pmd_populate(mm, pmd, pmd_pgtable(_pmd));
spin_unlock(pmd_ptl);
anon_vma_unlock_write(vma->anon_vma);
result = SCAN_FAIL;
goto out_up_write;
}
@ -1052,8 +1050,8 @@ static void collapse_huge_page(struct mm_struct *mm, unsigned long address,
*/
anon_vma_unlock_write(vma->anon_vma);
__collapse_huge_page_copy(pte, new_page, vma, address, pte_ptl,
&compound_pagelist);
__collapse_huge_page_copy(pte, hpage, vma, address, pte_ptl,
&compound_pagelist);
pte_unmap(pte);
/*
* spin_lock() below is not the equivalent of smp_wmb(), but
@ -1061,43 +1059,42 @@ static void collapse_huge_page(struct mm_struct *mm, unsigned long address,
* avoid the copy_huge_page writes to become visible after
* the set_pmd_at() write.
*/
__SetPageUptodate(new_page);
__SetPageUptodate(hpage);
pgtable = pmd_pgtable(_pmd);
_pmd = mk_huge_pmd(new_page, vma->vm_page_prot);
_pmd = mk_huge_pmd(hpage, vma->vm_page_prot);
_pmd = maybe_pmd_mkwrite(pmd_mkdirty(_pmd), vma);
spin_lock(pmd_ptl);
BUG_ON(!pmd_none(*pmd));
page_add_new_anon_rmap(new_page, vma, address);
lru_cache_add_inactive_or_unevictable(new_page, vma);
page_add_new_anon_rmap(hpage, vma, address);
lru_cache_add_inactive_or_unevictable(hpage, vma);
pgtable_trans_huge_deposit(mm, pmd, pgtable);
set_pmd_at(mm, address, pmd, _pmd);
update_mmu_cache_pmd(vma, address, pmd);
spin_unlock(pmd_ptl);
*hpage = NULL;
hpage = NULL;
khugepaged_pages_collapsed++;
result = SCAN_SUCCEED;
out_up_write:
mmap_write_unlock(mm);
out_nolock:
if (!IS_ERR_OR_NULL(*hpage)) {
mem_cgroup_uncharge(page_folio(*hpage));
put_page(*hpage);
if (hpage) {
mem_cgroup_uncharge(page_folio(hpage));
put_page(hpage);
}
trace_mm_collapse_huge_page(mm, isolated, result);
return;
trace_mm_collapse_huge_page(mm, result == SCAN_SUCCEED, result);
return result;
}
static int khugepaged_scan_pmd(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long address, struct page **hpage,
unsigned long address, bool *mmap_locked,
struct collapse_control *cc)
{
pmd_t *pmd;
pte_t *pte, *_pte;
int ret = 0, result = 0, referenced = 0;
int result = SCAN_FAIL, referenced = 0;
int none_or_zero = 0, shared = 0;
struct page *page = NULL;
unsigned long _address;
@ -1234,19 +1231,19 @@ static int khugepaged_scan_pmd(struct mm_struct *mm, struct vm_area_struct *vma,
result = SCAN_LACK_REFERENCED_PAGE;
} else {
result = SCAN_SUCCEED;
ret = 1;
}
out_unmap:
pte_unmap_unlock(pte, ptl);
if (ret) {
if (result == SCAN_SUCCEED) {
result = collapse_huge_page(mm, address, referenced,
unmapped, cc);
/* collapse_huge_page will return with the mmap_lock released */
collapse_huge_page(mm, address, hpage, referenced, unmapped,
cc);
*mmap_locked = false;
}
out:
trace_mm_khugepaged_scan_pmd(mm, page, writable, referenced,
none_or_zero, result, unmapped);
return ret;
return result;
}
static void collect_mm_slot(struct mm_slot *mm_slot)
@ -1508,7 +1505,6 @@ static void retract_page_tables(struct address_space *mapping, pgoff_t pgoff)
* @mm: process address space where collapse happens
* @file: file that collapse on
* @start: collapse start address
* @hpage: new allocated huge page for collapse
* @cc: collapse context and scratchpad
*
* Basic scheme is simple, details are more complex:
@ -1526,12 +1522,11 @@ static void retract_page_tables(struct address_space *mapping, pgoff_t pgoff)
* + restore gaps in the page cache;
* + unlock and free huge page;
*/
static void collapse_file(struct mm_struct *mm, struct file *file,
pgoff_t start, struct page **hpage,
struct collapse_control *cc)
static int collapse_file(struct mm_struct *mm, struct file *file,
pgoff_t start, struct collapse_control *cc)
{
struct address_space *mapping = file->f_mapping;
struct page *new_page;
struct page *hpage;
pgoff_t index, end = start + HPAGE_PMD_NR;
LIST_HEAD(pagelist);
XA_STATE_ORDER(xas, &mapping->i_pages, start, HPAGE_PMD_ORDER);
@ -1542,12 +1537,10 @@ static void collapse_file(struct mm_struct *mm, struct file *file,
VM_BUG_ON(!IS_ENABLED(CONFIG_READ_ONLY_THP_FOR_FS) && !is_shmem);
VM_BUG_ON(start & (HPAGE_PMD_NR - 1));
result = alloc_charge_hpage(hpage, mm, cc);
result = alloc_charge_hpage(&hpage, mm, cc);
if (result != SCAN_SUCCEED)
goto out;
new_page = *hpage;
/*
* Ensure we have slots for all the pages in the range. This is
* almost certainly a no-op because most of the pages must be present
@ -1564,14 +1557,14 @@ static void collapse_file(struct mm_struct *mm, struct file *file,
}
} while (1);
__SetPageLocked(new_page);
__SetPageLocked(hpage);
if (is_shmem)
__SetPageSwapBacked(new_page);
new_page->index = start;
new_page->mapping = mapping;
__SetPageSwapBacked(hpage);
hpage->index = start;
hpage->mapping = mapping;
/*
* At this point the new_page is locked and not up-to-date.
* At this point the hpage is locked and not up-to-date.
* It's safe to insert it into the page cache, because nobody would
* be able to map it or use it in another way until we unlock it.
*/
@ -1599,7 +1592,7 @@ static void collapse_file(struct mm_struct *mm, struct file *file,
result = SCAN_FAIL;
goto xa_locked;
}
xas_store(&xas, new_page);
xas_store(&xas, hpage);
nr_none++;
continue;
}
@ -1741,19 +1734,19 @@ static void collapse_file(struct mm_struct *mm, struct file *file,
list_add_tail(&page->lru, &pagelist);
/* Finally, replace with the new page. */
xas_store(&xas, new_page);
xas_store(&xas, hpage);
continue;
out_unlock:
unlock_page(page);
put_page(page);
goto xa_unlocked;
}
nr = thp_nr_pages(new_page);
nr = thp_nr_pages(hpage);
if (is_shmem)
__mod_lruvec_page_state(new_page, NR_SHMEM_THPS, nr);
__mod_lruvec_page_state(hpage, NR_SHMEM_THPS, nr);
else {
__mod_lruvec_page_state(new_page, NR_FILE_THPS, nr);
__mod_lruvec_page_state(hpage, NR_FILE_THPS, nr);
filemap_nr_thps_inc(mapping);
/*
* Paired with smp_mb() in do_dentry_open() to ensure
@ -1764,21 +1757,21 @@ out_unlock:
smp_mb();
if (inode_is_open_for_write(mapping->host)) {
result = SCAN_FAIL;
__mod_lruvec_page_state(new_page, NR_FILE_THPS, -nr);
__mod_lruvec_page_state(hpage, NR_FILE_THPS, -nr);
filemap_nr_thps_dec(mapping);
goto xa_locked;
}
}
if (nr_none) {
__mod_lruvec_page_state(new_page, NR_FILE_PAGES, nr_none);
__mod_lruvec_page_state(hpage, NR_FILE_PAGES, nr_none);
/* nr_none is always 0 for non-shmem. */
__mod_lruvec_page_state(new_page, NR_SHMEM, nr_none);
__mod_lruvec_page_state(hpage, NR_SHMEM, nr_none);
}
/* Join all the small entries into a single multi-index entry */
xas_set_order(&xas, start, HPAGE_PMD_ORDER);
xas_store(&xas, new_page);
xas_store(&xas, hpage);
xa_locked:
xas_unlock_irq(&xas);
xa_unlocked:
@ -1800,11 +1793,11 @@ xa_unlocked:
index = start;
list_for_each_entry_safe(page, tmp, &pagelist, lru) {
while (index < page->index) {
clear_highpage(new_page + (index % HPAGE_PMD_NR));
clear_highpage(hpage + (index % HPAGE_PMD_NR));
index++;
}
copy_highpage(new_page + (page->index % HPAGE_PMD_NR),
page);
copy_highpage(hpage + (page->index % HPAGE_PMD_NR),
page);
list_del(&page->lru);
page->mapping = NULL;
page_ref_unfreeze(page, 1);
@ -1815,23 +1808,22 @@ xa_unlocked:
index++;
}
while (index < end) {
clear_highpage(new_page + (index % HPAGE_PMD_NR));
clear_highpage(hpage + (index % HPAGE_PMD_NR));
index++;
}
SetPageUptodate(new_page);
page_ref_add(new_page, HPAGE_PMD_NR - 1);
SetPageUptodate(hpage);
page_ref_add(hpage, HPAGE_PMD_NR - 1);
if (is_shmem)
set_page_dirty(new_page);
lru_cache_add(new_page);
set_page_dirty(hpage);
lru_cache_add(hpage);
/*
* Remove pte page tables, so we can re-fault the page as huge.
*/
retract_page_tables(mapping, start);
*hpage = NULL;
khugepaged_pages_collapsed++;
unlock_page(hpage);
hpage = NULL;
} else {
struct page *page;
@ -1870,22 +1862,23 @@ xa_unlocked:
VM_BUG_ON(nr_none);
xas_unlock_irq(&xas);
new_page->mapping = NULL;
hpage->mapping = NULL;
}
unlock_page(new_page);
if (hpage)
unlock_page(hpage);
out:
VM_BUG_ON(!list_empty(&pagelist));
if (!IS_ERR_OR_NULL(*hpage)) {
mem_cgroup_uncharge(page_folio(*hpage));
put_page(*hpage);
if (hpage) {
mem_cgroup_uncharge(page_folio(hpage));
put_page(hpage);
}
/* TODO: tracepoints */
return result;
}
static void khugepaged_scan_file(struct mm_struct *mm, struct file *file,
pgoff_t start, struct page **hpage,
struct collapse_control *cc)
static int khugepaged_scan_file(struct mm_struct *mm, struct file *file,
pgoff_t start, struct collapse_control *cc)
{
struct page *page = NULL;
struct address_space *mapping = file->f_mapping;
@ -1958,16 +1951,16 @@ static void khugepaged_scan_file(struct mm_struct *mm, struct file *file,
result = SCAN_EXCEED_NONE_PTE;
count_vm_event(THP_SCAN_EXCEED_NONE_PTE);
} else {
collapse_file(mm, file, start, hpage, cc);
result = collapse_file(mm, file, start, cc);
}
}
/* TODO: tracepoints */
return result;
}
#else
static void khugepaged_scan_file(struct mm_struct *mm, struct file *file,
pgoff_t start, struct page **hpage,
struct collapse_control *cc)
static int khugepaged_scan_file(struct mm_struct *mm, struct file *file,
pgoff_t start, struct collapse_control *cc)
{
BUILD_BUG();
}
@ -1977,8 +1970,7 @@ static void khugepaged_collapse_pte_mapped_thps(struct mm_slot *mm_slot)
}
#endif
static unsigned int khugepaged_scan_mm_slot(unsigned int pages,
struct page **hpage,
static unsigned int khugepaged_scan_mm_slot(unsigned int pages, int *result,
struct collapse_control *cc)
__releases(&khugepaged_mm_lock)
__acquires(&khugepaged_mm_lock)
@ -1990,6 +1982,7 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages,
VM_BUG_ON(!pages);
lockdep_assert_held(&khugepaged_mm_lock);
*result = SCAN_FAIL;
if (khugepaged_scan.mm_slot)
mm_slot = khugepaged_scan.mm_slot;
@ -2036,7 +2029,8 @@ skip:
VM_BUG_ON(khugepaged_scan.address & ~HPAGE_PMD_MASK);
while (khugepaged_scan.address < hend) {
int ret;
bool mmap_locked = true;
cond_resched();
if (unlikely(khugepaged_test_exit(mm)))
goto breakouterloop;
@ -2050,20 +2044,28 @@ skip:
khugepaged_scan.address);
mmap_read_unlock(mm);
ret = 1;
khugepaged_scan_file(mm, file, pgoff, hpage,
cc);
*result = khugepaged_scan_file(mm, file, pgoff,
cc);
mmap_locked = false;
fput(file);
} else {
ret = khugepaged_scan_pmd(mm, vma,
khugepaged_scan.address,
hpage, cc);
*result = khugepaged_scan_pmd(mm, vma,
khugepaged_scan.address,
&mmap_locked, cc);
}
if (*result == SCAN_SUCCEED)
++khugepaged_pages_collapsed;
/* move to next address */
khugepaged_scan.address += HPAGE_PMD_SIZE;
progress += HPAGE_PMD_NR;
if (ret)
/* we released mmap_lock so break loop */
if (!mmap_locked)
/*
* We released mmap_lock so break loop. Note
* that we drop mmap_lock before all hugepage
* allocations, so if allocation fails, we are
* guaranteed to break here and report the
* correct result back to caller.
*/
goto breakouterloop_mmap_lock;
if (progress >= pages)
goto breakouterloop;
@ -2115,10 +2117,10 @@ static int khugepaged_wait_event(void)
static void khugepaged_do_scan(struct collapse_control *cc)
{
struct page *hpage = NULL;
unsigned int progress = 0, pass_through_head = 0;
unsigned int pages = READ_ONCE(khugepaged_pages_to_scan);
bool wait = true;
int result = SCAN_SUCCEED;
lru_add_drain_all();
@ -2134,7 +2136,7 @@ static void khugepaged_do_scan(struct collapse_control *cc)
if (khugepaged_has_work() &&
pass_through_head < 2)
progress += khugepaged_scan_mm_slot(pages - progress,
&hpage, cc);
&result, cc);
else
progress = pages;
spin_unlock(&khugepaged_mm_lock);
@ -2142,7 +2144,7 @@ static void khugepaged_do_scan(struct collapse_control *cc)
if (progress >= pages)
break;
if (IS_ERR(hpage)) {
if (result == SCAN_ALLOC_HUGE_PAGE_FAIL) {
/*
* If fail to allocate the first time, try to sleep for
* a while. When hit again, cancel the scan.
@ -2150,7 +2152,6 @@ static void khugepaged_do_scan(struct collapse_control *cc)
if (!wait)
break;
wait = false;
hpage = NULL;
khugepaged_alloc_sleep();
}
}