The following functions are shared between khugepaged and madvise
collapse contexts. Replace the "khugepaged_" prefix with generic
"hpage_collapse_" prefix in such cases:
khugepaged_test_exit() -> hpage_collapse_test_exit()
khugepaged_scan_abort() -> hpage_collapse_scan_abort()
khugepaged_scan_pmd() -> hpage_collapse_scan_pmd()
khugepaged_find_target_node() -> hpage_collapse_find_target_node()
khugepaged_alloc_page() -> hpage_collapse_alloc_page()
The kerenel ABI (e.g. huge_memory:mm_khugepaged_scan_pmd tracepoint)
is unaltered.
Signed-off-by: Zach O'Keefe <zokeefe@xxxxxxxxxx>
Reviewed-by: Yang Shi <shy828301@xxxxxxxxx>
---
mm/khugepaged.c | 68 +++++++++++++++++++++++++------------------------
1 file changed, 35 insertions(+), 33 deletions(-)
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 2b2d832e44f2..e0d00180512c 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -94,7 +94,7 @@ struct collapse_control {
/* Num pages scanned per node */
int node_load[MAX_NUMNODES];
- /* Last target selected in khugepaged_find_target_node() */
+ /* Last target selected in hpage_collapse_find_target_node() */
int last_target_node;
};
@@ -438,7 +438,7 @@ static void insert_to_mm_slots_hash(struct mm_struct *mm,
hash_add(mm_slots_hash, &mm_slot->hash, (long)mm);
}
-static inline int khugepaged_test_exit(struct mm_struct *mm)
+static inline int hpage_collapse_test_exit(struct mm_struct *mm)
{
return atomic_read(&mm->mm_users) == 0;
}
@@ -453,7 +453,7 @@ void __khugepaged_enter(struct mm_struct *mm)
return;
/* __khugepaged_exit() must not run from under us */
- VM_BUG_ON_MM(khugepaged_test_exit(mm), mm);
+ VM_BUG_ON_MM(hpage_collapse_test_exit(mm), mm);
if (unlikely(test_and_set_bit(MMF_VM_HUGEPAGE, &mm->flags))) {
free_mm_slot(mm_slot);
return;
@@ -505,11 +505,10 @@ void __khugepaged_exit(struct mm_struct *mm)
} else if (mm_slot) {
/*
* This is required to serialize against
- * khugepaged_test_exit() (which is guaranteed to run
- * under mmap sem read mode). Stop here (after we
- * return all pagetables will be destroyed) until
- * khugepaged has finished working on the pagetables
- * under the mmap_lock.
+ * hpage_collapse_test_exit() (which is guaranteed to run
+ * under mmap sem read mode). Stop here (after we return all
+ * pagetables will be destroyed) until khugepaged has finished
+ * working on the pagetables under the mmap_lock.
*/
mmap_write_lock(mm);
mmap_write_unlock(mm);
@@ -754,13 +753,12 @@ static void khugepaged_alloc_sleep(void)
remove_wait_queue(&khugepaged_wait, &wait);
}
-
struct collapse_control khugepaged_collapse_control = {
.is_khugepaged = true,
.last_target_node = NUMA_NO_NODE,
};
-static bool khugepaged_scan_abort(int nid, struct collapse_control *cc)
+static bool hpage_collapse_scan_abort(int nid, struct collapse_control *cc)
{
int i;
@@ -795,7 +793,7 @@ static inline gfp_t alloc_hugepage_khugepaged_gfpmask(void)
}
#ifdef CONFIG_NUMA
-static int khugepaged_find_target_node(struct collapse_control *cc)
+static int hpage_collapse_find_target_node(struct collapse_control *cc)
{
int nid, target_node = 0, max_value = 0;
@@ -819,13 +817,13 @@ static int khugepaged_find_target_node(struct collapse_control *cc)
return target_node;
}
#else
-static int khugepaged_find_target_node(struct collapse_control *cc)
+static int hpage_collapse_find_target_node(struct collapse_control *cc)
{
return 0;
}
#endif
-static bool khugepaged_alloc_page(struct page **hpage, gfp_t gfp, int node)
+static bool hpage_collapse_alloc_page(struct page **hpage, gfp_t gfp, int node)
{
*hpage = __alloc_pages_node(node, gfp, HPAGE_PMD_ORDER);
if (unlikely(!*hpage)) {
@@ -850,7 +848,7 @@ static int hugepage_vma_revalidate(struct mm_struct *mm, unsigned long address,
{
struct vm_area_struct *vma;
- if (unlikely(khugepaged_test_exit(mm)))
+ if (unlikely(hpage_collapse_test_exit(mm)))
return SCAN_ANY_PROCESS;
*vmap = vma = find_vma(mm, address);
@@ -913,7 +911,7 @@ static int check_pmd_still_valid(struct mm_struct *mm,
/*
* Bring missing pages in from swap, to complete THP collapse.
- * Only done if khugepaged_scan_pmd believes it is worthwhile.
+ * Only done if hpage_collapse_scan_pmd believes it is worthwhile.
*
* Called and returns without pte mapped or spinlocks held.
* Note that if false is returned, mmap_lock will be released.
@@ -978,9 +976,9 @@ static int alloc_charge_hpage(struct page **hpage, struct mm_struct *mm,
/* Only allocate from the target node */
gfp_t gfp = (cc->is_khugepaged ? alloc_hugepage_khugepaged_gfpmask() :
GFP_TRANSHUGE) | __GFP_THISNODE;
- int node = khugepaged_find_target_node(cc);
+ int node = hpage_collapse_find_target_node(cc);
- if (!khugepaged_alloc_page(hpage, gfp, node))
+ if (!hpage_collapse_alloc_page(hpage, gfp, node))
return SCAN_ALLOC_HUGE_PAGE_FAIL;
if (unlikely(mem_cgroup_charge(page_folio(*hpage), mm, gfp)))
return SCAN_CGROUP_CHARGE_FAIL;
@@ -1140,9 +1138,10 @@ static int collapse_huge_page(struct mm_struct *mm, unsigned long address,
return result;
}
-static int khugepaged_scan_pmd(struct mm_struct *mm, struct vm_area_struct *vma,
- unsigned long address, bool *mmap_locked,
- struct collapse_control *cc)
+static int hpage_collapse_scan_pmd(struct mm_struct *mm,
+ struct vm_area_struct *vma,
+ unsigned long address, bool *mmap_locked,
+ struct collapse_control *cc)
{
pmd_t *pmd;
pte_t *pte, *_pte;
@@ -1234,7 +1233,7 @@ static int khugepaged_scan_pmd(struct mm_struct *mm, struct vm_area_struct *vma,
* hit record.
*/
node = page_to_nid(page);
- if (khugepaged_scan_abort(node, cc)) {
+ if (hpage_collapse_scan_abort(node, cc)) {
result = SCAN_SCAN_ABORT;
goto out_unmap;
}
@@ -1313,7 +1312,7 @@ static void collect_mm_slot(struct mm_slot *mm_slot)
lockdep_assert_held(&khugepaged_mm_lock);
- if (khugepaged_test_exit(mm)) {
+ if (hpage_collapse_test_exit(mm)) {
/* free mm_slot */
hash_del(&mm_slot->hash);
list_del(&mm_slot->mm_node);
@@ -1486,7 +1485,7 @@ static void khugepaged_collapse_pte_mapped_thps(struct mm_slot *mm_slot)
if (!mmap_write_trylock(mm))
return;
- if (unlikely(khugepaged_test_exit(mm)))
+ if (unlikely(hpage_collapse_test_exit(mm)))
goto out;
for (i = 0; i < mm_slot->nr_pte_mapped_thp; i++)
@@ -1548,7 +1547,8 @@ static void retract_page_tables(struct address_space *mapping, pgoff_t pgoff)
* it'll always mapped in small page size for uffd-wp
* registered ranges.
*/
- if (!khugepaged_test_exit(mm) && !userfaultfd_wp(vma))
+ if (!hpage_collapse_test_exit(mm) &&
+ !userfaultfd_wp(vma))
collapse_and_free_pmd(mm, vma, addr, pmd);
mmap_write_unlock(mm);
} else {
@@ -1975,7 +1975,7 @@ static int khugepaged_scan_file(struct mm_struct *mm, struct file *file,
}
node = page_to_nid(page);
- if (khugepaged_scan_abort(node, cc)) {
+ if (hpage_collapse_scan_abort(node, cc)) {
result = SCAN_SCAN_ABORT;
break;
}
@@ -2069,7 +2069,7 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages, int *result,
goto breakouterloop_mmap_lock;
progress++;
- if (unlikely(khugepaged_test_exit(mm)))
+ if (unlikely(hpage_collapse_test_exit(mm)))
goto breakouterloop;
address = khugepaged_scan.address;
@@ -2078,7 +2078,7 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages, int *result,
unsigned long hstart, hend;
cond_resched();
- if (unlikely(khugepaged_test_exit(mm))) {
+ if (unlikely(hpage_collapse_test_exit(mm))) {
progress++;
break;
}
@@ -2099,7 +2099,7 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages, int *result,
bool mmap_locked = true;
cond_resched();
- if (unlikely(khugepaged_test_exit(mm)))
+ if (unlikely(hpage_collapse_test_exit(mm)))
goto breakouterloop;
VM_BUG_ON(khugepaged_scan.address < hstart ||
@@ -2116,9 +2116,10 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages, int *result,
mmap_locked = false;
fput(file);
} else {
- *result = khugepaged_scan_pmd(mm, vma,
- khugepaged_scan.address,
- &mmap_locked, cc);
+ *result = hpage_collapse_scan_pmd(mm, vma,
+ khugepaged_scan.address,
+ &mmap_locked,
+ cc);
}
if (*result == SCAN_SUCCEED)
++khugepaged_pages_collapsed;
@@ -2148,7 +2149,7 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages, int *result,
* Release the current mm_slot if this mm is about to die, or
* if we scanned all vmas of this mm.
*/
- if (khugepaged_test_exit(mm) || !vma) {
+ if (hpage_collapse_test_exit(mm) || !vma) {
/*
* Make sure that if mm_users is reaching zero while
* khugepaged runs here, khugepaged_exit will find
@@ -2432,7 +2433,8 @@ int madvise_collapse(struct vm_area_struct *vma, struct vm_area_struct **prev,
}
mmap_assert_locked(mm);
memset(cc->node_load, 0, sizeof(cc->node_load));
- result = khugepaged_scan_pmd(mm, vma, addr, &mmap_locked, cc);
+ result = hpage_collapse_scan_pmd(mm, vma, addr, &mmap_locked,
+ cc);
if (!mmap_locked)
*prev = NULL; /* Tell caller we dropped mmap_lock */
--
2.37.0.rc0.161.g10f37bed90-goog
