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Message-ID: <20250523191258.339826-7-ziy@nvidia.com>
Date: Fri, 23 May 2025 15:12:58 -0400
From: Zi Yan <ziy@...dia.com>
To: David Hildenbrand <david@...hat.com>,
Johannes Weiner <hannes@...xchg.org>,
linux-mm@...ck.org
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Oscar Salvador <osalvador@...e.de>,
Vlastimil Babka <vbabka@...e.cz>,
Baolin Wang <baolin.wang@...ux.alibaba.com>,
"Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
Mel Gorman <mgorman@...hsingularity.net>,
Suren Baghdasaryan <surenb@...gle.com>,
Michal Hocko <mhocko@...e.com>,
Brendan Jackman <jackmanb@...gle.com>,
Richard Chang <richardycc@...gle.com>,
linux-kernel@...r.kernel.org,
Zi Yan <ziy@...dia.com>
Subject: [PATCH v5 6/6] mm/page_isolation: remove migratetype parameter from more functions.
migratetype is no longer overwritten during pageblock isolation,
start_isolate_page_range(), has_unmovable_pages(), and
set_migratetype_isolate() no longer need which migratetype to restore
during isolation failure.
For has_unmoable_pages(), it needs to know if the isolation is for CMA
allocation, so adding CMA_ALLOCATION to provide the information. At the
same time change isolation flags to enum pb_isolate_mode (MEMORY_OFFLINE,
CMA_ALLOCATION, and ISOLATE_MODE_OTHERS). Remove REPORT_FAILURE and check
MEMORY_OFFLINE instead, since only MEMORY_OFFLINE reports isolation
failures.
alloc_contig_range() no longer needs migratetype. Replace it with
a newly defined acr_flags_t to tell if an allocation is for CMA. So does
__alloc_contig_migrate_range().
Signed-off-by: Zi Yan <ziy@...dia.com>
---
drivers/virtio/virtio_mem.c | 3 +-
include/linux/gfp.h | 6 ++-
include/linux/page-isolation.h | 19 ++++++++--
include/trace/events/kmem.h | 14 ++++---
mm/cma.c | 2 +-
mm/memory_hotplug.c | 4 +-
mm/page_alloc.c | 25 ++++++-------
mm/page_isolation.c | 67 +++++++++++++++-------------------
8 files changed, 72 insertions(+), 68 deletions(-)
diff --git a/drivers/virtio/virtio_mem.c b/drivers/virtio/virtio_mem.c
index 56d0dbe62163..8accc0f255a8 100644
--- a/drivers/virtio/virtio_mem.c
+++ b/drivers/virtio/virtio_mem.c
@@ -1243,8 +1243,7 @@ static int virtio_mem_fake_offline(struct virtio_mem *vm, unsigned long pfn,
if (atomic_read(&vm->config_changed))
return -EAGAIN;
- rc = alloc_contig_range(pfn, pfn + nr_pages, MIGRATE_MOVABLE,
- GFP_KERNEL);
+ rc = alloc_contig_range(pfn, pfn + nr_pages, 0, GFP_KERNEL);
if (rc == -ENOMEM)
/* whoops, out of memory */
return rc;
diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index be160e8d8bcb..dea27ed24f8e 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -423,9 +423,13 @@ static inline bool gfp_compaction_allowed(gfp_t gfp_mask)
extern gfp_t vma_thp_gfp_mask(struct vm_area_struct *vma);
#ifdef CONFIG_CONTIG_ALLOC
+
+typedef unsigned int __bitwise acr_flags_t;
+#define ACR_CMA ((__force acr_flags_t)BIT(0)) // allocate for CMA
+
/* The below functions must be run on a range from a single zone. */
extern int alloc_contig_range_noprof(unsigned long start, unsigned long end,
- unsigned migratetype, gfp_t gfp_mask);
+ acr_flags_t alloc_flags, gfp_t gfp_mask);
#define alloc_contig_range(...) alloc_hooks(alloc_contig_range_noprof(__VA_ARGS__))
extern struct page *alloc_contig_pages_noprof(unsigned long nr_pages, gfp_t gfp_mask,
diff --git a/include/linux/page-isolation.h b/include/linux/page-isolation.h
index 7a681a49e73c..b61bca909ddc 100644
--- a/include/linux/page-isolation.h
+++ b/include/linux/page-isolation.h
@@ -38,8 +38,19 @@ static inline void set_pageblock_isolate(struct page *page)
}
#endif
-#define MEMORY_OFFLINE 0x1
-#define REPORT_FAILURE 0x2
+/*
+ * Pageblock isolation modes:
+ * MEMORY_OFFLINE - isolate to offline (!allocate) memory e.g., skip over
+ * PageHWPoison() pages and PageOffline() pages.
+ * Unmovable pages will be reported in this mode.
+ * CMA_ALLOCATION - isolate for CMA allocations
+ * ISOLATE_MODE_OTHERS - isolate for other purposes
+ */
+enum pb_isolate_mode {
+ MEMORY_OFFLINE,
+ CMA_ALLOCATION,
+ ISOLATE_MODE_OTHERS,
+};
void __meminit init_pageblock_migratetype(struct page *page,
enum migratetype migratetype,
@@ -49,10 +60,10 @@ bool pageblock_isolate_and_move_free_pages(struct zone *zone, struct page *page)
bool pageblock_unisolate_and_move_free_pages(struct zone *zone, struct page *page);
int start_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
- int migratetype, int flags);
+ enum pb_isolate_mode mode);
void undo_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn);
int test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn,
- int isol_flags);
+ enum pb_isolate_mode mode);
#endif
diff --git a/include/trace/events/kmem.h b/include/trace/events/kmem.h
index f74925a6cf69..efffcf578217 100644
--- a/include/trace/events/kmem.h
+++ b/include/trace/events/kmem.h
@@ -304,6 +304,7 @@ TRACE_EVENT(mm_page_alloc_extfrag,
__entry->change_ownership)
);
+#ifdef CONFIG_CONTIG_ALLOC
TRACE_EVENT(mm_alloc_contig_migrate_range_info,
TP_PROTO(unsigned long start,
@@ -311,9 +312,9 @@ TRACE_EVENT(mm_alloc_contig_migrate_range_info,
unsigned long nr_migrated,
unsigned long nr_reclaimed,
unsigned long nr_mapped,
- int migratetype),
+ acr_flags_t alloc_flags),
- TP_ARGS(start, end, nr_migrated, nr_reclaimed, nr_mapped, migratetype),
+ TP_ARGS(start, end, nr_migrated, nr_reclaimed, nr_mapped, alloc_flags),
TP_STRUCT__entry(
__field(unsigned long, start)
@@ -321,7 +322,7 @@ TRACE_EVENT(mm_alloc_contig_migrate_range_info,
__field(unsigned long, nr_migrated)
__field(unsigned long, nr_reclaimed)
__field(unsigned long, nr_mapped)
- __field(int, migratetype)
+ __field(acr_flags_t, alloc_flags)
),
TP_fast_assign(
@@ -330,17 +331,18 @@ TRACE_EVENT(mm_alloc_contig_migrate_range_info,
__entry->nr_migrated = nr_migrated;
__entry->nr_reclaimed = nr_reclaimed;
__entry->nr_mapped = nr_mapped;
- __entry->migratetype = migratetype;
+ __entry->alloc_flags = alloc_flags;
),
- TP_printk("start=0x%lx end=0x%lx migratetype=%d nr_migrated=%lu nr_reclaimed=%lu nr_mapped=%lu",
+ TP_printk("start=0x%lx end=0x%lx alloc_flags=%d nr_migrated=%lu nr_reclaimed=%lu nr_mapped=%lu",
__entry->start,
__entry->end,
- __entry->migratetype,
+ __entry->alloc_flags,
__entry->nr_migrated,
__entry->nr_reclaimed,
__entry->nr_mapped)
);
+#endif
TRACE_EVENT(mm_setup_per_zone_wmarks,
diff --git a/mm/cma.c b/mm/cma.c
index 397567883a10..9ee8fad797bc 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -822,7 +822,7 @@ static int cma_range_alloc(struct cma *cma, struct cma_memrange *cmr,
pfn = cmr->base_pfn + (bitmap_no << cma->order_per_bit);
mutex_lock(&cma->alloc_mutex);
- ret = alloc_contig_range(pfn, pfn + count, MIGRATE_CMA, gfp);
+ ret = alloc_contig_range(pfn, pfn + count, ACR_CMA, gfp);
mutex_unlock(&cma->alloc_mutex);
if (ret == 0) {
page = pfn_to_page(pfn);
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index ab66acd3e6b3..44f140dee0ce 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -2008,9 +2008,7 @@ int offline_pages(unsigned long start_pfn, unsigned long nr_pages,
lru_cache_disable();
/* set above range as isolated */
- ret = start_isolate_page_range(start_pfn, end_pfn,
- MIGRATE_MOVABLE,
- MEMORY_OFFLINE | REPORT_FAILURE);
+ ret = start_isolate_page_range(start_pfn, end_pfn, MEMORY_OFFLINE);
if (ret) {
reason = "failure to isolate range";
goto failed_removal_pcplists_disabled;
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 499c3f40851f..48f458f7143a 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -6720,11 +6720,12 @@ static void alloc_contig_dump_pages(struct list_head *page_list)
/*
* [start, end) must belong to a single zone.
- * @migratetype: using migratetype to filter the type of migration in
+ * @alloc_flags: using acr_flags_t to filter the type of migration in
* trace_mm_alloc_contig_migrate_range_info.
*/
static int __alloc_contig_migrate_range(struct compact_control *cc,
- unsigned long start, unsigned long end, int migratetype)
+ unsigned long start, unsigned long end,
+ acr_flags_t alloc_flags)
{
/* This function is based on compact_zone() from compaction.c. */
unsigned int nr_reclaimed;
@@ -6796,7 +6797,7 @@ static int __alloc_contig_migrate_range(struct compact_control *cc,
putback_movable_pages(&cc->migratepages);
}
- trace_mm_alloc_contig_migrate_range_info(start, end, migratetype,
+ trace_mm_alloc_contig_migrate_range_info(start, end, alloc_flags,
total_migrated,
total_reclaimed,
total_mapped);
@@ -6867,10 +6868,7 @@ static int __alloc_contig_verify_gfp_mask(gfp_t gfp_mask, gfp_t *gfp_cc_mask)
* alloc_contig_range() -- tries to allocate given range of pages
* @start: start PFN to allocate
* @end: one-past-the-last PFN to allocate
- * @migratetype: migratetype of the underlying pageblocks (either
- * #MIGRATE_MOVABLE or #MIGRATE_CMA). All pageblocks
- * in range must have the same migratetype and it must
- * be either of the two.
+ * @alloc_flags: allocation information
* @gfp_mask: GFP mask. Node/zone/placement hints are ignored; only some
* action and reclaim modifiers are supported. Reclaim modifiers
* control allocation behavior during compaction/migration/reclaim.
@@ -6887,7 +6885,7 @@ static int __alloc_contig_verify_gfp_mask(gfp_t gfp_mask, gfp_t *gfp_cc_mask)
* need to be freed with free_contig_range().
*/
int alloc_contig_range_noprof(unsigned long start, unsigned long end,
- unsigned migratetype, gfp_t gfp_mask)
+ acr_flags_t alloc_flags, gfp_t gfp_mask)
{
unsigned long outer_start, outer_end;
int ret = 0;
@@ -6903,6 +6901,8 @@ int alloc_contig_range_noprof(unsigned long start, unsigned long end,
};
INIT_LIST_HEAD(&cc.migratepages);
bool is_range_aligned;
+ isolate_mode_t mode = (alloc_flags & ACR_CMA) ? CMA_ALLOCATION :
+ ISOLATE_MODE_OTHERS;
gfp_mask = current_gfp_context(gfp_mask);
if (__alloc_contig_verify_gfp_mask(gfp_mask, (gfp_t *)&cc.gfp_mask))
@@ -6929,7 +6929,7 @@ int alloc_contig_range_noprof(unsigned long start, unsigned long end,
* put back to page allocator so that buddy can use them.
*/
- ret = start_isolate_page_range(start, end, migratetype, 0);
+ ret = start_isolate_page_range(start, end, mode);
if (ret)
goto done;
@@ -6945,7 +6945,7 @@ int alloc_contig_range_noprof(unsigned long start, unsigned long end,
* allocated. So, if we fall through be sure to clear ret so that
* -EBUSY is not accidentally used or returned to caller.
*/
- ret = __alloc_contig_migrate_range(&cc, start, end, migratetype);
+ ret = __alloc_contig_migrate_range(&cc, start, end, alloc_flags);
if (ret && ret != -EBUSY)
goto done;
@@ -6979,7 +6979,7 @@ int alloc_contig_range_noprof(unsigned long start, unsigned long end,
outer_start = find_large_buddy(start);
/* Make sure the range is really isolated. */
- if (test_pages_isolated(outer_start, end, 0)) {
+ if (test_pages_isolated(outer_start, end, mode)) {
ret = -EBUSY;
goto done;
}
@@ -7037,8 +7037,7 @@ static int __alloc_contig_pages(unsigned long start_pfn,
{
unsigned long end_pfn = start_pfn + nr_pages;
- return alloc_contig_range_noprof(start_pfn, end_pfn, MIGRATE_MOVABLE,
- gfp_mask);
+ return alloc_contig_range_noprof(start_pfn, end_pfn, 0, gfp_mask);
}
static bool pfn_range_valid_contig(struct zone *z, unsigned long start_pfn,
diff --git a/mm/page_isolation.c b/mm/page_isolation.c
index 1edfef408faf..bcf6525ea238 100644
--- a/mm/page_isolation.c
+++ b/mm/page_isolation.c
@@ -31,7 +31,7 @@
*
*/
static struct page *has_unmovable_pages(unsigned long start_pfn, unsigned long end_pfn,
- int migratetype, int flags)
+ enum pb_isolate_mode mode)
{
struct page *page = pfn_to_page(start_pfn);
struct zone *zone = page_zone(page);
@@ -46,7 +46,7 @@ static struct page *has_unmovable_pages(unsigned long start_pfn, unsigned long e
* isolate CMA pageblocks even when they are not movable in fact
* so consider them movable here.
*/
- if (is_migrate_cma(migratetype))
+ if (mode == CMA_ALLOCATION)
return NULL;
return page;
@@ -117,7 +117,7 @@ static struct page *has_unmovable_pages(unsigned long start_pfn, unsigned long e
* The HWPoisoned page may be not in buddy system, and
* page_count() is not 0.
*/
- if ((flags & MEMORY_OFFLINE) && PageHWPoison(page))
+ if ((mode == MEMORY_OFFLINE) && PageHWPoison(page))
continue;
/*
@@ -130,7 +130,7 @@ static struct page *has_unmovable_pages(unsigned long start_pfn, unsigned long e
* move these pages that still have a reference count > 0.
* (false negatives in this function only)
*/
- if ((flags & MEMORY_OFFLINE) && PageOffline(page))
+ if ((mode == MEMORY_OFFLINE) && PageOffline(page))
continue;
if (__PageMovable(page) || PageLRU(page))
@@ -151,7 +151,7 @@ static struct page *has_unmovable_pages(unsigned long start_pfn, unsigned long e
* present in [start_pfn, end_pfn). The pageblock must intersect with
* [start_pfn, end_pfn).
*/
-static int set_migratetype_isolate(struct page *page, int migratetype, int isol_flags,
+static int set_migratetype_isolate(struct page *page, enum pb_isolate_mode mode,
unsigned long start_pfn, unsigned long end_pfn)
{
struct zone *zone = page_zone(page);
@@ -186,7 +186,7 @@ static int set_migratetype_isolate(struct page *page, int migratetype, int isol_
end_pfn);
unmovable = has_unmovable_pages(check_unmovable_start, check_unmovable_end,
- migratetype, isol_flags);
+ mode);
if (!unmovable) {
if (!pageblock_isolate_and_move_free_pages(zone, page)) {
spin_unlock_irqrestore(&zone->lock, flags);
@@ -198,7 +198,7 @@ static int set_migratetype_isolate(struct page *page, int migratetype, int isol_
}
spin_unlock_irqrestore(&zone->lock, flags);
- if (isol_flags & REPORT_FAILURE) {
+ if (mode == MEMORY_OFFLINE) {
/*
* printk() with zone->lock held will likely trigger a
* lockdep splat, so defer it here.
@@ -292,11 +292,10 @@ __first_valid_page(unsigned long pfn, unsigned long nr_pages)
* isolate_single_pageblock() -- tries to isolate a pageblock that might be
* within a free or in-use page.
* @boundary_pfn: pageblock-aligned pfn that a page might cross
- * @flags: isolation flags
+ * @mode: isolation mode
* @isolate_before: isolate the pageblock before the boundary_pfn
* @skip_isolation: the flag to skip the pageblock isolation in second
* isolate_single_pageblock()
- * @migratetype: migrate type to set in error recovery.
*
* Free and in-use pages can be as big as MAX_PAGE_ORDER and contain more than one
* pageblock. When not all pageblocks within a page are isolated at the same
@@ -311,8 +310,9 @@ __first_valid_page(unsigned long pfn, unsigned long nr_pages)
* either. The function handles this by splitting the free page or migrating
* the in-use page then splitting the free page.
*/
-static int isolate_single_pageblock(unsigned long boundary_pfn, int flags,
- bool isolate_before, bool skip_isolation, int migratetype)
+static int isolate_single_pageblock(unsigned long boundary_pfn,
+ enum pb_isolate_mode mode, bool isolate_before,
+ bool skip_isolation)
{
unsigned long start_pfn;
unsigned long isolate_pageblock;
@@ -338,12 +338,11 @@ static int isolate_single_pageblock(unsigned long boundary_pfn, int flags,
zone->zone_start_pfn);
if (skip_isolation) {
- int mt __maybe_unused = get_pageblock_migratetype(pfn_to_page(isolate_pageblock));
-
- VM_BUG_ON(!is_migrate_isolate(mt));
+ VM_BUG_ON(!get_pageblock_isolate(pfn_to_page(isolate_pageblock)));
} else {
- ret = set_migratetype_isolate(pfn_to_page(isolate_pageblock), migratetype,
- flags, isolate_pageblock, isolate_pageblock + pageblock_nr_pages);
+ ret = set_migratetype_isolate(pfn_to_page(isolate_pageblock),
+ mode, isolate_pageblock,
+ isolate_pageblock + pageblock_nr_pages);
if (ret)
return ret;
@@ -441,14 +440,7 @@ static int isolate_single_pageblock(unsigned long boundary_pfn, int flags,
* start_isolate_page_range() - mark page range MIGRATE_ISOLATE
* @start_pfn: The first PFN of the range to be isolated.
* @end_pfn: The last PFN of the range to be isolated.
- * @migratetype: Migrate type to set in error recovery.
- * @flags: The following flags are allowed (they can be combined in
- * a bit mask)
- * MEMORY_OFFLINE - isolate to offline (!allocate) memory
- * e.g., skip over PageHWPoison() pages
- * and PageOffline() pages.
- * REPORT_FAILURE - report details about the failure to
- * isolate the range
+ * @mode: isolation mode
*
* Making page-allocation-type to be MIGRATE_ISOLATE means free pages in
* the range will never be allocated. Any free pages and pages freed in the
@@ -481,7 +473,7 @@ static int isolate_single_pageblock(unsigned long boundary_pfn, int flags,
* Return: 0 on success and -EBUSY if any part of range cannot be isolated.
*/
int start_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
- int migratetype, int flags)
+ enum pb_isolate_mode mode)
{
unsigned long pfn;
struct page *page;
@@ -492,8 +484,8 @@ int start_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
bool skip_isolation = false;
/* isolate [isolate_start, isolate_start + pageblock_nr_pages) pageblock */
- ret = isolate_single_pageblock(isolate_start, flags, false,
- skip_isolation, migratetype);
+ ret = isolate_single_pageblock(isolate_start, mode, false,
+ skip_isolation);
if (ret)
return ret;
@@ -501,8 +493,7 @@ int start_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
skip_isolation = true;
/* isolate [isolate_end - pageblock_nr_pages, isolate_end) pageblock */
- ret = isolate_single_pageblock(isolate_end, flags, true,
- skip_isolation, migratetype);
+ ret = isolate_single_pageblock(isolate_end, mode, true, skip_isolation);
if (ret) {
unset_migratetype_isolate(pfn_to_page(isolate_start));
return ret;
@@ -513,8 +504,8 @@ int start_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
pfn < isolate_end - pageblock_nr_pages;
pfn += pageblock_nr_pages) {
page = __first_valid_page(pfn, pageblock_nr_pages);
- if (page && set_migratetype_isolate(page, migratetype, flags,
- start_pfn, end_pfn)) {
+ if (page && set_migratetype_isolate(page, mode, start_pfn,
+ end_pfn)) {
undo_isolate_page_range(isolate_start, pfn);
unset_migratetype_isolate(
pfn_to_page(isolate_end - pageblock_nr_pages));
@@ -556,7 +547,7 @@ void undo_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn)
*/
static unsigned long
__test_page_isolated_in_pageblock(unsigned long pfn, unsigned long end_pfn,
- int flags)
+ enum pb_isolate_mode mode)
{
struct page *page;
@@ -569,10 +560,10 @@ __test_page_isolated_in_pageblock(unsigned long pfn, unsigned long end_pfn,
* simple way to verify that as VM_BUG_ON(), though.
*/
pfn += 1 << buddy_order(page);
- else if ((flags & MEMORY_OFFLINE) && PageHWPoison(page))
+ else if ((mode == MEMORY_OFFLINE) && PageHWPoison(page))
/* A HWPoisoned page cannot be also PageBuddy */
pfn++;
- else if ((flags & MEMORY_OFFLINE) && PageOffline(page) &&
+ else if ((mode == MEMORY_OFFLINE) && PageOffline(page) &&
!page_count(page))
/*
* The responsible driver agreed to skip PageOffline()
@@ -591,11 +582,11 @@ __test_page_isolated_in_pageblock(unsigned long pfn, unsigned long end_pfn,
* test_pages_isolated - check if pageblocks in range are isolated
* @start_pfn: The first PFN of the isolated range
* @end_pfn: The first PFN *after* the isolated range
- * @isol_flags: Testing mode flags
+ * @mode: Testing mode
*
* This tests if all in the specified range are free.
*
- * If %MEMORY_OFFLINE is specified in @flags, it will consider
+ * If %MEMORY_OFFLINE is specified in @mode, it will consider
* poisoned and offlined pages free as well.
*
* Caller must ensure the requested range doesn't span zones.
@@ -603,7 +594,7 @@ __test_page_isolated_in_pageblock(unsigned long pfn, unsigned long end_pfn,
* Returns 0 if true, -EBUSY if one or more pages are in use.
*/
int test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn,
- int isol_flags)
+ enum pb_isolate_mode mode)
{
unsigned long pfn, flags;
struct page *page;
@@ -639,7 +630,7 @@ int test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn,
/* Check all pages are free or marked as ISOLATED */
zone = page_zone(page);
spin_lock_irqsave(&zone->lock, flags);
- pfn = __test_page_isolated_in_pageblock(start_pfn, end_pfn, isol_flags);
+ pfn = __test_page_isolated_in_pageblock(start_pfn, end_pfn, mode);
spin_unlock_irqrestore(&zone->lock, flags);
ret = pfn < end_pfn ? -EBUSY : 0;
--
2.47.2
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