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 isolation flags to provide the
information.
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@nvidia.com>
---
drivers/virtio/virtio_mem.c | 3 +-
include/linux/gfp.h | 6 ++-
include/linux/page-isolation.h | 25 +++++++++++--
include/trace/events/kmem.h | 14 ++++---
mm/cma.c | 2 +-
mm/memory_hotplug.c | 3 +-
mm/page_alloc.c | 25 ++++++-------
mm/page_isolation.c | 67 ++++++++++++++++------------------
8 files changed, 80 insertions(+), 65 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 c9fa6309c903..db4be1861736 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 5e6538ab74f0..7aed5bf18cc6 100644
--- a/include/linux/page-isolation.h
+++ b/include/linux/page-isolation.h
@@ -22,8 +22,25 @@ static inline bool is_migrate_isolate(int migratetype)
}
#endif
-#define MEMORY_OFFLINE 0x1
-#define REPORT_FAILURE 0x2
+/*
+ * Isolation modes:
+ * ISOLATE_MODE_NONE - isolate for other purposes than those below
+ * MEMORY_OFFLINE - isolate to offline (!allocate) memory e.g., skip over
+ * PageHWPoison() pages and PageOffline() pages.
+ * CMA_ALLOCATION - isolate for CMA allocations
+ */
+enum isolate_mode_t {
+ ISOLATE_MODE_NONE,
+ MEMORY_OFFLINE,
+ CMA_ALLOCATION,
+};
+
+/*
+ * Isolation flags:
+ * REPORT_FAILURE - report details about the failure to isolate the range
+ */
+typedef unsigned int __bitwise isolate_flags_t;
+#define REPORT_FAILURE ((__force isolate_flags_t)BIT(0))
void set_pageblock_migratetype(struct page *page, int migratetype);
void set_pageblock_isolate(struct page *page);
@@ -32,10 +49,10 @@ 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);
+ isolate_mode_t mode, isolate_flags_t flags);
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);
+ isolate_mode_t 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 15632939f20a..8606bfe19e5d 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -818,7 +818,7 @@ 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 e63e115e2c08..029a65b6ad27 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -2010,8 +2010,7 @@ int offline_pages(unsigned long start_pfn, unsigned long nr_pages,
/* set above range as isolated */
ret = start_isolate_page_range(start_pfn, end_pfn,
- MIGRATE_MOVABLE,
- MEMORY_OFFLINE | REPORT_FAILURE);
+ MEMORY_OFFLINE, REPORT_FAILURE);
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 8ff7937e932a..b3476e0f59ad 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -6580,11 +6580,12 @@ 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;
@@ -6656,7 +6657,7 @@ 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);
@@ -6727,10 +6728,7 @@ 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.
@@ -6747,7 +6745,7 @@ 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;
@@ -6763,6 +6761,8 @@ 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_NONE;
gfp_mask = current_gfp_context(gfp_mask);
if (__alloc_contig_verify_gfp_mask(gfp_mask, (gfp_t *)&cc.gfp_mask))
@@ -6789,7 +6789,7 @@ 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, 0);
if (ret)
goto done;
@@ -6805,7 +6805,7 @@ 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;
@@ -6839,7 +6839,7 @@ 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;
}
@@ -6897,8 +6897,7 @@ 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 7b9b76620a96..71ed918deeb3 100644
--- a/mm/page_isolation.c
+++ b/mm/page_isolation.c
@@ -48,7 +48,7 @@ void set_pageblock_isolate(struct page *page)
*
*/
static struct page *has_unmovable_pages(unsigned long start_pfn, unsigned long end_pfn,
- int migratetype, int flags)
+ isolate_mode_t mode, isolate_flags_t flags)
{
struct page *page = pfn_to_page(start_pfn);
struct zone *zone = page_zone(page);
@@ -63,7 +63,7 @@ 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;
@@ -134,7 +134,7 @@ 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;
/*
@@ -147,7 +147,7 @@ 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))
@@ -168,8 +168,9 @@ 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,
- unsigned long start_pfn, unsigned long end_pfn)
+static int set_migratetype_isolate(struct page *page, isolate_mode_t mode,
+ isolate_flags_t isol_flags, unsigned long start_pfn,
+ unsigned long end_pfn)
{
struct zone *zone = page_zone(page);
struct page *unmovable;
@@ -203,7 +204,7 @@ 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, isol_flags);
if (!unmovable) {
if (!pageblock_isolate_and_move_free_pages(zone, page)) {
spin_unlock_irqrestore(&zone->lock, flags);
@@ -309,11 +310,11 @@ __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
+ * @mode: isolation mode
* @flags: isolation flags
* @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
@@ -328,8 +329,9 @@ __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,
+ isolate_mode_t mode, isolate_flags_t flags,
+ bool isolate_before, bool skip_isolation)
{
unsigned long start_pfn;
unsigned long isolate_pageblock;
@@ -355,12 +357,11 @@ 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, flags, isolate_pageblock,
+ isolate_pageblock + pageblock_nr_pages);
if (ret)
return ret;
@@ -458,14 +459,8 @@ 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
+ * @flags: isolation flags
*
* 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
@@ -498,7 +493,7 @@ 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)
+ isolate_mode_t mode, isolate_flags_t flags)
{
unsigned long pfn;
struct page *page;
@@ -509,8 +504,8 @@ 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, flags, false,
+ skip_isolation);
if (ret)
return ret;
@@ -518,8 +513,8 @@ 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, flags, true,
+ skip_isolation);
if (ret) {
unset_migratetype_isolate(pfn_to_page(isolate_start));
return ret;
@@ -530,7 +525,7 @@ 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,
+ if (page && set_migratetype_isolate(page, mode, flags,
start_pfn, end_pfn)) {
undo_isolate_page_range(isolate_start, pfn);
unset_migratetype_isolate(
@@ -573,7 +568,7 @@ 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)
+ isolate_mode_t mode)
{
struct page *page;
@@ -586,10 +581,10 @@ __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()
@@ -608,11 +603,11 @@ __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.
@@ -620,7 +615,7 @@ __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)
+ isolate_mode_t mode)
{
unsigned long pfn, flags;
struct page *page;
@@ -656,7 +651,7 @@ 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;
--
2.47.2On Fri, May 09, 2025 at 04:01:11PM -0400, Zi Yan wrote:
> @@ -22,8 +22,25 @@ static inline bool is_migrate_isolate(int migratetype)
> }
> #endif
>
> -#define MEMORY_OFFLINE 0x1
> -#define REPORT_FAILURE 0x2
> +/*
> + * Isolation modes:
> + * ISOLATE_MODE_NONE - isolate for other purposes than those below
> + * MEMORY_OFFLINE - isolate to offline (!allocate) memory e.g., skip over
> + * PageHWPoison() pages and PageOffline() pages.
> + * CMA_ALLOCATION - isolate for CMA allocations
> + */
> +enum isolate_mode_t {
> + ISOLATE_MODE_NONE,
> + MEMORY_OFFLINE,
> + CMA_ALLOCATION,
> +};
> +
> +/*
> + * Isolation flags:
> + * REPORT_FAILURE - report details about the failure to isolate the range
> + */
> +typedef unsigned int __bitwise isolate_flags_t;
> +#define REPORT_FAILURE ((__force isolate_flags_t)BIT(0))
>
> void set_pageblock_migratetype(struct page *page, int migratetype);
> void set_pageblock_isolate(struct page *page);
> @@ -32,10 +49,10 @@ 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);
> + isolate_mode_t mode, isolate_flags_t flags);
This should be 'enum isolate_mode_t', right?
(isolate_mode_t also exists, but it's something else)
On 18 May 2025, at 12:32, Johannes Weiner wrote:
> On Fri, May 09, 2025 at 04:01:11PM -0400, Zi Yan wrote:
>> @@ -22,8 +22,25 @@ static inline bool is_migrate_isolate(int migratetype)
>> }
>> #endif
>>
>> -#define MEMORY_OFFLINE 0x1
>> -#define REPORT_FAILURE 0x2
>> +/*
>> + * Isolation modes:
>> + * ISOLATE_MODE_NONE - isolate for other purposes than those below
>> + * MEMORY_OFFLINE - isolate to offline (!allocate) memory e.g., skip over
>> + * PageHWPoison() pages and PageOffline() pages.
>> + * CMA_ALLOCATION - isolate for CMA allocations
>> + */
>> +enum isolate_mode_t {
>> + ISOLATE_MODE_NONE,
>> + MEMORY_OFFLINE,
>> + CMA_ALLOCATION,
>> +};
>> +
>> +/*
>> + * Isolation flags:
>> + * REPORT_FAILURE - report details about the failure to isolate the range
>> + */
>> +typedef unsigned int __bitwise isolate_flags_t;
>> +#define REPORT_FAILURE ((__force isolate_flags_t)BIT(0))
>>
>> void set_pageblock_migratetype(struct page *page, int migratetype);
>> void set_pageblock_isolate(struct page *page);
>> @@ -32,10 +49,10 @@ 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);
>> + isolate_mode_t mode, isolate_flags_t flags);
>
> This should be 'enum isolate_mode_t', right?
>
> (isolate_mode_t also exists, but it's something else)
Oh, I did not realize that. Let me rename it to pb_isolate_mode_t.
Thanks.
--
Best Regards,
Yan, Zi
On 5/9/25 22:01, Zi Yan wrote: > 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 isolation flags to provide the > information. > > 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@nvidia.com> AFAICS has_unmovable_pages() adds the flags parameter but doesn't use it. But also, I think having both mode and flags is just unnecessary complexity in this case? CMA_ALLOCATION could be just a new flag? Even if some flag combinations wouldn't logicaly make sense, this has only so few users so we don't have to care to make them exclusive with the mode thing. Also I think REPORT_FAILURE is only used with MEMORY_OFFLINE so it could be squashed?
On 17 May 2025, at 16:21, Vlastimil Babka wrote: > On 5/9/25 22:01, Zi Yan wrote: >> 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 isolation flags to provide the >> information. >> >> 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@nvidia.com> > > AFAICS has_unmovable_pages() adds the flags parameter but doesn't use it. Yes, will remove it. > > But also, I think having both mode and flags is just unnecessary complexity > in this case? CMA_ALLOCATION could be just a new flag? Even if some flag > combinations wouldn't logicaly make sense, this has only so few users so we > don't have to care to make them exclusive with the mode thing. I was doing that until v3. > Also I think REPORT_FAILURE is only used with MEMORY_OFFLINE so it could be > squashed? Yes, let me do that. Johannes also pointed this out but I missed it. In the next version, I will remove REPORT_FAILURE as it is implied by MEMORY_OFFLINE, including isolate_flags_t, and keep the existing enum with MEMORY_OFFLINE and CMA_ALLOCATION. Thanks for the review. -- Best Regards, Yan, Zi
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