44 lines
1.4 KiB
Diff
44 lines
1.4 KiB
Diff
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From: Peter Zijlstra <a.p.zijlstra@chello.nl>
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Subject: [PATCH 04/31] mm: tag reseve pages
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Patch-mainline: not yet
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Tag pages allocated from the reserves with a non-zero page->reserve.
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This allows us to distinguish and account reserve pages.
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Since low-memory situations are transient, and unrelated the the actual
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page (any page can be on the freelist when we run low), don't mark the
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page in any permanent way - just pass along the information to the
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allocatee.
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Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
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Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de>
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---
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include/linux/mm_types.h | 1 +
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mm/page_alloc.c | 4 +++-
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2 files changed, 4 insertions(+), 1 deletion(-)
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--- a/include/linux/mm_types.h
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+++ b/include/linux/mm_types.h
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@@ -71,6 +71,7 @@ struct page {
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union {
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pgoff_t index; /* Our offset within mapping. */
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void *freelist; /* SLUB: freelist req. slab lock */
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+ int reserve; /* page_alloc: page is a reserve page */
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};
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struct list_head lru; /* Pageout list, eg. active_list
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* protected by zone->lru_lock !
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--- a/mm/page_alloc.c
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+++ b/mm/page_alloc.c
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@@ -1572,8 +1572,10 @@ zonelist_scan:
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try_this_zone:
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page = buffered_rmqueue(preferred_zone, zone, order,
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gfp_mask, migratetype);
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- if (page)
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+ if (page) {
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+ page->reserve = !!(alloc_flags & ALLOC_NO_WATERMARKS);
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break;
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+ }
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this_zone_full:
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if (NUMA_BUILD)
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zlc_mark_zone_full(zonelist, z);
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