projects / people / pmueller / ipfire-2.x.git / blame
| Commit | Line | Data |
|---|---|---|
| 00e5a55c BS |
1 | From: Peter Zijlstra <a.p.zijlstra@chello.nl> |
| 2 | Subject: mm: tag reseve pages | |
| 3 | Patch-mainline: No | |
| 4 | References: FATE#303834 | |
| 5 | ||
| 6 | Tag pages allocated from the reserves with a non-zero page->reserve. | |
| 7 | This allows us to distinguish and account reserve pages. | |
| 8 | ||
| 9 | Since low-memory situations are transient, and unrelated the the actual | |
| 10 | page (any page can be on the freelist when we run low), don't mark the | |
| 11 | page in any permanent way - just pass along the information to the | |
| 12 | allocatee. | |
| 13 | ||
| 14 | Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> | |
| 15 | Acked-by: Neil Brown <neilb@suse.de> | |
| 16 | Acked-by: Suresh Jayaraman <sjayaraman@suse.de> | |
| 17 | ||
| 18 | --- | |
| 19 | include/linux/mm_types.h | 1 + | |
| 20 | mm/page_alloc.c | 4 +++- | |
| 21 | 2 files changed, 4 insertions(+), 1 deletion(-) | |
| 22 | ||
| 23 | --- a/include/linux/mm_types.h | |
| 24 | +++ b/include/linux/mm_types.h | |
| 25 | @@ -74,6 +74,7 @@ struct page { | |
| 26 | union { | |
| 27 | pgoff_t index; /* Our offset within mapping. */ | |
| 28 | void *freelist; /* SLUB: freelist req. slab lock */ | |
| 29 | + int reserve; /* page_alloc: page is a reserve page */ | |
| 30 | }; | |
| 31 | struct list_head lru; /* Pageout list, eg. active_list | |
| 32 | * protected by zone->lru_lock ! | |
| 33 | --- a/mm/page_alloc.c | |
| 34 | +++ b/mm/page_alloc.c | |
| 35 | @@ -1425,8 +1425,10 @@ zonelist_scan: | |
| 36 | } | |
| 37 | ||
| 38 | page = buffered_rmqueue(preferred_zone, zone, order, gfp_mask); | |
| 39 | - if (page) | |
| 40 | + if (page) { | |
| 41 | + page->reserve = !!(alloc_flags & ALLOC_NO_WATERMARKS); | |
| 42 | break; | |
| 43 | + } | |
| 44 | this_zone_full: | |
| 45 | if (NUMA_BUILD) | |
| 46 | zlc_mark_zone_full(zonelist, z); |