Split the LRU lists in two, one set for pages that are backed by real file systems ("file") and one for pages that are backed by memory and swap ("anon"). The latter includes tmpfs. The advantage of doing this is that the VM will not have to scan over lots of anonymous pages (which we generally do not want to swap out), just to find the page cache pages that it should evict. This patch has the infrastructure and a basic policy to balance how much we scan the anon lists and how much we scan the file lists. The big policy changes are in separate patches. [lee.schermerhorn@hp.com: collect lru meminfo statistics from correct offset] [kosaki.motohiro@jp.fujitsu.com: prevent incorrect oom under split_lru] [kosaki.motohiro@jp.fujitsu.com: fix pagevec_move_tail() doesn't treat unevictable page] [hugh@veritas.com: memcg swapbacked pages active] [hugh@veritas.com: splitlru: BDI_CAP_SWAP_BACKED] [akpm@linux-foundation.org: fix /proc/vmstat units] [nishimura@mxp.nes.nec.co.jp: memcg: fix handling of shmem migration] [kosaki.motohiro@jp.fujitsu.com: adjust Quicklists field of /proc/meminfo] [kosaki.motohiro@jp.fujitsu.com: fix style issue of get_scan_ratio()] Signed-off-by: Rik van Riel <riel@redhat.com> Signed-off-by: Lee Schermerhorn <Lee.Schermerhorn@hp.com> Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Hugh Dickins <hugh@veritas.com> Signed-off-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Showing the changes to include/linux/backing-dev.h (1 of 25 files). Show all
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| @@ -175,6 +175,8 @@ int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ratio); · 174 unmodified lines | ||
| 175 | 175 | * BDI_CAP_READ_MAP: Can be mapped for reading |
| 176 | 176 | * BDI_CAP_WRITE_MAP: Can be mapped for writing |
| 177 | 177 | * BDI_CAP_EXEC_MAP: Can be mapped for execution |
| 178 | + * | |
| 179 | + * BDI_CAP_SWAP_BACKED: Count shmem/tmpfs objects as swap-backed. | |
| 178 | 180 | */ |
| 179 | 181 | #define BDI_CAP_NO_ACCT_DIRTY 0x00000001 |
| 180 | 182 | #define BDI_CAP_NO_WRITEBACK 0x00000002 |
| @@ -184,6 +186,7 @@ int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ratio); · 3 unmodified lines | ||
| 184 | 186 | #define BDI_CAP_WRITE_MAP 0x00000020 |
| 185 | 187 | #define BDI_CAP_EXEC_MAP 0x00000040 |
| 186 | 188 | #define BDI_CAP_NO_ACCT_WB 0x00000080 |
| 189 | +#define BDI_CAP_SWAP_BACKED 0x00000100 | |
| 187 | 190 | |
| 188 | 191 | #define BDI_CAP_VMFLAGS \ |
| 189 | 192 | (BDI_CAP_READ_MAP | BDI_CAP_WRITE_MAP | BDI_CAP_EXEC_MAP) |
| @@ -248,6 +251,11 @@ static inline bool bdi_cap_account_writeback(struct backing_dev_info *bdi) · 58 unmodified lines | ||
| 248 | 251 | BDI_CAP_NO_WRITEBACK)); |
| 249 | 252 | } |
| 250 | 253 | |
| 254 | +static inline bool bdi_cap_swap_backed(struct backing_dev_info *bdi) | |
| 255 | +{ | |
| 256 | + return bdi->capabilities & BDI_CAP_SWAP_BACKED; | |
| 257 | +} | |
| 258 | + | |
| 251 | 259 | static inline bool mapping_cap_writeback_dirty(struct address_space *mapping) |
| 252 | 260 | { |
| 253 | 261 | return bdi_cap_writeback_dirty(mapping->backing_dev_info); |
| @@ -258,4 +266,9 @@ static inline bool mapping_cap_account_dirty(struct address_space *mapping) · 4 unmodified lines | ||
| 258 | 266 | return bdi_cap_account_dirty(mapping->backing_dev_info); |
| 259 | 267 | } |
| 260 | 268 | |
| 269 | +static inline bool mapping_cap_swap_backed(struct address_space *mapping) | |
| 270 | +{ | |
| 271 | + return bdi_cap_swap_backed(mapping->backing_dev_info); | |
| 272 | +} | |
| 273 | + | |
| 261 | 274 | #endif /* _LINUX_BACKING_DEV_H */ |