Staging: android: lowmemorykiller: Don't count free space unless it meets the specified limit by itself

From: Arve Hjønnevåg <arve@android.com>

This allows processes to be killed when the kernel evict cache pages in
an attempt to get more contiguous free memory.

Signed-off-by: Arve Hjønnevåg <arve@android.com>
Cc: David Rientjes <rientjes@google.com>
Cc: San Mehat <san@android.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 9 insertions, 4 deletions

diff --git a/drivers/staging/android/lowmemorykiller.c b/drivers/staging/android/lowmemorykiller.c
index b9a2e843e2f..b2ab7faac4f 100644
--- a/drivers/staging/android/lowmemorykiller.c
+++ b/drivers/staging/android/lowmemorykiller.c
@@ -58,20 +58,25 @@ static int lowmem_shrink(int nr_to_scan, gfp_t gfp_mask)
         int min_adj = OOM_ADJUST_MAX + 1;
         int selected_tasksize = 0;
         int array_size = ARRAY_SIZE(lowmem_adj);
-        int other_free = global_page_state(NR_FREE_PAGES) + global_page_state(NR_FILE_PAGES);
+        int other_free = global_page_state(NR_FREE_PAGES);
+        int other_file = global_page_state(NR_FILE_PAGES);
         if(lowmem_adj_size < array_size)
                 array_size = lowmem_adj_size;
         if(lowmem_minfree_size < array_size)
                 array_size = lowmem_minfree_size;
         for(i = 0; i < array_size; i++) {
-                if(other_free < lowmem_minfree[i]) {
+                if (other_free < lowmem_minfree[i] &&
+                    other_file < lowmem_minfree[i]) {
                         min_adj = lowmem_adj[i];
                         break;
                 }
         }
         if(nr_to_scan > 0)
-                lowmem_print(3, "lowmem_shrink %d, %x, ofree %d, ma %d\n", nr_to_scan, gfp_mask, other_free, min_adj);
-        rem = global_page_state(NR_ACTIVE) + global_page_state(NR_INACTIVE);
+                lowmem_print(3, "lowmem_shrink %d, %x, ofree %d %d, ma %d\n", nr_to_scan, gfp_mask, other_free, other_file, min_adj);
+        rem = global_page_state(NR_ACTIVE_ANON) +
+                global_page_state(NR_ACTIVE_FILE) +
+                global_page_state(NR_INACTIVE_ANON) +
+                global_page_state(NR_INACTIVE_FILE);
         if (nr_to_scan <= 0 || min_adj == OOM_ADJUST_MAX + 1) {
                 lowmem_print(5, "lowmem_shrink %d, %x, return %d\n", nr_to_scan, gfp_mask, rem);
                 return rem;