.

bigfile/virtmem.c

@@ -111,7 +111,7 @@ void virt_lock_hookgil(const VirtGilHooks *gilhooks)
     //
     // XXX temp hack to workaround that bug for now.
     if (virtmem_gilhooks == gilhooks)
-	    virtmem_gilhooks = NULL;
+        virtmem_gilhooks = NULL;
 
     BUG_ON(virtmem_gilhooks);       /* prevent registering multiple times */
     virtmem_gilhooks = gilhooks;
@@ -955,8 +955,15 @@ static int __ram_reclaim(RAM *ram)
 
         /* can release ram only from loaded non-dirty pages
          * NOTE PAGE_LOADING pages are not dropped - they just continue to load
-         * NOTE PAGE_LOADED_FOR_WRITE are not dropped - they are going to be dirtied in a moment */
-        if (page->state == PAGE_LOADED) {
+         *
+         * NOTE PAGE_LOADED_FOR_WRITE are dropped too - even if normally they
+         * are going to be dirtied in a moment, due to VM_RETRY logic and so
+         * VMA might be changing simultaneously to pagefault handling, a
+         * page might remain in pagemap in PAGE_LOADED_FOR_WRITE state
+         * indefinitely unused and without actually being dirtied.
+         *
+         * TODO drop PAGE_LOADED_FOR_WRITE only after all PAGE_LOADED have been reclaimed. */
+        if (page->state == PAGE_LOADED || page->state == PAGE_LOADED_FOR_WRITE) {
             page_drop_memory(page);
             batch--;
         }