xnu-3789.51.2.tar.gz

[apple/xnu.git] / osfmk / vm / vm_compressor.c

diff --git a/osfmk/vm/vm_compressor.c b/osfmk/vm/vm_compressor.c
index ac885bbd90879609eba3d6daeea03b3d82fe394c..b62fd6840515a425516d7d170e179cf98aeb8393 100644 (file)
--- a/osfmk/vm/vm_compressor.c
+++ b/osfmk/vm/vm_compressor.c
@@ -329,6 +329,11 @@ vm_wants_task_throttled(task_t task)
 }
 
 
+#if DEVELOPMENT || DEBUG
+boolean_t kill_on_no_paging_space = FALSE; /* On compressor/swap exhaustion, kill the largest process regardless of
+                                           * its chosen process policy. Controlled by a boot-arg of the same name. */
+#endif /* DEVELOPMENT || DEBUG */
+
 
 static uint32_t        no_paging_space_action_in_progress = 0;
 extern void memorystatus_send_low_swap_note(void);
@@ -341,6 +346,17 @@ vm_compressor_take_paging_space_action(void)
                if (OSCompareAndSwap(0, 1, (UInt32 *)&no_paging_space_action_in_progress)) {
 
                        if (no_paging_space_action()) {
+#if DEVELOPMENT || DEBUG
+                               if (kill_on_no_paging_space == TRUE) {
+                                       /*
+                                        * Since we are choosing to always kill a process, we don't need the
+                                        * "out of application memory" dialog box in this mode. And, hence we won't
+                                        * send the knote.
+                                        */
+                                       no_paging_space_action_in_progress = 0;
+                                       return;
+                               }
+#endif /* DEVELOPMENT || DEBUG */
                                memorystatus_send_low_swap_note();
                        }
 
@@ -411,6 +427,13 @@ vm_compressor_init(void)
        vm_size_t       c_compressed_record_sbuf_size = 0;
 #endif /* RECORD_THE_COMPRESSED_DATA */
 
+#if DEVELOPMENT || DEBUG
+       char bootarg_name[32];
+       if (PE_parse_boot_argn("-kill_on_no_paging_space", bootarg_name, sizeof (bootarg_name))) {
+               kill_on_no_paging_space = TRUE;
+       }
+#endif /* DEVELOPMENT || DEBUG */
+
        /*
         * ensure that any pointer that gets created from
         * the vm_page zone can be packed properly