[Xen-devel] [PATCH 2/2] reap the blktapctl thread and notify the tapdisk backend driver to release resource like memory..

["James Song" <jsong@xxxxxxxxxx>]

Hi,

 

For this issue I had initial discussion thread before, more detail, please see :
http://lists.xensource.com/archives/html/xen-devel/2010-04/msg01140.html.

 

I write a new patch for this issue, which modified qemu code.  So Ian, could you take a look this patch,too.

 

thanks,

-James (Song Wei)

 

Signed-off-by: James ( Song Wei ) <jsong@xxxxxxxxxx>

 

diff -r 2cc9ec0cf061 i386-dm/helper2.c
--- a/i386-dm/helper2.c Fri Apr 30 17:41:45 2010 +0100
+++ b/i386-dm/helper2.c Wed May 05 10:57:33 2010 +0800
@@ -550,12 +550,27 @@
 
 int xen_pause_requested;
 
+int finish_work_shutdown(int timeout)
+{
+    extern int shutdown_requested;
+    extern int connected_disks;
+    if (shutdown_requested){
+        while(connected_disks > 0 &&  timeout > 0){
+            main_loop_wait(1);
+            timeout--;
+        }
+    }
+    raise(SIGKILL);
+    return 1;
+}
+   
 int main_loop(void)
 {
     CPUState *env = cpu_single_env;
     int evtchn_fd = xce_handle == -1 ? -1 : xc_evtchn_fd(xce_handle);
     char *qemu_file;
     fd_set fds;
+    extern int shutdown_requested;
 
     main_loop_prepare();
 
@@ -571,9 +586,12 @@
     qemu_set_fd_handler(xenstore_fd(), xenstore_process_event, NULL, NULL);
 
     while (1) {
-        while (!(vm_running && xen_pause_requested))
+        while (!(vm_running && xen_pause_requested)){
+            if (shutdown_requested)
+                finish_work_shutdown(2000); //timeout 5s
             /* Wait up to 10 msec. */
             main_loop_wait(10);
+       }
 
         fprintf(logfile, "device model saving state\n");
 
@@ -595,6 +613,9 @@
             FD_SET(xenstore_fd(), &fds);
             if (select(xenstore_fd() + 1, &fds, NULL, NULL, NULL) > 0)
                 xenstore_process_event(NULL);
+            if (shutdown_requested)
+                finish_work_shutdown(2000);
+
         }
 
         xenstore_record_dm_state("running");
diff -r 2cc9ec0cf061 vl.c
--- a/vl.c Fri Apr 30 17:41:45 2010 +0100
+++ b/vl.c Wed May 05 10:57:33 2010 +0800
@@ -3614,7 +3614,7 @@
 
 static QEMUResetEntry *first_reset_entry;
 static int reset_requested;
-static int shutdown_requested;
+int shutdown_requested;
 static int powerdown_requested;
 
 int qemu_shutdown_requested(void)
@@ -4699,9 +4699,11 @@
 
     memset(&act, 0, sizeof(act));
     act.sa_handler = termsig_handler;
+#ifndef CONFIG_DM
     sigaction(SIGINT,  &act, NULL);
+    sigaction(SIGTERM, &act, NULL);
+#endif
     sigaction(SIGHUP,  &act, NULL);
-    sigaction(SIGTERM, &act, NULL);
 }
 
 #endif
@@ -5851,11 +5853,9 @@
     register_savevm_live("ram", 0, 3, ram_save_live, NULL, ram_load, NULL);
 
 #ifndef _WIN32
-#ifndef CONFIG_DM
     /* must be after terminal init, SDL library changes signal handlers */
     termsig_setup();
 #endif
-#endif
 
     /* Maintain compatibility with multiple stdio monitors */
     if (!strcmp(monitor_device,"stdio")) {

 

 

 

 

wait_for_tapdisk_close.diff
Description: Text document

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