i change code xc_save.c as follows:

 int 
 main(int argc, char **argv) 
 { 
-    unsigned int maxit, max_f; 
+    unsigned int maxit, max_f, lflags; 
     int io_fd, ret, port; 
     struct save_callbacks callbacks; 
+    xentoollog_level lvl; 
+    xentoollog_logger *l; 
  
     if (argc != 6) 
         errx(1, "usage: %s iofd domid maxit maxf flags", argv[0]); 
  
-    si.xch = xc_interface_open(0,0,0); 
-    if (!si.xch) 
-        errx(1, "failed to open control interface"); 
- 
     io_fd = atoi(argv[1]); 
     si.domid = atoi(argv[2]); 
     maxit = atoi(argv[3]); 
@@ -185,6 +183,13 @@ main(int argc, char **argv) 
  
     si.suspend_evtchn = -1; 
  
+    lvl = si.flags & XCFLAGS_DEBUG ? XTL_DEBUG: XTL_DETAIL; 
+    lflags = XTL_STDIOSTREAM_HIDE_PROGRESS; 
+    l = (xentoollog_logger *)xtl_createlogger_stdiostream(stderr, lvl, lflags); 
+    si.xch = xc_interface_open(l, 0, 0); 
+    if (!si.xch) 
+        errx(1, "failed to open control interface"); 
+ 
     si.xce = xc_evtchn_open(NULL, 0); 
     if (si.xce == NULL) 
         warnx("failed to open event channel handle"); 


==============================================================
in this code change lflags to  lflags = XTL_STDIOSTREAM_HIDE_PROGRESS; and i don't know what mean's @@ -185,6 +183,13 @@ main(int argc, char **argv)    ?!!

 so i delete @@ -185,6 +183,13 @@ main(int argc, char **argv) from code and test logger (to live migration of  VM) But again result output in xend.log don't change.
 
 
Adel Amani
M.Sc. Candidate@Computer Engineering Department, University of Isfahan
Email: A.Amani@eng.ui.ac.ir



On Wednesday, February 19, 2014 5:42 PM, Olaf Hering <olaf@aepfle.de> wrote:
 
On Tue, Feb 18, Adel Amani wrote:

> Hi
> i know because a lot of product output in xen-4.1, no logger in xc_save.c
> i change code again according to "http://xen.1045712.n5.nabble.com/
> xen-unstable-tools-xc-restore-logging-in-xc-save-td5714324.html"
> But i don't know purpose Mr "patchbot" of 
> @@ -185,6 +183,13 @@ main(int argc, char **argv)
> i test again to code Mr "patchbot" without Consideration 
> @@ -185,6 +183,13 @@ main(int argc, char **argv)
> and result again no message :-( ....


All that is very imprecise, so we can not help.
Also read what I wrote: dont drop xen-devel@lists.xen.org

Olaf




> On Saturday, February 8, 2014 1:52 AM, Olaf Hering <olaf@aepfle.de> wrote:
> Please keep xen-devel@lists.xen.org in CC list.
> 
> On Fri, Feb 07, Adel Amani wrote:
> 
> > yes, for print data, function print_stats() in xc_domain_save.c should run
> and
> > work. I read in function and check.... But i don't know really why this don't
> > work!!! :-|... I test 'fprintf(stderr,"STDERR\n"); fprintf(stdout,"STDOUT\
> n");'
> > But again not answer :'(.....
> 
> Please make sure the self-compiled binary is actually used. Try this to
> verify: grep STDERR /usr/lib/xen/bin/xc_save (assuming the fprintf above
> is actually in the compiled code.)
> 
> > how boot the domU with 'initcall_debug'?! Are affect on total time?!
> 
> This is a kernel cmdline option. Please check the documentation about
> how to pass additional kernel parameters to a domU.
> 
> 
> Olaf
> 
>