X-Git-Url: http://git.annexia.org/?p=libguestfs.git;a=blobdiff_plain;f=src%2Fguestfs.pod;fp=src%2Fguestfs.pod;h=ada9f1e53ba15286e02c5e28cdfcba862b7b5b05;hp=1a5abc65f0414aeebb4436de3598c291283acec6;hb=c155330f04f933d13298d5cddab6b7f3dc9d218f;hpb=d6622d7636d592eb1c01fbcb8b8ad52c2b20615b

diff --git a/src/guestfs.pod b/src/guestfs.pod
index 1a5abc6..ada9f1e 100644
--- a/src/guestfs.pod
+++ b/src/guestfs.pod
@@ -2165,6 +2165,77 @@ are being deleted, but other manipulations of keys within the loop
 might not terminate unless you also maintain an indication of which
 keys have been visited.
 
+=head1 SYSTEMTAP
+
+The libguestfs C library can be probed using systemtap or DTrace.
+This is true of any library, not just libguestfs.  However libguestfs
+also contains static markers to help in probing internal operations.
+
+You can list all the static markers by doing:
+
+ stap -l 'process("/usr/lib*/libguestfs.so.0")
+              .provider("guestfs").mark("*")'
+
+B<Note:> These static markers are I<not> part of the stable API and
+may change in future versions.
+
+=head2 SYSTEMTAP SCRIPT EXAMPLE
+
+This script contains examples of displaying both the static markers
+and some ordinary C entry points:
+
+ global last;
+ 
+ function display_time () {
+       now = gettimeofday_us ();
+       delta = 0;
+       if (last > 0)
+             delta = now - last;
+       last = now;
+ 
+       printf ("%d (+%d):", now, delta);
+ }
+ 
+ probe begin {
+       last = 0;
+       printf ("ready\n");
+ }
+ 
+ /* Display all calls to static markers. */
+ probe process("/usr/lib*/libguestfs.so.0")
+           .provider("guestfs").mark("*") ? {
+       display_time();
+       printf ("\t%s %s\n", $$name, $$parms);
+ }
+ 
+ /* Display all calls to guestfs_mkfs* functions. */
+ probe process("/usr/lib*/libguestfs.so.0")
+           .function("guestfs_mkfs*") ? {
+       display_time();
+       printf ("\t%s %s\n", probefunc(), $$parms);
+ }
+
+The script above can be saved to C<test.stap> and run using the
+L<stap(1)> program.  Note that you either have to be root, or you have
+to add yourself to several special stap groups.  Consult the systemtap
+documentation for more information.
+
+ # stap /tmp/test.stap
+ ready
+
+In another terminal, run a guestfish command such as this:
+
+ guestfish -N fs
+
+In the first terminal, stap trace output similar to this is shown:
+
+ 1318248056692655 (+0):	launch_start
+ 1318248056692850 (+195):       launch_build_appliance_start
+ 1318248056818285 (+125435):    launch_build_appliance_end
+ 1318248056838059 (+19774):     launch_run_qemu
+ 1318248061071167 (+4233108):   launch_end
+ 1318248061280324 (+209157):    guestfs_mkfs g=0x1024ab0 fstype=0x46116f device=0x1024e60
+
 =begin html
 
 <!-- old anchor for the next section -->
@@ -3216,6 +3287,7 @@ L<qemu(1)>,
 L<febootstrap(1)>,
 L<febootstrap-supermin-helper(8)>,
 L<hivex(3)>,
+L<stap(1)>,
 L<http://libguestfs.org/>.
 
 Tools with a similar purpose: