[Tracker] tracker-applet and accessing icon file

[Michal Pryc <Michal Pryc Sun COM>]

Hello,
Today I saw some strange behavior and I digg into it and here are the 
results.

So what is the problem?

The tracker-applet is accessing way too many times the three image 
files, during indexing (icon changes every second).

Here is the dtrace script showing which file is accessed how many times 
during 60s. We can see that it's 20, so 20*3=60s, which gives us way to 
many times. The image should be in memory in such case.


# dtrace -n 'syscall::open*:entry /execname == "tracker-applet"/{ 
@[copyinstr(arg0)]=count(); } tick-60s{exit(0);}'
dtrace: description 'syscall::open*:entry ' matched 3 probes
CPU     ID                    FUNCTION:NAME
  0   1224                        :tick-60s

  /usr/share/tracker/icons/tracker-applet-default.png               20
  /usr/share/tracker/icons/tracker-applet-indexing1.png               20
  /usr/share/tracker/icons/tracker-applet-indexing2.png               20



Here we can see the real user stack for this operation:


# dtrace -n 'syscall::open*:entry /execname == "tracker-applet"/{ 
@[ustack()]=count(); } tick-10s{exit(0);}'
dtrace: description 'syscall::open*:entry ' matched 3 probes
CPU     ID                    FUNCTION:NAME
  0   1223                        :tick-10s


              libc.so.1`__open64+0x15
              libc.so.1`_endopen+0xb8
              libc.so.1`fopen64+0x29
              libgdk_pixbuf-2.0.so.0.1000.12`gdk_pixbuf_new_from_file+0x7d

libgtk-x11-2.0.so.0.1000.12`gtk_status_icon_set_from_file+0x3a
              tracker-applet`set_tracker_icon+0x4f
              tracker-applet`set_icon+0x9d
              libglib-2.0.so.0.1200.12`g_timeout_dispatch+0x24
              libglib-2.0.so.0.1200.12`g_main_dispatch+0x1d9
              libglib-2.0.so.0.1200.12`g_main_context_dispatch+0x85
              libglib-2.0.so.0.1200.12`g_main_context_iterate+0x3ce
              libglib-2.0.so.0.1200.12`g_main_loop_run+0x1b8
              libgtk-x11-2.0.so.0.1000.12`gtk_main+0xb2
              tracker-applet`main+0x31e
              tracker-applet`_start+0x7d
               10


--
best
Michal Pryc