tags/lttv-0.10.0-pre15-12082008/doc/user/user_guide/html/x81.html

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  56 >Chapter 3. Using LTTV graphical interface</TD
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  75 ><A
  76 NAME="ControlFlowColors"
  77 >3.2. Control Flow View Colors</A
  78 ></H1
  79 ><DIV
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  81 ><P
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  83 SRC="lttv-color-list.png"
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  87 >Control Flow View Color Legend</P
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  91 ><P
  92 >&#13;Here is a description of the colors used in the control flow view. Each color
  93 represents a state of the process at a given time.
  94 </P
  95 ><P
  96 ></P
  97 ><UL
  98 ><LI
  99 ><P
 100 >&#13;White : this color is used for process from which state is not known. It may
 101 happen when you seek quickly at a far time in the trace just after it has been
 102 launched. At that moment, the precomputed state information is incomplete. The
 103 "unknown" state is used to identify this. Note that the viewer gets refreshed
 104 once the precomputation ends.
 105 </P
 106 ></LI
 107 ><LI
 108 ><P
 109 >&#13;Green : This color is only used for process when they are running in user mode.
 110 That includes execution of all the source code of an executable as well as the
 111 libraries it uses.
 112 </P
 113 ></LI
 114 ><LI
 115 ><P
 116 >&#13;Pale blue : A process is doing a system call to the kernel, and the mode is
 117 switched from process limited rights to super user mode. Only code from the
 118 kernel (including modules) should be run in that state.
 119 </P
 120 ></LI
 121 ><LI
 122 ><P
 123 >&#13;Yellow : The kernel is running a trap that services a fault. The most frequent
 124 trap is the memory page fault trap : it is called every time a page is missing
 125 from physical memory.
 126 </P
 127 ></LI
 128 ><LI
 129 ><P
 130 >&#13;Orange : IRQ servicing routine is running. It interrupts the currently running
 131 process. As the IRQ does not change the currently running process (on some
 132 architectures it uses the same stack as the process), the IRQ state is shown in
 133 the state of the process. IRQ can be nested : a higher priority interrupt can
 134 interrupt a lower priority interrupt.
 135 </P
 136 ></LI
 137 ><LI
 138 ><P
 139 >&#13;Pink : SoftIRQ handler is running. A SoftIRQ is normally triggered by an
 140 interrupt that whishes to have some work done very soon, but not "now". This is
 141 especially useful, for example, to have the longest part of the network stack
 142 traversal done : a too long computation in the interrupt handler would increase
 143 the latency of the system. Therefore, doing the long part of the computation in
 144 a softirq that will be run just after the IRQ handler exits will permits to do
 145 this work while interrupts are enabled, without increasing the system latency.
 146 </P
 147 ></LI
 148 ><LI
 149 ><P
 150 >&#13;Dark red : A process in that state is waiting for an input/output operation to
 151 complete before it can continue its execution.
 152 </P
 153 ></LI
 154 ><LI
 155 ><P
 156 >&#13;Dark yellow : A process is ready to run, but waiting to get the CPU (a schedule
 157 in event).
 158 </P
 159 ></LI
 160 ><LI
 161 ><P
 162 >&#13;Dark purple : A process in zombie state. This state happens when a process
 163 exits and then waits for the parent to wait for it (wait() or waitpid()).
 164 </P
 165 ></LI
 166 ><LI
 167 ><P
 168 >&#13;Dark green : A process has just been created by its parent and is waiting for
 169 first scheduling.
 170 </P
 171 ></LI
 172 ><LI
 173 ><P
 174 >&#13;Magenta : The process has exited, but still has the control of the CPU. It may
 175 happend if it has some tasks to do in the exit system call.
 176 </P
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