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| 56 | >Chapter 3. Using LTTV graphical interface</TD |
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| 72 | CLASS="sect1" |
| 73 | ><H1 |
| 74 | CLASS="sect1" |
| 75 | ><A |
| 76 | NAME="ControlFlowColors" |
| 77 | >3.2. Control Flow View Colors</A |
| 78 | ></H1 |
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| 80 | CLASS="mediaobject" |
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| 82 | ><IMG |
| 83 | SRC="lttv-color-list.png" |
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| 86 | ><P |
| 87 | >Control Flow View Color Legend</P |
| 88 | ></DIV |
| 89 | ></P |
| 90 | ></DIV |
| 91 | ><P |
| 92 | > 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 | > 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 | > 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 | > 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 | > 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 | > 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 | > 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 | > 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 | > 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 | > 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 | > 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 | > 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 |
| 177 | ></LI |
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