[oprof-cvs] CVS: oprofile/doc oprofile.xml,1.49,1.50

[John L. <mov...@us...>]

Update of /cvsroot/oprofile/oprofile/doc
In directory sc8-pr-cvs1:/tmp/cvs-serv27175/doc

Modified Files:
	oprofile.xml 
Log Message:
small fixes



Index: oprofile.xml
===================================================================
RCS file: /cvsroot/oprofile/oprofile/doc/oprofile.xml,v
retrieving revision 1.49
retrieving revision 1.50
diff -u -d -r1.49 -r1.50
--- oprofile.xml	27 Feb 2003 20:23:33 -0000	1.49
+++ oprofile.xml	1 Mar 2003 14:20:07 -0000	1.50
@@ -33,6 +33,13 @@
 to binaries. It runs transparently in the background collecting information at a low overhead. These
 features make it ideal for profiling entire systems to determine bottle necks in real-world systems.
 </para>
+<para>
+Many CPUs provide "performance counters", hardware registers that can count "events"; for example,
+cache misses, or CPU cycles. OProfile provides access to these counters, so they may be used to
+provide profiles of code based on the number of these occurring events. Some hardware setups do
+not allow OProfile to use performance counters: in these cases, no events are available, and
+OProfile operates in timer/RTC mode, as described in later chapters.
+</para>
 
 <sect1 id="requirements">
 <title>System requirements</title>
@@ -218,6 +225,10 @@
 2.5 kernels or higher, you do not need kernel source, as long as the
 OProfile driver is enabled; additionally, you should not need to disable
 power management.
+</para>
+<para>
+Please note that you must save or have available the <filename>vmlinux</filename> file
+generated during a kernel compile, as OProfile needs it.
 </para>
 
 </sect1>