ring-buffer: record page entries in buffer page descriptor

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Currently, when the ring buffer writer overflows the buffer and must
write over non consumed data, we increment the overrun counter by
reading the entries on the page we are about to overwrite. This reads
the entries one by one.

This is not very effecient. This patch adds another entry counter
into each buffer page descriptor that keeps track of the number of
entries on the page. Now on overwrite, the overrun counter simply
needs to add the number of entries that is on the page it is about
to overwrite.

[ Impact: speed up of ring buffer in overwrite mode ]

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

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Steven Rostedt 2009-05-01 18:44:45 -04:00 • committed by Steven Rostedt

parent e4906eff9e

commit 778c55d44e

1 changed files with 13 additions and 26 deletions

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39

kernel/trace/ring_buffer.c

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