trace-cmd library: Add logic for in-memory decompression
There are two approaches to read compressed trace data:
- use a temporary file to decompress entire trace data before reading
- use in-memory decompression of requested trace data chunk only
In-memory decompression seems to be more efficient, but selecting which
approach to use depends in the use case.
A compression chunk consists of multiple trace pages, that's why a small
cache with uncompressed chunks is implemented. The chunk stays in the
cache until there are pages which have reference to it.
Link: https://lore.kernel.org/linux-trace-devel/20220126094906.570451-15-tz.stoyanov@gmail.com
Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
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