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ramoops: Split ftrace buffer space into per-CPU zones

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If the RAMOOPS_FLAG_FTRACE_PER_CPU flag is passed to ramoops pdata, split
the ftrace space into multiple zones depending on the number of CPUs.

This speeds up the performance of function tracing by about 280% in my
tests as we avoid the locking. The trade off being lesser space available
per CPU. Let the ramoops user decide which option they want based on pdata
flag.

Signed-off-by: Joel Fernandes <joelaf@google.com>
[kees: added max_ftrace_cnt to track size, added DT logic and docs]
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Joel Fernandes
2016-10-20 00:34:04 -07:00
committed by Kees Cook
parent de83209249
commit a1cf53ac6d
3 changed files with 61 additions and 17 deletions
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3
Documentation/devicetree/bindings/reserved-memory/ramoops.txt
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@@ -46,3 +46,6 @@ Optional properties:
(defaults to buffered mappings)
- no-dump-oops: if present, only dump panics (defaults to panics and oops)
- flags: if present, pass ramoops behavioral flags (defaults to 0,
see include/linux/pstore_ram.h RAMOOPS_FLAG_* for flag values).