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ftrace: Separate top_buffer_size from buffer_size

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Since we now set the top buffer size to be the same as the devlib buffer
size, this effectively halves the maximum available buffer size that can
be set while using devlib. Whatever size is passed as `buffer_size` will
be allocated twice, even if the top buffer is hardly used at all.

This commit separates them into `buffer_size` and `top_buffer_size`. If
the latter is not passed, the behaviour will not change compared to now.

Fixes: e0c53d09990b5501e493d048a5dce067d8990281
Signed-off-by: Kajetan Puchalski <kajetan.puchalski@arm.com>
This commit is contained in:
Kajetan Puchalski 2023-08-14 16:47:05 +01:00 committed by Marc Bonnici
parent 1730f69461
commit 6b09571859
1 changed files with 5 additions and 2 deletions
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7
devlib/collector/ftrace.py
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@ -60,6 +60,7 @@ class FtraceCollector(CollectorBase):
tracer=None,
trace_children_functions=False,
buffer_size=None,
top_buffer_size=None,
buffer_size_step=1000,
tracing_path=None,
automark=True,
@ -77,6 +78,7 @@ class FtraceCollector(CollectorBase):
self.tracer = tracer
self.trace_children_functions = trace_children_functions
self.buffer_size = buffer_size
self.top_buffer_size = top_buffer_size
self.tracing_path = self._resolve_tracing_path(target, tracing_path)
self.automark = automark
self.autoreport = autoreport
@ -245,10 +247,11 @@ class FtraceCollector(CollectorBase):
# parameter, but unfortunately some events still end up there (e.g.
# print event). So we still need to set that size, otherwise the buffer
# might be too small and some event lost.
if self.buffer_size is not None:
top_buffer_size = self.top_buffer_size if self.top_buffer_size else self.buffer_size
if top_buffer_size:
self.target.write_value(
self.target.path.join(self.tracing_path, 'buffer_size_kb'),
self.buffer_size
top_buffer_size,
)
if self.functions: