Method sections

Lib/test/support/strace_helper.py:52–72

Find all "MARK " writes and use them to make groups of events. This is useful to avoid variable / overhead events, like those at interpreter startup or when opening a file so a test can verify just the small case under study.

(self)

        ]

    def sections(self):
        """Find all "MARK <X>" writes and use them to make groups of events.

        This is useful to avoid variable / overhead events, like those at
        interpreter startup or when opening a file so a test can verify just
        the small case under study."""
        current_section = "__startup"
        sections = {current_section: []}
        for event in self.events():
            if event.syscall == 'write' and len(
                    event.args) > 2 and event.args[1].startswith("\"MARK "):
                # Found a new section, don't include the write in the section
                # but all events until next mark should be in that section
                current_section = event.args[1].split(
                    " ", 1)[1].removesuffix('\\n"')
                if current_section not in sections:
                    sections[current_section] = list()
            else:
                sections[current_section].append(event)

        return sections

def _filter_memory_call(call):
    # mmap can operate on a fd or "MAP_ANONYMOUS" which gives a block of memory.