upstream/mercurial-mirror Files · hgext/inotify/linux/__init__.py

bdiff: gradually enable the popularity hack...

bdiff: gradually enable the popularity hack Patch from Jason Orendorff The lower the threshold, the stronger the popularity hack's influence. So at 3999 lines, the hack is disabled; and at 4000 lines, the hack is enabled at maximum strength (t=4). No source file in mercurial/crew is over 4000 lines. But there are, oh, a few such files in Mozilla. I can testify that this hack causes hg to generate some correct but eyebrow-raising patches. I think the hack should phase in gradually. The threshold should be high for small files where we don't need it so much. Like this: t = (bn < 31000) ? 1000000 / bn : bn / 1000; That would leave the popularity hack disabled for small files, then gradually phase it in: bn < 1000 -- t > bn (popularity hack is completely disabled) bn == 1000 -- t = 1000 (still effectively disabled) bn == 2000 -- t = 500 (only hits unusual files) bn == 10000 -- t = 100 (only hits especially common lines) bn == 31000 -- t = 31 (hack is at maximum power) bn == 32000 -- t = 32 (hack could backfire, ease off)

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      # __init__.py - low-level interfaces to the Linux inotify subsystem

      # Copyright 2006 Bryan O'Sullivan <bos@serpentine.com>

      # This library is free software; you can redistribute it and/or modify

      # it under the terms of version 2.1 of the GNU Lesser General Public

      # License, incorporated herein by reference.

      '''Low-level interface to the Linux inotify subsystem.

      The inotify subsystem provides an efficient mechanism for file status

      monitoring and change notification.

      This package provides the low-level inotify system call interface and

      associated constants and helper functions.

      For a higher-level interface that remains highly efficient, use the

      inotify.watcher package.'''

      __author__ = "Bryan O'Sullivan <bos@serpentine.com>"

      from _inotify import *

      procfs_path = '/proc/sys/fs/inotify'

      def _read_procfs_value(name):

          def read_value():

              try:

                  return int(open(procfs_path + '/' + name).read())

              except OSError:

                  return None

          read_value.__doc__ = '''Return the value of the %s setting from /proc.

          If inotify is not enabled on this system, return None.''' % name

          return read_value

      max_queued_events = _read_procfs_value('max_queued_events')

      max_user_instances = _read_procfs_value('max_user_instances')

      max_user_watches = _read_procfs_value('max_user_watches')

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				# __init__.py - low-level interfaces to the Linux inotify subsystem

				# Copyright 2006 Bryan O'Sullivan <bos@serpentine.com>

				# This library is free software; you can redistribute it and/or modify
				# it under the terms of version 2.1 of the GNU Lesser General Public
				# License, incorporated herein by reference.

				'''Low-level interface to the Linux inotify subsystem.

				The inotify subsystem provides an efficient mechanism for file status
				monitoring and change notification.

				This package provides the low-level inotify system call interface and
				associated constants and helper functions.

				For a higher-level interface that remains highly efficient, use the
				inotify.watcher package.'''

				__author__ = "Bryan O'Sullivan <bos@serpentine.com>"

				from _inotify import *

				procfs_path = '/proc/sys/fs/inotify'

				def _read_procfs_value(name):
				def read_value():
				try:
				return int(open(procfs_path + '/' + name).read())
				except OSError:
				return None

				read_value.__doc__ = '''Return the value of the %s setting from /proc.

				If inotify is not enabled on this system, return None.''' % name

				return read_value

				max_queued_events = _read_procfs_value('max_queued_events')
				max_user_instances = _read_procfs_value('max_user_instances')
				max_user_watches = _read_procfs_value('max_user_watches')