freezing-of-tasks.rst - OpenGrok cross reference for /linux/Documentation/power/freezing-of-tasks.rst

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2 Freezing of tasks
7 I. What is the freezing of tasks?
10 The freezing of tasks is a mechanism by which user space processes and some
18 and PF_FREEZER_SKIP (the last one is auxiliary).  The tasks that have
30 All freezable tasks must react to that by calling try_to_freeze(), which
62 initiated a freezing operation, the freezing of tasks will fail and the entire
69 order to clear the PF_FROZEN flag for each frozen task.  Then, the tasks that
73 Rationale behind the functions dealing with freezing and thawing of tasks
77   - freezes only userspace tasks
80   - freezes all tasks (including kernel threads) because we can't freeze
81     kernel threads without freezing userspace tasks
86     userspace tasks, or if we want to postpone the thawing of userspace tasks
89   - thaws all tasks (including kernel threads) because we can't thaw userspace
90     tasks without thawing kernel threads
104 Generally speaking, there is a couple of reasons to use the freezing of tasks:
115    tasks that might cause the on-disk filesystems' data and metadata to be
124    Then, after the memory for the image has been freed, we don't want tasks
133    example, be troublesome and without the freezing of tasks we would need some
136 Although Linus Torvalds doesn't like the freezing of tasks, he said this in one
139 "RJW:> Why we freeze tasks at all or why we freeze kernel threads?
160 4. Another reason for freezing tasks is to prevent user space processes from
165    is quite difficult to achieve without the freezing of tasks.  Consider,
171 V. Are there any problems related to the freezing of tasks?
197 There are also problems that the freezing of tasks tends to expose, although
201 at this point.  So, seemingly, the failure is due to the freezing of tasks.
204 request_firmware() will fail regardless of whether or not the freezing of tasks
206 tasks, since it generally exists anyway.