tracing/user_events: Add ioctl for disabling addresses

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Enablements are now tracked by the lifetime of the task/mm. User
processes need to be able to disable their addresses if tracing is
requested to be turned off. Before unmapping the page would suffice.
However, we now need a stronger contract. Add an ioctl to enable this.

A new flag bit is added, freeing, to user_event_enabler to ensure that
if the event is attempted to be removed while a fault is being handled
that the remove is delayed until after the fault is reattempted.

Link: https://lkml.kernel.org/r/20230328235219.203-6-beaub@linux.microsoft.com

Signed-off-by: Beau Belgrave <beaub@linux.microsoft.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

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Beau Belgrave 2023-03-28 16:52:12 -07:00 • committed by Steven Rostedt (Google)

parent 81f8fb6549

commit dcb8177c13

2 changed files with 119 additions and 2 deletions

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24

include/uapi/linux/user_events.h

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97

kernel/trace/trace_events_user.c

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