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| -rw-r--r-- | man2/mlock.2 | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/man2/mlock.2 b/man2/mlock.2 index e34bb3b4e0..27f80f6664 100644 --- a/man2/mlock.2 +++ b/man2/mlock.2 @@ -350,6 +350,20 @@ settings are not inherited by a child created via and are cleared during an .BR execve (2). +Note that +.BR fork (2) +will prepare the address space for a copy-on-write operation. The consequence +is that any write access that follows will cause a page fault which in turn may +cause high latencies for a real-time process. Therefore it is crucial not to +invoke +.BR fork (2) +after the +.BR mlockall () +or +.BR mlock () +operation not even from thread which runs at a low priority within a process +which also has a thread running at elevated priority. + The memory lock on an address range is automatically removed if the address range is unmapped via .BR munmap (2). |