| commit | 4804e382c117ce213cd5c43512cf4b1d71bb2650 | [log] [tgz] |
|---|---|---|
| author | Thomas Gleixner <tglx@linutronix.de> | Mon Nov 11 23:03:25 2019 +0100 |
| committer | Thomas Gleixner <tglx@linutronix.de> | Sat Nov 16 11:24:04 2019 +0100 |
| tree | a655461687013c631b6799b65d57943ea7840981 | |
| parent | ea5f1cd7ab494f65f50f338299eabb40ad6a1767 [diff] |
x86/ioperm: Share I/O bitmap if identical The I/O bitmap is duplicated on fork. That's wasting memory and slows down fork. There is no point to do so. As long as the bitmap is not modified it can be shared between threads and processes. Add a refcount and just share it on fork. If a task modifies the bitmap then it has to do the duplication if and only if it is shared. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Andy Lutomirski <luto@kernel.org>