i386 has a fair rwsemaphore, too - probably other archs must be modified
> The fix is a few liner for my
> implementation, here it is:
Obivously your patch fixes the race, but we could starve down_write() if
there are many page faults.
Which multithreaded apps rely on mmap for file io? innd, perhaps samba
if mmap is enabled (I'm not sure what's the default and if samba is
If you compile a kernel for 80386, then i386 uses the generic
Could someone with innd compile his kernel for i386, apply Andrea's
patch and check that the performance doesn't break down?
IMHO modifying proc_pid_read_maps() is far simpler - I'm not aware of
another recursive mmap_sem user.
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