You mean read_lock(&files->file_lock); :)
Dave, does your webserver benchmark clone() tasks with CLONE_FILES ? Unless
the fd table is shared, can't see why there would be contention on this.
If it is indeed necessary to share fd table, then there is a somewhat
unmaintained lockfree fget() patch (files_struct_rcu) that you might want
> On Wed, Jan 15, 2003 at 08:18:13PM -0800, Dave Hansen wrote:
> > time:_raw_write_lock() 1350000
> > Call Trace:
> > [<c010f321>] timer_interrupt+0x99/0x9c
> > [<c010b150>] handle_IRQ_event+0x38/0x5c
> read_lock_irqsave(&xtime_lock, flags)
ISTR a patch from Stephen Hemminger at OSDL that used Andrea's
sequence number trick based rwlock (frlock) to implement do_gettimeofday.
It might be relevant here.
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