Re: RCU scaling on large systems

[Jack Steiner]

On Fri, May 07, 2004 at 01:50:48PM -0700, Paul E. McKenney wrote:
> On Mon, May 03, 2004 at 01:40:06PM -0500, Jack Steiner wrote:
> > Paul - 
> > 
> 
> Hmmm...  I took a quick glance, but don't see why an "ls" would
> cause RCU to be invoked.  This should only happen if a dentry is
> ejected from dcache.
> 
> Any enlightenment appreciated!
> 


The calls to RCU are coming from here:

	[11]kdb> bt
	Stack traceback for pid 3553
	0xe00002b007230000     3553     3139  1   11   R  0xe00002b0072304f0 *ls
	0xa0000001000feee0 call_rcu
	0xa0000001001a3b20 d_free+0x80
	0xa0000001001a3ec0 dput+0x340
	0xa00000010016bcd0 __fput+0x210
	0xa00000010016baa0 fput+0x40
	0xa000000100168760 filp_close+0xc0
	0xa000000100168960 sys_close+0x180
	0xa000000100011be0 ia64_ret_from_syscall

I see this same backtrace from numerous processes.


-- 
Thanks

Jack Steiner (steiner@xxxxxxx)          651-683-5302
Principal Engineer                      SGI - Silicon Graphics, Inc.


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