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    SubjectRe: RCU scaling on large systems
    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.


    Jack Steiner ( 651-683-5302
    Principal Engineer SGI - Silicon Graphics, Inc.

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