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SubjectRe: RCU scaling on large systems
Jack Steiner <steiner@sgi.com> wrote:
>
> 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.

eh? Why is dput freeing the dentry? It should just be leaving it in cache.

What filesystem is being used? procfs?
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