Messages in this thread | | | Date | Thu, 26 Sep 2002 05:42:44 -0700 | From | William Lee Irwin III <> | Subject | Re: 2.5.38-mm3 |
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On Thu, Sep 26, 2002 at 05:29:09AM -0700, William Lee Irwin III wrote: >> Is there an update to the files_struct stuff too? I'm seeing large >> overheads there also.
On Thu, Sep 26, 2002 at 06:10:52PM +0530, Dipankar Sarma wrote: > files_struct_rcu is not in mm kernels, but I will upload the most > recent version to the same download directory in LSE. > I would be interested in fget() profile count change with that patch.
In my experience fget() is large even on UP kernels. For instance, a UP profile from a long-running interactive load UP box (my home machine):
228542527 total 169.5902 216163353 default_idle 4503403.1875 850707 number 781.8998 829885 handle_IRQ_event 8644.6354 687351 proc_getdata 1227.4125 454401 system_call 8114.3036 446452 csum_partial_copy_generic 1800.2097 330157 tcp_sendmsg 76.4252 300022 vsnprintf 284.1117 271134 __generic_copy_to_user 3389.1750 237151 fget 3705.4844 222390 proc_pid_stat 308.8750 210759 fput 878.1625 186408 tcp_ioctl 314.8784 179146 sys_ioctl 238.2261 177419 do_softirq 1232.0764 167881 kmem_cache_free 1165.8403 154854 skb_clone 387.1350 149377 d_lookup 444.5744 139131 kmem_cache_alloc 668.8990 138638 kfree 866.4875 132555 sys_write 637.2837
This is only aggravated by cacheline bouncing on SMP. The reductions of system cpu time will doubtless be beneficial for all.
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