On Thu, Sep 26, 2002 at 05:29:09AM -0700, William Lee Irwin III wrote:

quoted

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.


Thanks,
Bill
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