RE: [RFC] add sysfs to dynamically control blk request tag maintenance

["Chen, Kenneth W" <kenneth.w.chen@intel.com>]

Crap .... (my silly mail client doesn't line up tab correctly)
Repost the profile.

Latest execution profile taken with 2.6.14-rc2 kernel with "industry
standard transaction processing database workload".  First column is
clock ticks (a direct measure of time), 2nd column is instruction
retired, and 3rd column is number of L3 misses occurred inside the
function.

Symbol                  Clktick  Inst.
                                 Retired  L3 Misses
scsi_request_fn         8.12%    9.27%    11.18%
Schedule                6.52%    4.93%    7.26%
scsi_end_request        4.44%    3.59%    6.76%
__blockdev_direct_IO    4.28%    4.38%    3.98%
__make_request          3.59%    4.16%    3.47%
__wake_up               2.46%    1.56%    3.33%
dio_bio_end_io          2.14%    1.67%    3.18%
aio_complete            2.05%    1.27%    3.56%
kmem_cache_free         1.95%    1.70%    0.71%
kmem_cache_alloc        1.45%    1.84%    0.45%
put_page                1.42%    0.60%    1.27%
follow_hugetlb_page     1.41%    0.75%    1.27%
__generic_file_aio_read 1.37%    0.36%    1.68%
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