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When doing qgroup accounting, we call ulist_alloc()/ulist_free() every time
when we want to walk qgroup tree.
By introducing 'qgroup_ulist', we only need to call ulist_alloc()/ulist_free()
once. This reduce some sys time to allocate memory, see the measurements below
fsstress -p 4 -n 10000 -d $dir
With this patch:
real 0m50.153s
user 0m0.081s
sys 0m6.294s
real 0m51.113s
user 0m0.092s
sys 0m6.220s
real 0m52.610s
user 0m0.096s
sys 0m6.125s avg 6.213
-----------------------------------------------------
Without the patch:
real 0m54.825s
user 0m0.061s
sys 0m10.665s
real 1m6.401s
user 0m0.089s
sys 0m11.218s
real 1m13.768s
user 0m0.087s
sys 0m10.665s avg 10.849
we can see the sys time reduce ~43%.
Signed-off-by: Wang Shilong <wangsl-fnst@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
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