Re: [patch] voluntary-preempt-2.6.8-rc4-O7

[Lee Revell]

On Fri, 2004-08-13 at 06:48, Ingo Molnar wrote:

>  http://redhat.com/~mingo/voluntary-preempt/voluntary-preempt-2.6.8-rc4-O7
> 

Here is the trace resulting from the apt-get filemap_sync() issue:

preemption latency trace v1.0
-----------------------------
 latency: 3656 us, entries: 4000 (8605)
 process: apt-get/21227, uid: 0
 nice: 0, policy: 0, rt_priority: 0
=======>
 0.000ms (+0.000ms): filemap_sync_pte_range (filemap_sync)
 0.000ms (+0.000ms): filemap_sync_pte (filemap_sync_pte_range)
 0.002ms (+0.001ms): set_page_dirty (filemap_sync_pte)
 0.002ms (+0.000ms): __set_page_dirty_buffers (set_page_dirty)
 0.004ms (+0.001ms): radix_tree_tag_set (__set_page_dirty_buffers)
 0.006ms (+0.001ms): __mark_inode_dirty (__set_page_dirty_buffers)
 0.008ms (+0.001ms): filemap_sync_pte (filemap_sync_pte_range)
 0.009ms (+0.000ms): set_page_dirty (filemap_sync_pte)
 0.009ms (+0.000ms): __set_page_dirty_buffers (set_page_dirty)
 0.010ms (+0.000ms): radix_tree_tag_set (__set_page_dirty_buffers)
 0.011ms (+0.000ms): __mark_inode_dirty (__set_page_dirty_buffers)
 0.011ms (+0.000ms): filemap_sync_pte (filemap_sync_pte_range)
 0.012ms (+0.000ms): set_page_dirty (filemap_sync_pte)
 0.012ms (+0.000ms): __set_page_dirty_buffers (set_page_dirty)
 0.013ms (+0.000ms): radix_tree_tag_set (__set_page_dirty_buffers)
 0.013ms (+0.000ms): __mark_inode_dirty (__set_page_dirty_buffers)
 0.014ms (+0.000ms): filemap_sync_pte (filemap_sync_pte_range)
 0.014ms (+0.000ms): filemap_sync_pte (filemap_sync_pte_range)
 0.015ms (+0.000ms): filemap_sync_pte (filemap_sync_pte_range)
 0.016ms (+0.000ms): filemap_sync_pte (filemap_sync_pte_range)
 0.016ms (+0.000ms): filemap_sync_pte (filemap_sync_pte_range)
 0.017ms (+0.000ms): set_page_dirty (filemap_sync_pte)
 0.017ms (+0.000ms): __set_page_dirty_buffers (set_page_dirty)
 0.018ms (+0.000ms): radix_tree_tag_set (__set_page_dirty_buffers)
 0.019ms (+0.000ms): __mark_inode_dirty (__set_page_dirty_buffers)
 0.019ms (+0.000ms): filemap_sync_pte (filemap_sync_pte_range)
 0.019ms (+0.000ms): filemap_sync_pte (filemap_sync_pte_range)
 0.020ms (+0.000ms): filemap_sync_pte (filemap_sync_pte_range)
 0.020ms (+0.000ms): filemap_sync_pte (filemap_sync_pte_range)
 0.021ms (+0.000ms): filemap_sync_pte (filemap_sync_pte_range)
 0.022ms (+0.000ms): set_page_dirty (filemap_sync_pte)
 0.022ms (+0.000ms): __set_page_dirty_buffers (set_page_dirty)
 0.023ms (+0.000ms): radix_tree_tag_set (__set_page_dirty_buffers)
 0.023ms (+0.000ms): __mark_inode_dirty (__set_page_dirty_buffers)
 
[ zillons of these deleted ]

 1.960ms (+0.000ms): filemap_sync_pte (filemap_sync_pte_range)
 1.960ms (+0.000ms): set_page_dirty (filemap_sync_pte)
 1.961ms (+0.000ms): __set_page_dirty_buffers (set_page_dirty)
 1.961ms (+0.000ms): preempt_schedule (__set_page_dirty_buffers)
 1.961ms (+0.000ms): radix_tree_tag_set (__set_page_dirty_buffers)
 1.962ms (+0.000ms): preempt_schedule (__set_page_dirty_buffers)
 1.962ms (+0.000ms): __mark_inode_dirty (__set_page_dirty_buffers)
 1.963ms (+0.000ms): filemap_sync_pte (filemap_sync_pte_range)
 1.964ms (+0.000ms): set_page_dirty (filemap_sync_pte)
 1.964ms (+0.000ms): __set_page_dirty_buffers (set_page_dirty)
 1.964ms (+0.000ms): preempt_schedule (__set_page_dirty_buffers)
 1.965ms (+0.000ms): radix_tree_tag_set (__set_page_dirty_buffers)

Lee



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