* Re: [Bug 5493] New: mprotect usage causing slow system performance and freezing
[not found] <200510251108.j9PB8EZJ025221@fire-1.osdl.org>
@ 2005-10-26 4:52 ` Andrew Morton
0 siblings, 0 replies; only message in thread
From: Andrew Morton @ 2005-10-26 4:52 UTC (permalink / raw)
To: linux-mm; +Cc: bugme-daemon
http://bugzilla.kernel.org/show_bug.cgi?id=5493
This real-world application is failing due to the new rmap code. There are
a large number of vmas and the linear searches in rmap.c are completely
killing us.
Profile:
c01608f0 __link_path_walk 1 0.0003
c016ace8 __d_lookup 1 0.0036
c0191b70 gcc2_compiled. 1 0.0071
c023a368 _raw_spin_unlock 1 0.0078
c02fe410 ide_inb 1 0.0625
c0117580 write_profile 2 0.0377
c013da20 kmem_flagcheck 2 0.0385
c013e4c8 kmem_cache_alloc 2 0.0143
c01406d4 shrink_list 2 0.0020
c0143a10 zap_pte_range 2 0.0032
c014ba50 get_swap_page 2 0.0032
c0236634 radix_tree_preload 2 0.0179
c02da3e0 generic_make_request 2 0.0044
c02fe468 ide_outb 2 0.1250
c041f47c _write_unlock_irqrestore 2 0.0833
c01395c0 __alloc_pages 3 0.0031
c0139ccc __mod_page_state 3 0.1250
c013e150 cache_alloc_debugcheck_after 3 0.0112
c0144910 do_wp_page 3 0.0037
c0149ec0 page_referenced 3 0.0197
c014bcbc swap_info_get 3 0.0197
c015807c bio_alloc 3 0.0750
c041f494 _write_unlock_irq 4 0.2000
c013cac4 check_poison_obj 5 0.0137
c0142bd0 page_address 9 0.0625
c041f890 do_page_fault 9 0.0054
c0149bbc page_check_address 11 0.0573
c041f40c _spin_unlock_irq 18 0.9000
c0139380 buffered_rmqueue 32 0.0748
c014a024 try_to_unmap_one 782 1.7455
c014a400 try_to_unmap_anon 1511 11.1103
c0149c7c page_referenced_one 4169 17.0861
c0149d70 page_referenced_anon 8498 62.4853
00000000 total 15109 0.0046
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[not found] <200510251108.j9PB8EZJ025221@fire-1.osdl.org>
2005-10-26 4:52 ` [Bug 5493] New: mprotect usage causing slow system performance and freezing Andrew Morton
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