William Lee Irwin III wrote:

On Wed, Dec 18, 2002 at 09:53:18PM -0800, Andrew Morton wrote:

quoted

quoted

quoted

url: http://www.zip.com.au/~akpm/linux/patches/2.5/2.5.52/2.5.52-mm2/

On Thu, Dec 19, 2002 at 12:54:26AM -0800, William Lee Irwin III wrote:

quoted

quoted

Kernel compile on ramfs, shpte off, overcommit on (probably more like a
stress test for shpte):

On Thu, Dec 19, 2002 at 01:28:53AM -0800, William Lee Irwin III wrote:

quoted

With shpte on:

With the following patch:

c013d4d4 94944    0.310788    zap_pte_range
c01355d0 104773   0.342962    nr_free_pages
c014f65c 107566   0.352105    __fput
c01b1750 112055   0.366799    __copy_user_intel
c0115350 121040   0.39621     smp_apic_timer_interrupt
c0119814 126089   0.412738    kmap_atomic
c014b6cc 145095   0.474952    pte_unshare
c01fb11c 145992   0.477888    sync_buffer
c0122a78 148079   0.484719    current_kernel_time
c01168b8 193805   0.634398    x86_profile_hook
c013f140 205233   0.671806    do_no_page
c0164aac 235356   0.77041     d_lookup
c01b18f8 257358   0.842431    __copy_from_user
c0131f7c 275559   0.90201     find_get_page
c011a560 282341   0.92421     scheduler_tick
c0140090 300128   0.982434    vm_enough_memory
c013f4bc 310474   1.0163      handle_mm_fault
c014f3d0 312725   1.02367     get_empty_filp
c011a0a8 365066   1.195       load_balance
c014f9e9 502737   1.64565     .text.lock.file_table
c01b1890 719105   2.35391     __copy_to_user
c0135768 911894   2.98498     __get_page_state
c013ee50 952823   3.11895     do_anonymous_page
c01436d0 1079864  3.53481     page_add_rmap
c01438cc 1186938  3.8853      page_remove_rmap
c0106f38 17763755 58.1476     poll_idle

Is that improved?

pfn_to_nid() got lots of icache misses. Try using a macro.

What's the callsite?

Actually, just looking at mmzone.h, I have to say "ick".  The
non-NUMA case seems unnecessarily overdone.  eg:

#define page_to_pfn(page)
	((page - page_zone(page)->zone_mem_map) + page_zone(page)->zone_start_pfn)

Ouch.  Why can't we have the good old `page - mem_map' here?
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