Hi,
This patch series add support for numa faults on ppc64 architecture. We steal the
_PAGE_COHERENCE bit and use that for indicating _PAGE_NUMA. We clear the _PAGE_PRESENT bit
and also invalidate the hpte entry on setting _PAGE_NUMA. The next fault on that
page will be considered a numa fault.
NOTE:
______
Issue:
I am finding large lock contention on page_table_lock with this series on a 95 cpu 4 node box with autonuma benchmark
I will out on vacation till NOV 6 without email access. Hence i will not be able to respond to review feedbacks
till then.
lock_stat version 0.3
-------------------------------------------------------------------------------------------------------------------------------------------------------
class name con-bounces contentions waittime-min waittime-max waittime-total acq-bounces acquisitions holdtime-mi hold time hold total
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------
&(&mm->page_table_lock)->rlock: 713531791 719610919 0.09 3038193.19 357867523236.3 729709189 750040162 0.0 236991.36 1159646899.68
------------------------------
&(&mm->page_table_lock)->rlock 1 [<c000000000218880>] .anon_vma_prepare+0xb0/0x1e0
&(&mm->page_table_lock)->rlock 93 [<c000000000207ebc>] .do_numa_page+0x4c/0x190
&(&mm->page_table_lock)->rlock 301678 [<c0000000002139d4>] .change_protection+0x1d4/0x560
&(&mm->page_table_lock)->rlock 244524 [<c000000000213be8>] .change_protection+0x3e8/0x560
------------------------------
&(&mm->page_table_lock)->rlock 1 [<c000000000206a38>] .__do_fault+0x198/0x6b0
&(&mm->page_table_lock)->rlock 704163 [<c0000000002139d4>] .change_protection+0x1d4/0x560
&(&mm->page_table_lock)->rlock 207227 [<c000000000213be8>] .change_protection+0x3e8/0x560
&(&mm->page_table_lock)->rlock 95 [<c000000000207ebc>] .do_numa_page+0x4c/0x190
-aneesh
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