Alan Cox 87ee6303e5 Prior to r254304, we only began scanning the active page queue when the ... amount of free memory was close to the point at which we would begin reclaiming pages. Now, we continuously scan the active page queue, regardless of the amount of free memory. Consequently, we are continuously calling pmap_ts_referenced() on active pages. Prior to this change, pmap_ts_referenced() would always demote superpage mappings in order to obtain finer-grained reference information. This made sense because we were coming under memory pressure and would soon have to begin reclaiming pages. Now, however, with continuous scanning of the active page queue, these demotions are taking a toll on performance. To address this problem, I have replaced the demotion with a heuristic for periodically clearing the reference flag on superpage mappings. Approved by: re (kib) Sponsored by: EMC / Isilon Storage Division		2013-09-11 17:23:42 +00:00
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acpica	Consistently use round_page(x) rather than roundup(x, PAGE_SIZE). There is	2013-02-15 22:43:08 +00:00
bios	This isn't functionally identical. In some cases a hint to disable	2012-10-22 13:06:09 +00:00
conf	Add vmx device to the i386 and amd64 NOTES files	2013-09-06 20:24:21 +00:00
i386	Prior to r254304, we only began scanning the active page queue when the	2013-09-11 17:23:42 +00:00
ibcs2	Add a mmap flag (MAP_32BIT) on 64-bit platforms to request that a mapping use	2013-09-09 18:11:59 +00:00
include	Implement PV IPIs for PVHVM guests and further converge PV and HVM	2013-09-06 22:17:02 +00:00
isa	Implement vector callback for PVHVM and unify event channel implementations	2013-08-29 19:52:18 +00:00
linux	Add a mmap flag (MAP_32BIT) on 64-bit platforms to request that a mapping use	2013-09-09 18:11:59 +00:00
pci	Replace kernel virtual address space allocation with vmem. This provides	2013-08-07 06:21:20 +00:00
svr4	Change some movl's to mov's. Newer GAS no longer accept 'movl' instructions	2009-01-31 11:37:21 +00:00
xbox	Move the legacy(4) driver to x86.	2012-03-30 19:10:14 +00:00
xen	Implement PV IPIs for PVHVM guests and further converge PV and HVM	2013-09-06 22:17:02 +00:00
Makefile	Delete duplicate tags entry I introduced in -r223901.	2011-07-15 17:27:26 +00:00