Author: alc
Date: Mon Feb 23 06:00:24 2009
New Revision: 188932
URL: http://svn.freebsd.org/changeset/base/188932
Log:
Optimize free_pv_entry(); specifically, avoid repeated TAILQ_REMOVE()s.
MFC after: 1 week
Modified:
head/sys/amd64/amd64/pmap.c
head/sys/i386/i386/pmap.c
Modified: head/sys/amd64/amd64/pmap.c
==============================================================================
--- head/sys/amd64/amd64/pmap.c Sun Feb 22 20:11:10 2009 (r188931)
+++ head/sys/amd64/amd64/pmap.c Mon Feb 23 06:00:24 2009 (r188932)
@@ -1932,15 +1932,15 @@ free_pv_entry(pmap_t pmap, pv_entry_t pv
pc->pc_map[field] |= 1ul << bit;
/* move to head of list */
TAILQ_REMOVE(&pmap->pm_pvchunk, pc, pc_list);
- TAILQ_INSERT_HEAD(&pmap->pm_pvchunk, pc, pc_list);
if (pc->pc_map[0] != PC_FREE0 || pc->pc_map[1] != PC_FREE1 ||
- pc->pc_map[2] != PC_FREE2)
+ pc->pc_map[2] != PC_FREE2) {
+ TAILQ_INSERT_HEAD(&pmap->pm_pvchunk, pc, pc_list);
return;
+ }
PV_STAT(pv_entry_spare -= _NPCPV);
PV_STAT(pc_chunk_count--);
PV_STAT(pc_chunk_frees++);
/* entire chunk is free, return it */
- TAILQ_REMOVE(&pmap->pm_pvchunk, pc, pc_list);
m = PHYS_TO_VM_PAGE(DMAP_TO_PHYS((vm_offset_t)pc));
dump_drop_page(m->phys_addr);
vm_page_unwire(m, 0);
Modified: head/sys/i386/i386/pmap.c
==============================================================================
--- head/sys/i386/i386/pmap.c Sun Feb 22 20:11:10 2009 (r188931)
+++ head/sys/i386/i386/pmap.c Mon Feb 23 06:00:24 2009 (r188932)
@@ -1975,15 +1975,15 @@ free_pv_entry(pmap_t pmap, pv_entry_t pv
pc->pc_map[field] |= 1ul << bit;
/* move to head of list */
TAILQ_REMOVE(&pmap->pm_pvchunk, pc, pc_list);
- TAILQ_INSERT_HEAD(&pmap->pm_pvchunk, pc, pc_list);
for (idx = 0; idx < _NPCM; idx++)
- if (pc->pc_map[idx] != pc_freemask[idx])
+ if (pc->pc_map[idx] != pc_freemask[idx]) {
+ TAILQ_INSERT_HEAD(&pmap->pm_pvchunk, pc, pc_list);
return;
+ }
PV_STAT(pv_entry_spare -= _NPCPV);
PV_STAT(pc_chunk_count--);
PV_STAT(pc_chunk_frees++);
/* entire chunk is free, return it */
- TAILQ_REMOVE(&pmap->pm_pvchunk, pc, pc_list);
m = PHYS_TO_VM_PAGE(pmap_kextract((vm_offset_t)pc));
pmap_qremove((vm_offset_t)pc, 1);
vm_page_unwire(m, 0);
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