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Optimize free_pv_entry(); specifically, avoid repeated TAILQ_REMOVE()s.

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MFC after:	1 week
This commit is contained in:
Alan Cox 2009-02-23 06:00:24 +00:00
parent 2984411d7b
commit 6d65f2fa57
2 changed files with 6 additions and 6 deletions
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6
sys/amd64/amd64/pmap.c
View File

@ -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);

6
sys/i386/i386/pmap.c
View File

@ -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);