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- Try harder to report dirty page.

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- Garbage-collect pmap_update(), it became quite useless.
This commit is contained in:
Olivier Houchard 2005-04-07 22:01:53 +00:00
parent 9b99e9b910
commit 139e3f7c33
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=144760
2 changed files with 106 additions and 54 deletions
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158
sys/arm/arm/pmap.c
View File

@ -402,7 +402,7 @@ int pmap_needs_pte_sync;
/*
* Data for the pv entry allocation mechanism
*/
#define MINPV 1024
#define MINPV 2048
#ifndef PMAP_SHPGPERPROC
#define PMAP_SHPGPERPROC 200
@ -1204,6 +1204,18 @@ pmap_dcache_wbinv_all(pmap_t pm)
cpu_dcache_wbinv_all();
}
/*
* this routine defines the region(s) of memory that should
* not be tested for the modified bit.
*/
static PMAP_INLINE int
pmap_track_modified(vm_offset_t va)
{
if ((va < kmi.clean_sva) || (va >= kmi.clean_eva))
return 1;
else
return 0;
}
/*
* PTE_SYNC_CURRENT:
*
@ -1538,7 +1550,6 @@ pmap_clearbit(struct vm_page *pg, u_int maskbits)
pm = pv->pv_pmap;
oflags = pv->pv_flags;
pv->pv_flags &= ~maskbits;
pmap_update(pv->pv_pmap);
#if 0
pmap_acquire_pmap_lock(pm);
@ -1549,7 +1560,8 @@ pmap_clearbit(struct vm_page *pg, u_int maskbits)
ptep = &l2b->l2b_kva[l2pte_index(va)];
npte = opte = *ptep;
if (maskbits & (PVF_WRITE|PVF_MOD)) {
if (maskbits & (PVF_WRITE|PVF_MOD) &&
!pmap_track_modified(pv->pv_va)) {
if ((pv->pv_flags & PVF_NC)) {
/*
* Entry is not cacheable:
@ -1570,6 +1582,7 @@ pmap_clearbit(struct vm_page *pg, u_int maskbits)
}
} else
if (opte & L2_S_PROT_W) {
vm_page_dirty(pg);
/*
* Entry is writable/cacheable: check if pmap
* is current if it is flush it, otherwise it
@ -1606,7 +1619,7 @@ pmap_clearbit(struct vm_page *pg, u_int maskbits)
}
}
if (maskbits & PVF_REF) {
if (maskbits & PVF_REF && !pmap_track_modified(pv->pv_va)) {
if ((pv->pv_flags & PVF_NC) == 0 &&
(maskbits & (PVF_WRITE|PVF_MOD)) == 0) {
/*
@ -1706,6 +1719,7 @@ pmap_enter_pv(struct vm_page *pg, struct pv_entry *pve, pmap_t pm,
mtx_lock(&pg->md.pvh_mtx);
#endif
TAILQ_INSERT_HEAD(&pg->md.pv_list, pve, pv_list);
TAILQ_INSERT_HEAD(&pm->pm_pvlist, pve, pv_plist);
pg->md.pvh_attrs |= flags & (PVF_REF | PVF_MOD);
if (pm == pmap_kernel()) {
if (flags & PVF_WRITE)
@ -1723,6 +1737,7 @@ pmap_enter_pv(struct vm_page *pg, struct pv_entry *pve, pmap_t pm,
#endif
if (pve->pv_flags & PVF_WIRED)
++pm->pm_stats.wired_count;
vm_page_flag_set(pg, PG_REFERENCED);
}
/*
@ -1779,9 +1794,12 @@ pmap_nuke_pv(struct vm_page *pg, pmap_t pm, struct pv_entry *pve)
{
TAILQ_REMOVE(&pg->md.pv_list, pve, pv_list);
TAILQ_REMOVE(&pm->pm_pvlist, pve, pv_plist);
if (pve->pv_flags & PVF_WIRED)
--pm->pm_stats.wired_count;
pg->md.pv_list_count--;
if (pg->md.pvh_attrs & PVF_MOD)
vm_page_dirty(pg);
if (pm == pmap_kernel()) {
if (pve->pv_flags & PVF_WRITE)
pg->md.krw_mappings--;
@ -1792,8 +1810,18 @@ pmap_nuke_pv(struct vm_page *pg, pmap_t pm, struct pv_entry *pve)
pg->md.urw_mappings--;
else
pg->md.uro_mappings--;
if (TAILQ_FIRST(&pg->md.pv_list) == NULL)
if (TAILQ_FIRST(&pg->md.pv_list) == NULL ||
(pg->md.krw_mappings == 0 && pg->md.urw_mappings == 0)) {
pg->md.pvh_attrs &= ~PVF_MOD;
if (TAILQ_FIRST(&pg->md.pv_list) == NULL)
pg->md.pvh_attrs &= ~PVF_REF;
vm_page_flag_clear(pg, PG_WRITEABLE);
} else if (pmap_track_modified(pve->pv_va))
vm_page_dirty(pg);
if (TAILQ_FIRST(&pg->md.pv_list))
vm_page_flag_set(pg, PG_REFERENCED);
if (pve->pv_flags & PVF_WRITE)
pmap_vac_me_harder(pg, pm, 0);
}
static struct pv_entry *
@ -1869,6 +1897,11 @@ pmap_modify_pv(struct vm_page *pg, pmap_t pm, vm_offset_t va,
pg->md.uro_mappings++;
pg->md.urw_mappings--;
}
if (pg->md.krw_mappings == 0 && pg->md.urw_mappings == 0) {
pg->md.pvh_attrs &= ~PVF_MOD;
vm_page_flag_clear(pg, PG_WRITEABLE);
}
pmap_vac_me_harder(pg, pm, 0);
}
return (oflags);
@ -2014,7 +2047,10 @@ pmap_fault_fixup(pmap_t pm, vm_offset_t va, vm_prot_t ftype, int user)
goto out;
}
pg->md.pvh_attrs |= PVF_REF | PVF_MOD;
if (pmap_track_modified(pv->pv_va)) {
pg->md.pvh_attrs |= PVF_REF | PVF_MOD;
vm_page_dirty(pg);
}
pv->pv_flags |= PVF_REF | PVF_MOD;
/*
@ -2038,13 +2074,16 @@ pmap_fault_fixup(pmap_t pm, vm_offset_t va, vm_prot_t ftype, int user)
struct vm_page *pg;
/* Extract the physical address of the page */
if ((pg = PHYS_TO_VM_PAGE(pa)) == NULL)
vm_page_lock_queues();
if ((pg = PHYS_TO_VM_PAGE(pa)) == NULL) {
vm_page_unlock_queues();
goto out;
}
/* Get the current flags for this page. */
pv = pmap_find_pv(pg, pm, va);
if (pv == NULL) {
vm_page_unlock_queues();
goto out;
}
@ -2055,6 +2094,7 @@ pmap_fault_fixup(pmap_t pm, vm_offset_t va, vm_prot_t ftype, int user)
*ptep = (pte & ~L2_TYPE_MASK) | L2_S_PROTO;
PTE_SYNC(ptep);
rv = 1;
vm_page_unlock_queues();
}
/*
@ -2486,6 +2526,7 @@ pmap_bootstrap(vm_offset_t firstaddr, vm_offset_t lastaddr, struct pv_addr *l1pt
kernel_pmap->pm_active = -1;
kernel_pmap->pm_domain = PMAP_DOMAIN_KERNEL;
LIST_INIT(&allpmaps);
TAILQ_INIT(&kernel_pmap->pm_pvlist);
LIST_INSERT_HEAD(&allpmaps, kernel_pmap, pm_list);
/*
@ -2585,7 +2626,7 @@ pmap_grow_map(vm_offset_t va, pt_entry_t cache_mode, vm_paddr_t *pap)
vm_paddr_t pa;
struct vm_page *pg;
pg = vm_page_alloc(NULL, 0, VM_ALLOC_NOOBJ | VM_ALLOC_SYSTEM |
pg = vm_page_alloc(NULL, 0, VM_ALLOC_NOOBJ | VM_ALLOC_ZERO |
VM_ALLOC_WIRED);
if (pg == NULL)
return (1);
@ -2600,7 +2641,6 @@ pmap_grow_map(vm_offset_t va, pt_entry_t cache_mode, vm_paddr_t *pap)
*ptep = L2_S_PROTO | pa | cache_mode |
L2_S_PROT(PTE_KERNEL, VM_PROT_READ | VM_PROT_WRITE);
PTE_SYNC(ptep);
memset((void *)va, 0, PAGE_SIZE);
return (0);
}
@ -2772,7 +2812,34 @@ pmap_page_protect(vm_page_t m, vm_prot_t prot)
void
pmap_remove_pages(pmap_t pmap, vm_offset_t sva, vm_offset_t eva)
{
struct pv_entry *pv, *npv;
struct l2_bucket *l2b = NULL;
vm_page_t m;
pt_entry_t *pt;
vm_page_lock_queues();
for (pv = TAILQ_FIRST(&pmap->pm_pvlist); pv; pv = npv) {
if (pv->pv_va >= eva || pv->pv_va < sva) {
npv = TAILQ_NEXT(pv, pv_plist);
continue;
}
if (pv->pv_flags & PVF_WIRED) {
/* The page is wired, cannot remove it now. */
npv = TAILQ_NEXT(pv, pv_plist);
continue;
}
pmap->pm_stats.resident_count--;
l2b = pmap_get_l2_bucket(pmap, pv->pv_va);
KASSERT(l2b != NULL, ("No L2 bucket in pmap_remove_pages"));
pt = &l2b->l2b_kva[l2pte_index(pv->pv_va)];
m = PHYS_TO_VM_PAGE(*pt & L2_ADDR_MASK);
*pt = 0;
PTE_SYNC(pt);
npv = TAILQ_NEXT(pv, pv_plist);
pmap_nuke_pv(m, pmap, pv);
pmap_free_pv_entry(pv);
}
vm_page_unlock_queues();
cpu_idcache_wbinv_all();
cpu_tlb_flushID();
cpu_cpwait();
@ -2859,9 +2926,8 @@ pmap_kremove(vm_offset_t va)
cpu_dcache_wbinv_range(va, PAGE_SIZE);
cpu_tlb_flushD_SE(va);
cpu_cpwait();
}
if (opte)
*pte = 0;
}
}
@ -2902,8 +2968,8 @@ pmap_wb_page(vm_page_t m)
struct pv_entry *pv;
TAILQ_FOREACH(pv, &m->md.pv_list, pv_list)
pmap_dcache_wb_range(pv->pv_pmap, pv->pv_va, PAGE_SIZE, FALSE,
(pv->pv_flags & PVF_WRITE) == 0);
pmap_dcache_wb_range(pv->pv_pmap, pv->pv_va, PAGE_SIZE, FALSE,
(pv->pv_flags & PVF_WRITE) == 0);
}
/*
@ -3060,12 +3126,10 @@ pmap_remove_all(vm_page_t m)
if (TAILQ_EMPTY(&m->md.pv_list))
return;
curpm = vmspace_pmap(curproc->p_vmspace);
pmap_update(curpm);
while ((pv = TAILQ_FIRST(&m->md.pv_list)) != NULL) {
if (flush == FALSE && (pv->pv_pmap == curpm ||
pv->pv_pmap == pmap_kernel()))
flush = TRUE;
pmap_update(pv->pv_pmap);
l2b = pmap_get_l2_bucket(pv->pv_pmap, pv->pv_va);
KASSERT(l2b != NULL, ("No l2 bucket"));
ptep = &l2b->l2b_kva[l2pte_index(pv->pv_va)];
@ -3087,7 +3151,6 @@ pmap_remove_all(vm_page_t m)
else
pmap_tlb_flushD(curpm);
}
}
@ -3121,7 +3184,6 @@ pmap_protect(pmap_t pm, vm_offset_t sva, vm_offset_t eva, vm_prot_t prot)
mtx_lock(&Giant);
pmap_update(pm);
/*
* OK, at this point, we know we're doing write-protect operation.
* If the pmap is active, write-back the range.
@ -3131,6 +3193,7 @@ pmap_protect(pmap_t pm, vm_offset_t sva, vm_offset_t eva, vm_prot_t prot)
flush = ((eva - sva) >= (PAGE_SIZE * 4)) ? 0 : -1;
flags = 0;
vm_page_lock_queues();
while (sva < eva) {
next_bucket = L2_NEXT_BUCKET(sva);
if (next_bucket > eva)
@ -3158,6 +3221,8 @@ pmap_protect(pmap_t pm, vm_offset_t sva, vm_offset_t eva, vm_prot_t prot)
f = pmap_modify_pv(pg, pm, sva,
PVF_WRITE, 0);
pmap_vac_me_harder(pg, pm, sva);
if (pmap_track_modified(sva))
vm_page_dirty(pg);
} else
f = PVF_REF | PVF_EXEC;
@ -3185,6 +3250,7 @@ pmap_protect(pmap_t pm, vm_offset_t sva, vm_offset_t eva, vm_prot_t prot)
if (PV_BEEN_REFD(flags))
pmap_tlb_flushD(pm);
}
vm_page_unlock_queues();
mtx_unlock(&Giant);
}
@ -3209,13 +3275,12 @@ pmap_enter(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_prot_t prot,
{
struct l2_bucket *l2b = NULL;
struct vm_page *opg;
struct pv_entry *pve;
struct pv_entry *pve = NULL;
pt_entry_t *ptep, npte, opte;
u_int nflags;
u_int oflags;
vm_paddr_t pa;
pmap_update(pmap);
vm_page_lock_queues();
if (va == vector_page) {
pa = systempage.pv_pa;
@ -3271,9 +3336,8 @@ pmap_enter(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_prot_t prot,
nflags |= PVF_REF;
if (((prot & VM_PROT_WRITE) != 0 &&
m && ((m->flags & PG_WRITEABLE) ||
(m->md.pvh_attrs & PVF_MOD) != 0))) {
if (m && ((prot & VM_PROT_WRITE) != 0 ||
(m->md.pvh_attrs & PVF_MOD))) {
/*
* This is a writable mapping, and the
* page's mod state indicates it has
@ -3281,7 +3345,12 @@ pmap_enter(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_prot_t prot,
* writable from the outset.
*/
nflags |= PVF_MOD;
if (!(m->md.pvh_attrs & PVF_MOD) &&
pmap_track_modified(va))
vm_page_dirty(m);
}
if (m && opte)
vm_page_flag_set(m, PG_REFERENCED);
} else {
/*
* Need to do page referenced emulation.
@ -3330,9 +3399,10 @@ pmap_enter(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_prot_t prot,
simple_lock(&opg->mdpage.pvh_slock);
#endif
pve = pmap_remove_pv(opg, pmap, va);
if (!m)
if (m && (m->flags & (PG_UNMANAGED | PG_FICTITIOUS)) && pve)
pmap_free_pv_entry(pve);
pmap_vac_me_harder(opg, pmap, 0);
else if (!pve)
pve = pmap_get_pv_entry();
KASSERT(pve != NULL, ("No pv"));
#if 0
simple_unlock(&opg->mdpage.pvh_slock);
@ -3361,7 +3431,7 @@ pmap_enter(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_prot_t prot,
if ((pve = pmap_get_pv_entry()) == NULL) {
panic("pmap_enter: no pv entries");
}
if (m)
if (m && !(m->flags & (PG_UNMANAGED | PG_FICTITIOUS)))
pmap_enter_pv(m, pve, pmap, va, nflags);
}
/*
@ -3406,7 +3476,7 @@ pmap_enter(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_prot_t prot,
pl1pd = &pmap->pm_l1->l1_kva[L1_IDX(va)];
l1pd = l2b->l2b_phys | L1_C_DOM(pmap->pm_domain) |
L1_C_PROTO | pte_l1_s_cache_mode_pt;
L1_C_PROTO;
if (*pl1pd != l1pd) {
*pl1pd = l1pd;
PTE_SYNC(pl1pd);
@ -3444,7 +3514,7 @@ pmap_enter_quick(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_page_t mpte)
VM_OBJECT_UNLOCK(m->object);
mtx_lock(&Giant);
pmap_enter(pmap, va, m, VM_PROT_READ|VM_PROT_EXECUTE, FALSE);
pmap_dcache_wbinv_all(pmap); /* XXX: shouldn't be needed */
pmap_dcache_wbinv_all(pmap);
mtx_unlock(&Giant);
VM_OBJECT_LOCK(m->object);
vm_page_lock_queues();
@ -3616,22 +3686,6 @@ pmap_extract_and_hold(pmap_t pmap, vm_offset_t va, vm_prot_t prot)
return (m);
}
void
pmap_update(pmap_t pm)
{
if (pmap_is_current(pm)) {
/*
* If we're dealing with a current userland pmap, move its L1
* to the end of the LRU.
*/
if (pm != pmap_kernel())
pmap_use_l1(pm);
}
}
/*
* Initialize a preallocated and zeroed pmap structure,
* such as one in a vmspace structure.
@ -3649,12 +3703,12 @@ pmap_pinit(pmap_t pmap)
pmap->pm_count = 1;
pmap->pm_active = 0;
TAILQ_INIT(&pmap->pm_pvlist);
bzero(&pmap->pm_stats, sizeof pmap->pm_stats);
pmap->pm_stats.resident_count = 1;
if (vector_page < KERNBASE) {
pmap_enter(pmap, vector_page, PHYS_TO_VM_PAGE(systempage.pv_pa),
VM_PROT_READ, 1);
pmap_update(pmap);
}
}
@ -3726,7 +3780,6 @@ pmap_remove(pmap_t pm, vm_offset_t sva, vm_offset_t eva)
#endif
vm_page_lock_queues();
pmap_update(pm);
if (!pmap_is_current(pm)) {
cleanlist_idx = PMAP_REMOVE_CLEAN_LIST_SIZE + 1;
} else
@ -3864,15 +3917,13 @@ pmap_remove(pmap_t pm, vm_offset_t sva, vm_offset_t eva)
PTE_SYNC_CURRENT(pm, cleanlist[cnt].pte);
}
/*
* If it looks like we're removing a whole bunch
* of mappings, it's faster to just write-back
* the whole cache now and defer TLB flushes until
* pmap_update() is called.
*/
if (total <= PMAP_REMOVE_CLEAN_LIST_SIZE)
cleanlist_idx = 0;
else {
/*
* We are removing so much entries it's just
* easier to flush the whole cache.
*/
cleanlist_idx = PMAP_REMOVE_CLEAN_LIST_SIZE + 1;
pmap_idcache_wbinv_all(pm);
flushall = 1;
@ -4080,7 +4131,6 @@ pmap_clean_page(struct pv_entry *pv, boolean_t is_src)
for (npv = pv; npv; npv = TAILQ_NEXT(npv, pv_list)) {
if (npv->pv_pmap == pmap_kernel() || npv->pv_pmap == pm) {
flags |= npv->pv_flags;
pmap_update(npv->pv_pmap);
/*
* The page is mapped non-cacheable in
* this map. No need to flush the cache.

2
sys/arm/include/pmap.h
View File

@ -143,6 +143,7 @@ struct pmap {
int pm_count; /* reference count */
int pm_active; /* active on cpus */
struct pmap_statistics pm_stats; /* pmap statictics */
TAILQ_HEAD(,pv_entry) pm_pvlist; /* list of mappings in pmap */
LIST_ENTRY(pmap) pm_list; /* List of all pmaps */
};
@ -163,6 +164,7 @@ typedef struct pv_entry {
pmap_t pv_pmap; /* pmap where mapping lies */
vm_offset_t pv_va; /* virtual address for mapping */
TAILQ_ENTRY(pv_entry) pv_list;
TAILQ_ENTRY(pv_entry) pv_plist;
int pv_flags; /* flags (wired, etc...) */
} *pv_entry_t;