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https://github.com/freebsd/freebsd-src
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o s/vhpt_size/pmap_vhpt_log2size/g
o s/vhpt_base/pmap_vhpt_base/g o s/vhpt_bucket/pmap_vhpt_bucket/g o Declare the above in <machine/pmap.h> o Move the vm.stats.vhpt.* sysctls to machdep.vhpt.* o Create a tunable machdep.vhpt.log2size, with corresponding sysctl. The tunable allows the user to specify the VHPT size from the loader. o Don't keep track of the number of PTEs in the VHPT. Calculate the population when necessary by iterating the buckets and summing up the length of the buckets. o Don't perform the tpa instruction with a bucket lock held. The instruction can (theoretically) fault and locking is not needed.
This commit is contained in:
Marcel Moolenaar
parent
a8cbc96cd8
commit
5280c8c2ab
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=149777
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@ -64,8 +64,6 @@ MALLOC_DECLARE(M_PMAP);
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void ia64_ap_startup(void);
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extern uint64_t vhpt_base[];
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extern size_t vhpt_size;
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extern uint64_t ia64_lapic_address;
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#define LID_SAPIC_ID(x) ((int)((x) >> 24) & 0xff)
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@ -93,7 +91,7 @@ ia64_ap_startup(void)
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ia64_set_k4((intptr_t)pcpup);
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__asm __volatile("mov cr.pta=%0;; srlz.i;;" ::
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"r" (ap_vhpt + (1<<8) + (vhpt_size<<2) + 1));
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"r" (ap_vhpt + (1<<8) + (pmap_vhpt_log2size<<2) + 1));
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ap_awake = 1;
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ap_delay = 0;
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@ -248,7 +246,7 @@ cpu_mp_start()
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ap_pcpu = pc;
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ap_stack = malloc(KSTACK_PAGES * PAGE_SIZE, M_PMAP,
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M_WAITOK);
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ap_vhpt = vhpt_base[pc->pc_cpuid];
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ap_vhpt = pmap_vhpt_base[pc->pc_cpuid];
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ap_delay = 2000;
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ap_awake = 0;
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@ -148,22 +148,21 @@ MALLOC_DEFINE(M_PMAP, "PMAP", "PMAP Structures");
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#define pmap_set_wired(lpte) (lpte)->pte |= PTE_WIRED
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/*
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* Statically allocated kernel pmap
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* The VHPT bucket head structure.
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*/
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struct pmap kernel_pmap_store;
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vm_offset_t virtual_avail; /* VA of first avail page (after kernel bss) */
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vm_offset_t virtual_end; /* VA of last avail page (end of kernel AS) */
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struct ia64_bucket {
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uint64_t chain;
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struct mtx mutex;
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u_int length;
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};
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struct ia64_bucket *vhpt_bucket;
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uint64_t vhpt_base[MAXCPU];
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size_t vhpt_size;
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/*
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* Statically allocated kernel pmap
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*/
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struct pmap kernel_pmap_store;
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vm_offset_t virtual_avail; /* VA of first avail page (after kernel bss) */
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vm_offset_t virtual_end; /* VA of last avail page (end of kernel AS) */
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/*
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* Kernel virtual memory management.
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@ -209,16 +208,31 @@ int pmap_pagedaemon_waken;
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static uma_zone_t ptezone;
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/*
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* VHPT instrumentation.
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* Virtual Hash Page Table (VHPT) data.
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*/
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/* SYSCTL_DECL(_machdep); */
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SYSCTL_NODE(_machdep, OID_AUTO, vhpt, CTLFLAG_RD, 0, "");
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struct ia64_bucket *pmap_vhpt_bucket;
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int pmap_vhpt_nbuckets;
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SYSCTL_INT(_machdep_vhpt, OID_AUTO, nbuckets, CTLFLAG_RD,
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&pmap_vhpt_nbuckets, 0, "");
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uint64_t pmap_vhpt_base[MAXCPU];
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int pmap_vhpt_log2size = 0;
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TUNABLE_INT("machdep.vhpt.log2size", &pmap_vhpt_log2size);
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SYSCTL_INT(_machdep_vhpt, OID_AUTO, log2size, CTLFLAG_RD,
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&pmap_vhpt_log2size, 0, "");
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static int pmap_vhpt_inserts;
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static int pmap_vhpt_resident;
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SYSCTL_DECL(_vm_stats);
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SYSCTL_NODE(_vm_stats, OID_AUTO, vhpt, CTLFLAG_RD, 0, "");
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SYSCTL_INT(_vm_stats_vhpt, OID_AUTO, inserts, CTLFLAG_RD,
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&pmap_vhpt_inserts, 0, "");
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SYSCTL_INT(_vm_stats_vhpt, OID_AUTO, resident, CTLFLAG_RD,
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&pmap_vhpt_resident, 0, "");
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SYSCTL_INT(_machdep_vhpt, OID_AUTO, inserts, CTLFLAG_RD,
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&pmap_vhpt_inserts, 0, "");
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static int pmap_vhpt_population(SYSCTL_HANDLER_ARGS);
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SYSCTL_PROC(_machdep_vhpt, OID_AUTO, population, CTLTYPE_INT | CTLFLAG_RD,
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NULL, 0, pmap_vhpt_population, "I", "");
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static PMAP_INLINE void free_pv_entry(pv_entry_t pv);
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static pv_entry_t get_pv_entry(void);
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@ -353,17 +367,27 @@ pmap_bootstrap()
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* physical memory and try to locate a region which is large
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* enough to contain the VHPT (which must be a power of two in
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* size and aligned to a natural boundary).
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* We silently bump up the VHPT size to the minimum size if the
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* user has set the tunable too small. Likewise, the VHPT size
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* is silently capped to the maximum allowed.
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*/
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vhpt_size = 15;
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size = 1UL << vhpt_size;
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while (size < Maxmem * 32) {
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vhpt_size++;
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size <<= 1;
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}
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TUNABLE_INT_FETCH("machdep.vhpt.log2size", &pmap_vhpt_log2size);
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if (pmap_vhpt_log2size == 0) {
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pmap_vhpt_log2size = 15;
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size = 1UL << pmap_vhpt_log2size;
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while (size < Maxmem * 32) {
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pmap_vhpt_log2size++;
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size <<= 1;
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}
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} else if (pmap_vhpt_log2size < 15)
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pmap_vhpt_log2size = 15;
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if (pmap_vhpt_log2size > 61)
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pmap_vhpt_log2size = 61;
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vhpt_base[0] = 0;
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pmap_vhpt_base[0] = 0;
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base = limit = 0;
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while (vhpt_base[0] == 0) {
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size = 1UL << pmap_vhpt_log2size;
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while (pmap_vhpt_base[0] == 0) {
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if (bootverbose)
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printf("Trying VHPT size 0x%lx\n", size);
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for (i = 0; i < count; i += 2) {
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@ -377,12 +401,12 @@ pmap_bootstrap()
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}
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if (!phys_avail[i]) {
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/* Can't fit, try next smaller size. */
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vhpt_size--;
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pmap_vhpt_log2size--;
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size >>= 1;
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} else
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vhpt_base[0] = IA64_PHYS_TO_RR7(base);
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pmap_vhpt_base[0] = IA64_PHYS_TO_RR7(base);
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}
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if (vhpt_size < 15)
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if (pmap_vhpt_log2size < 15)
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panic("Can't find space for VHPT");
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if (bootverbose)
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@ -402,27 +426,29 @@ pmap_bootstrap()
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} else
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phys_avail[i] = limit;
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count = size / sizeof(struct ia64_lpte);
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pmap_vhpt_nbuckets = size / sizeof(struct ia64_lpte);
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vhpt_bucket = (void *)pmap_steal_memory(count * sizeof(struct ia64_bucket));
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pte = (struct ia64_lpte *)vhpt_base[0];
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for (i = 0; i < count; i++) {
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pmap_vhpt_bucket = (void *)pmap_steal_memory(pmap_vhpt_nbuckets *
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sizeof(struct ia64_bucket));
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pte = (struct ia64_lpte *)pmap_vhpt_base[0];
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for (i = 0; i < pmap_vhpt_nbuckets; i++) {
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pte[i].pte = 0;
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pte[i].itir = 0;
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pte[i].tag = 1UL << 63; /* Invalid tag */
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pte[i].chain = (uintptr_t)(vhpt_bucket + i);
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pte[i].chain = (uintptr_t)(pmap_vhpt_bucket + i);
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/* Stolen memory is zeroed! */
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mtx_init(&vhpt_bucket[i].mutex, "VHPT bucket lock", NULL,
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mtx_init(&pmap_vhpt_bucket[i].mutex, "VHPT bucket lock", NULL,
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MTX_SPIN);
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}
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for (i = 1; i < MAXCPU; i++) {
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vhpt_base[i] = vhpt_base[i - 1] + size;
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bcopy((void *)vhpt_base[i - 1], (void *)vhpt_base[i], size);
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pmap_vhpt_base[i] = pmap_vhpt_base[i - 1] + size;
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bcopy((void *)pmap_vhpt_base[i - 1], (void *)pmap_vhpt_base[i],
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size);
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}
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__asm __volatile("mov cr.pta=%0;; srlz.i;;" ::
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"r" (vhpt_base[0] + (1<<8) + (vhpt_size<<2) + 1));
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"r" (pmap_vhpt_base[0] + (1<<8) + (pmap_vhpt_log2size<<2) + 1));
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virtual_avail = VM_MIN_KERNEL_ADDRESS;
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virtual_end = VM_MAX_KERNEL_ADDRESS;
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@ -460,6 +486,19 @@ pmap_bootstrap()
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map_gateway_page();
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}
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static int
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pmap_vhpt_population(SYSCTL_HANDLER_ARGS)
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{
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int count, error, i;
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count = 0;
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for (i = 0; i < pmap_vhpt_nbuckets; i++)
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count += pmap_vhpt_bucket[i].length;
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error = SYSCTL_OUT(req, &count, sizeof(count));
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return (error);
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}
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/*
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* Initialize a vm_page's machine-dependent fields.
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*/
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@ -568,10 +607,10 @@ pmap_invalidate_page(pmap_t pmap, vm_offset_t va)
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KASSERT((pmap == kernel_pmap || pmap == PCPU_GET(current_pmap)),
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("invalidating TLB for non-current pmap"));
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vhpt_ofs = ia64_thash(va) - vhpt_base[PCPU_GET(cpuid)];
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vhpt_ofs = ia64_thash(va) - pmap_vhpt_base[PCPU_GET(cpuid)];
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critical_enter();
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for (i = 0; i < MAXCPU; i++) {
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pte = (struct ia64_lpte *)(vhpt_base[i] + vhpt_ofs);
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pte = (struct ia64_lpte *)(pmap_vhpt_base[i] + vhpt_ofs);
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if (pte->tag == ia64_ttag(va))
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pte->tag = 1UL << 63;
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}
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@ -799,9 +838,10 @@ pmap_enter_vhpt(struct ia64_lpte *pte, vm_offset_t va)
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{
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struct ia64_bucket *bckt;
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struct ia64_lpte *vhpte;
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uint64_t pte_pa;
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pmap_vhpt_inserts++;
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pmap_vhpt_resident++;
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/* Can fault, so get it out of the way. */
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pte_pa = ia64_tpa((vm_offset_t)pte);
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vhpte = (struct ia64_lpte *)ia64_thash(va);
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bckt = (struct ia64_bucket *)vhpte->chain;
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@ -809,9 +849,9 @@ pmap_enter_vhpt(struct ia64_lpte *pte, vm_offset_t va)
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mtx_lock_spin(&bckt->mutex);
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pte->chain = bckt->chain;
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ia64_mf();
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bckt->chain = ia64_tpa((vm_offset_t)pte);
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ia64_mf();
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bckt->chain = pte_pa;
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pmap_vhpt_inserts++;
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bckt->length++;
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mtx_unlock_spin(&bckt->mutex);
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}
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@ -856,7 +896,6 @@ pmap_remove_vhpt(vm_offset_t va)
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bckt->length--;
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mtx_unlock_spin(&bckt->mutex);
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pmap_vhpt_resident--;
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return (0);
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}
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@ -115,6 +115,9 @@ extern vm_offset_t phys_avail[];
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extern vm_offset_t virtual_avail;
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extern vm_offset_t virtual_end;
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extern uint64_t pmap_vhpt_base[];
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extern int pmap_vhpt_log2size;
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#define pmap_page_is_mapped(m) (!TAILQ_EMPTY(&(m)->md.pv_list))
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vm_offset_t pmap_steal_memory(vm_size_t);
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