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97dbe5e48e
1. Add support for automatic promotion of 4KB page mappings to 2MB page mappings. Automatic promotion can be enabled by setting the tunable "vm.pmap.pg_ps_enabled" to a non-zero value. By default, automatic promotion is disabled. Tested by: kris 2. To date, we have assumed that the TLB will only set the PG_M bit in a PTE if that PTE has the PG_RW bit set. However, this assumption does not hold on recent processors from Intel. For example, consider a PTE that has the PG_RW bit set but the PG_M bit clear. Suppose this PTE is cached in the TLB and later the PG_RW bit is cleared in the PTE, but the corresponding TLB entry is not (yet) invalidated. Historically, upon a write access using this (stale) TLB entry, the TLB would observe that the PG_RW bit had been cleared and initiate a page fault, aborting the setting of the PG_M bit in the PTE. Now, however, P4- and Core2-family processors will set the PG_M bit before observing that the PG_RW bit is clear and initiating a page fault. In other words, the write does not occur but the PG_M bit is still set. The real impact of this difference is not that great. Specifically, we should no longer assert that any PTE with the PG_M bit set must also have the PG_RW bit set, and we should ignore the state of the PG_M bit unless the PG_RW bit is set. |
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| .. | ||
| apic_vector.s | ||
| atomic.c | ||
| autoconf.c | ||
| bios.c | ||
| bioscall.s | ||
| bpf_jit_machdep.c | ||
| bpf_jit_machdep.h | ||
| busdma_machdep.c | ||
| db_disasm.c | ||
| db_interface.c | ||
| db_trace.c | ||
| dump_machdep.c | ||
| elan-mmcr.c | ||
| elf_machdep.c | ||
| exception.s | ||
| gdb_machdep.c | ||
| genassym.c | ||
| geode.c | ||
| i686_mem.c | ||
| identcpu.c | ||
| in_cksum.c | ||
| initcpu.c | ||
| intr_machdep.c | ||
| io_apic.c | ||
| io.c | ||
| k6_mem.c | ||
| legacy.c | ||
| local_apic.c | ||
| locore.s | ||
| longrun.c | ||
| machdep.c | ||
| mem.c | ||
| minidump_machdep.c | ||
| mp_clock.c | ||
| mp_machdep.c | ||
| mp_watchdog.c | ||
| mpboot.s | ||
| mptable_pci.c | ||
| mptable.c | ||
| msi.c | ||
| nexus.c | ||
| perfmon.c | ||
| pmap.c | ||
| ptrace_machdep.c | ||
| stack_machdep.c | ||
| support.s | ||
| swtch.s | ||
| symbols.raw | ||
| sys_machdep.c | ||
| trap.c | ||
| tsc.c | ||
| uio_machdep.c | ||
| vm86.c | ||
| vm86bios.s | ||
| vm_machdep.c | ||