eeacb3b02f
The hold_count and wire_count fields of struct vm_page are separate reference counters with similar semantics. The remaining essential differences are that holds are not counted as a reference with respect to LRU, and holds have an implicit free-on-last unhold semantic whereas vm_page_unwire() callers must explicitly determine whether to free the page once the last reference to the page is released. This change removes the KPIs which directly manipulate hold_count. Functions such as vm_fault_quick_hold_pages() now return wired pages instead. Since r328977 the overhead of maintaining LRU for wired pages is lower, and in many cases vm_fault_quick_hold_pages() callers would swap holds for wirings on the returned pages anyway, so with this change we remove a number of page lock acquisitions. No functional change is intended. __FreeBSD_version is bumped. Reviewed by: alc, kib Discussed with: jeff Discussed with: jhb, np (cxgbe) Tested by: pho (previous version) Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D19247 |
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| .. | ||
| autoconf.c | ||
| bcopy.S | ||
| bus_space_generic.c | ||
| busdma_machdep.c | ||
| cache_mipsNN.c | ||
| cache.c | ||
| cpu.c | ||
| db_disasm.c | ||
| db_interface.c | ||
| db_trace.c | ||
| dump_machdep.c | ||
| elf_machdep.c | ||
| elf_trampoline.c | ||
| exception.S | ||
| fp.S | ||
| freebsd32_machdep.c | ||
| gdb_machdep.c | ||
| genassym.c | ||
| in_cksum.c | ||
| inckern.S | ||
| intr_machdep.c | ||
| libkern_machdep.c | ||
| locore.S | ||
| machdep.c | ||
| mem.c | ||
| minidump_machdep.c | ||
| mips_pic.c | ||
| mp_machdep.c | ||
| mpboot.S | ||
| nexus.c | ||
| octeon_cop2_swtch.S | ||
| octeon_cop2.c | ||
| ofw_machdep.c | ||
| pm_machdep.c | ||
| pmap.c | ||
| ptrace_machdep.c | ||
| sc_machdep.c | ||
| stack_machdep.c | ||
| stdatomic.c | ||
| support.S | ||
| swtch.S | ||
| sys_machdep.c | ||
| tick.c | ||
| tlb.c | ||
| trap.c | ||
| uio_machdep.c | ||
| uma_machdep.c | ||
| vm_machdep.c | ||