f54a093e81
- use struct vm_page_md for attaching pv entries to struct vm_page - change pseg_set()'s return value to indicate whether the spare page was used as an L2 or L3 PTP. - use a pool for pv entries instead of malloc(). - put PTPs on a list attached to the pmap so we can free them more efficiently (by just walking the list) in pmap_destroy(). - use the new pmap_remove_all() interface to avoid flushing the cache and TLB for each pmap_remove() that's done as we are tearing down an address space. - in pmap_enter(), handle replacing an existing mapping more efficiently than just calling pmap_remove() on it. also, skip flushing the TSB and TLB if there was no previous mapping, since there can't be anything we need to flush. also, preload the TSB if we're pre-setting the mod/ref bits. - allocate hardware contexts like the MIPS pmap: allocate them all sequentially without reuse, then once we run out just invalidate all user TLB entries and flush the entire L1 dcache. - fix pmap_extract() for the case where the va is not page-aligned and nothing is mapped there. - fix calculation of TSB size. it was comparing physmem (which is in units of pages) to constants that only make sense if they are in units of bytes. - avoid sleeping in pmap_enter(), instead let the caller do it. - use pmap_kenter_pa() instead of pmap_enter() where appropriate. - remove code to handle impossible cases in various functions. - tweak asm code to pipeline a little better. - remove many unnecessary spls and membars. - lots of code cleanup. - no doubt other stuff that I've forgotten. the result of all this is that a fork+exit microbenchmark is 34% faster and a fork+exec+exit microbenchmark is 28% faster. |
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