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[IA64] Use bitmaps for efficient context allocation/free

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Corrects the very inefficent method of finding free context_ids in
get_mmu_context().  Instead of walking the task_list of all processes,
2 bitmaps are used to efficently store and lookup state, inuse and
needs flushing. The entire rid address space is now used before calling
wrap_mmu_context and global tlb flushing.

Special thanks to Ken and Rohit for their review and modifications in
using a bit flushmap.

Signed-off-by: Peter Keilty <peter.keilty@hp.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Peter Keilty 2005-10-31 16:44:47 -05:00 • committed by Tony Luck
parent f2c84c0e84
commit dcc17d1bae
4 changed files with 44 additions and 33 deletions
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include/asm-ia64/tlbflush.h
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@ -51,6 +51,7 @@ flush_tlb_mm (struct mm_struct *mm)
if (!mm)
return;
set_bit(mm->context, ia64_ctx.flushmap);
mm->context = 0;
if (atomic_read(&mm->mm_users) == 0)