ARM: 7925/1: mm: keep track of last ASID allocation to improve bitmap searching (a7a04105) · Commits · 戴 / test

Since we only clear entries in the ASID bitmap on a rollover event, the bitmap tends to consist of a block of consecutive set bits followed by a block of consecutive clear bits. The exception to this rule is for ASIDs which have been carried over from a previous generation, but these are bound by the number of CPUs. This patch optimises our bitmap searching strategy, so that we search from the last successful allocation, rather than search from index 1 each time we allocate a new ASID. Reviewed-by:

Catalin Marinas <catalin.marinas@arm.com> Signed-off-by:

Will Deacon <will.deacon@arm.com> Signed-off-by:

Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mm/context.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -180,6 +180,7 @@ static int is_reserved_asid(u64 asid)

		static u64 new_context(struct mm_struct *mm, unsigned int cpu)
		{
		static u32 cur_idx = 1;
		u64 asid = atomic64_read(&mm->context.id);
		u64 generation = atomic64_read(&asid_generation);

		@@ -197,7 +198,7 @@ static u64 new_context(struct mm_struct *mm, unsigned int cpu)
		* as we reserve ASID #0 to switch via TTBR0 and indicate
		* rollover events.
		*/
		asid = find_next_zero_bit(asid_map, NUM_USER_ASIDS, 1);
		asid = find_next_zero_bit(asid_map, NUM_USER_ASIDS, cur_idx);
		if (asid == NUM_USER_ASIDS) {
		generation = atomic64_add_return(ASID_FIRST_VERSION,
		&asid_generation);
		@@ -205,6 +206,7 @@ static u64 new_context(struct mm_struct *mm, unsigned int cpu)
		asid = find_next_zero_bit(asid_map, NUM_USER_ASIDS, 1);
		}
		__set_bit(asid, asid_map);
		cur_idx = asid;
		asid \|= generation;
		cpumask_clear(mm_cpumask(mm));
		}

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