diff options
Diffstat (limited to 'include/linux/cpumask.h')
| -rw-r--r-- | include/linux/cpumask.h | 125 |
1 files changed, 70 insertions, 55 deletions
diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h index 10c92bd9b807..8fbe76607965 100644 --- a/include/linux/cpumask.h +++ b/include/linux/cpumask.h @@ -50,8 +50,41 @@ static inline void set_nr_cpu_ids(unsigned int nr) #endif } -/* Deprecated. Always use nr_cpu_ids. */ -#define nr_cpumask_bits nr_cpu_ids +/* + * We have several different "preferred sizes" for the cpumask + * operations, depending on operation. + * + * For example, the bitmap scanning and operating operations have + * optimized routines that work for the single-word case, but only when + * the size is constant. So if NR_CPUS fits in one single word, we are + * better off using that small constant, in order to trigger the + * optimized bit finding. That is 'small_cpumask_size'. + * + * The clearing and copying operations will similarly perform better + * with a constant size, but we limit that size arbitrarily to four + * words. We call this 'large_cpumask_size'. + * + * Finally, some operations just want the exact limit, either because + * they set bits or just don't have any faster fixed-sized versions. We + * call this just 'nr_cpumask_size'. + * + * Note that these optional constants are always guaranteed to be at + * least as big as 'nr_cpu_ids' itself is, and all our cpumask + * allocations are at least that size (see cpumask_size()). The + * optimization comes from being able to potentially use a compile-time + * constant instead of a run-time generated exact number of CPUs. + */ +#if NR_CPUS <= BITS_PER_LONG + #define small_cpumask_bits ((unsigned int)NR_CPUS) + #define large_cpumask_bits ((unsigned int)NR_CPUS) +#elif NR_CPUS <= 4*BITS_PER_LONG + #define small_cpumask_bits nr_cpu_ids + #define large_cpumask_bits ((unsigned int)NR_CPUS) +#else + #define small_cpumask_bits nr_cpu_ids + #define large_cpumask_bits nr_cpu_ids +#endif +#define nr_cpumask_bits nr_cpu_ids /* * The following particular system cpumasks and operations manage @@ -126,7 +159,7 @@ static __always_inline unsigned int cpumask_check(unsigned int cpu) */ static inline unsigned int cpumask_first(const struct cpumask *srcp) { - return find_first_bit(cpumask_bits(srcp), nr_cpumask_bits); + return find_first_bit(cpumask_bits(srcp), small_cpumask_bits); } /** @@ -137,7 +170,7 @@ static inline unsigned int cpumask_first(const struct cpumask *srcp) */ static inline unsigned int cpumask_first_zero(const struct cpumask *srcp) { - return find_first_zero_bit(cpumask_bits(srcp), nr_cpumask_bits); + return find_first_zero_bit(cpumask_bits(srcp), small_cpumask_bits); } /** @@ -150,7 +183,7 @@ static inline unsigned int cpumask_first_zero(const struct cpumask *srcp) static inline unsigned int cpumask_first_and(const struct cpumask *srcp1, const struct cpumask *srcp2) { - return find_first_and_bit(cpumask_bits(srcp1), cpumask_bits(srcp2), nr_cpumask_bits); + return find_first_and_bit(cpumask_bits(srcp1), cpumask_bits(srcp2), small_cpumask_bits); } /** @@ -161,7 +194,7 @@ unsigned int cpumask_first_and(const struct cpumask *srcp1, const struct cpumask */ static inline unsigned int cpumask_last(const struct cpumask *srcp) { - return find_last_bit(cpumask_bits(srcp), nr_cpumask_bits); + return find_last_bit(cpumask_bits(srcp), small_cpumask_bits); } /** @@ -177,7 +210,7 @@ unsigned int cpumask_next(int n, const struct cpumask *srcp) /* -1 is a legal arg here. */ if (n != -1) cpumask_check(n); - return find_next_bit(cpumask_bits(srcp), nr_cpumask_bits, n + 1); + return find_next_bit(cpumask_bits(srcp), small_cpumask_bits, n + 1); } /** @@ -192,7 +225,7 @@ static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp) /* -1 is a legal arg here. */ if (n != -1) cpumask_check(n); - return find_next_zero_bit(cpumask_bits(srcp), nr_cpumask_bits, n+1); + return find_next_zero_bit(cpumask_bits(srcp), small_cpumask_bits, n+1); } #if NR_CPUS == 1 @@ -235,7 +268,7 @@ unsigned int cpumask_next_and(int n, const struct cpumask *src1p, if (n != -1) cpumask_check(n); return find_next_and_bit(cpumask_bits(src1p), cpumask_bits(src2p), - nr_cpumask_bits, n + 1); + small_cpumask_bits, n + 1); } /** @@ -246,17 +279,7 @@ unsigned int cpumask_next_and(int n, const struct cpumask *src1p, * After the loop, cpu is >= nr_cpu_ids. */ #define for_each_cpu(cpu, mask) \ - for_each_set_bit(cpu, cpumask_bits(mask), nr_cpumask_bits) - -/** - * for_each_cpu_not - iterate over every cpu in a complemented mask - * @cpu: the (optionally unsigned) integer iterator - * @mask: the cpumask pointer - * - * After the loop, cpu is >= nr_cpu_ids. - */ -#define for_each_cpu_not(cpu, mask) \ - for_each_clear_bit(cpu, cpumask_bits(mask), nr_cpumask_bits) + for_each_set_bit(cpu, cpumask_bits(mask), small_cpumask_bits) #if NR_CPUS == 1 static inline @@ -290,7 +313,7 @@ unsigned int __pure cpumask_next_wrap(int n, const struct cpumask *mask, int sta * After the loop, cpu is >= nr_cpu_ids. */ #define for_each_cpu_wrap(cpu, mask, start) \ - for_each_set_bit_wrap(cpu, cpumask_bits(mask), nr_cpumask_bits, start) + for_each_set_bit_wrap(cpu, cpumask_bits(mask), small_cpumask_bits, start) /** * for_each_cpu_and - iterate over every cpu in both masks @@ -307,7 +330,7 @@ unsigned int __pure cpumask_next_wrap(int n, const struct cpumask *mask, int sta * After the loop, cpu is >= nr_cpu_ids. */ #define for_each_cpu_and(cpu, mask1, mask2) \ - for_each_and_bit(cpu, cpumask_bits(mask1), cpumask_bits(mask2), nr_cpumask_bits) + for_each_and_bit(cpu, cpumask_bits(mask1), cpumask_bits(mask2), small_cpumask_bits) /** * for_each_cpu_andnot - iterate over every cpu present in one mask, excluding @@ -325,7 +348,7 @@ unsigned int __pure cpumask_next_wrap(int n, const struct cpumask *mask, int sta * After the loop, cpu is >= nr_cpu_ids. */ #define for_each_cpu_andnot(cpu, mask1, mask2) \ - for_each_andnot_bit(cpu, cpumask_bits(mask1), cpumask_bits(mask2), nr_cpumask_bits) + for_each_andnot_bit(cpu, cpumask_bits(mask1), cpumask_bits(mask2), small_cpumask_bits) /** * cpumask_any_but - return a "random" in a cpumask, but not this one. @@ -356,7 +379,7 @@ unsigned int cpumask_any_but(const struct cpumask *mask, unsigned int cpu) */ static inline unsigned int cpumask_nth(unsigned int cpu, const struct cpumask *srcp) { - return find_nth_bit(cpumask_bits(srcp), nr_cpumask_bits, cpumask_check(cpu)); + return find_nth_bit(cpumask_bits(srcp), small_cpumask_bits, cpumask_check(cpu)); } /** @@ -372,7 +395,7 @@ unsigned int cpumask_nth_and(unsigned int cpu, const struct cpumask *srcp1, const struct cpumask *srcp2) { return find_nth_and_bit(cpumask_bits(srcp1), cpumask_bits(srcp2), - nr_cpumask_bits, cpumask_check(cpu)); + small_cpumask_bits, cpumask_check(cpu)); } /** @@ -388,7 +411,7 @@ unsigned int cpumask_nth_andnot(unsigned int cpu, const struct cpumask *srcp1, const struct cpumask *srcp2) { return find_nth_andnot_bit(cpumask_bits(srcp1), cpumask_bits(srcp2), - nr_cpumask_bits, cpumask_check(cpu)); + small_cpumask_bits, cpumask_check(cpu)); } /** @@ -408,7 +431,7 @@ unsigned int cpumask_nth_and_andnot(unsigned int cpu, const struct cpumask *srcp return find_nth_and_andnot_bit(cpumask_bits(srcp1), cpumask_bits(srcp2), cpumask_bits(srcp3), - nr_cpumask_bits, cpumask_check(cpu)); + small_cpumask_bits, cpumask_check(cpu)); } #define CPU_BITS_NONE \ @@ -495,10 +518,14 @@ static __always_inline bool cpumask_test_and_clear_cpu(int cpu, struct cpumask * /** * cpumask_setall - set all cpus (< nr_cpu_ids) in a cpumask * @dstp: the cpumask pointer + * + * Note: since we set bits, we should use the tighter 'bitmap_set()' with + * the eact number of bits, not 'bitmap_fill()' that will fill past the + * end. */ static inline void cpumask_setall(struct cpumask *dstp) { - bitmap_fill(cpumask_bits(dstp), nr_cpumask_bits); + bitmap_set(cpumask_bits(dstp), 0, nr_cpumask_bits); } /** @@ -507,7 +534,7 @@ static inline void cpumask_setall(struct cpumask *dstp) */ static inline void cpumask_clear(struct cpumask *dstp) { - bitmap_zero(cpumask_bits(dstp), nr_cpumask_bits); + bitmap_zero(cpumask_bits(dstp), large_cpumask_bits); } /** @@ -523,7 +550,7 @@ static inline bool cpumask_and(struct cpumask *dstp, const struct cpumask *src2p) { return bitmap_and(cpumask_bits(dstp), cpumask_bits(src1p), - cpumask_bits(src2p), nr_cpumask_bits); + cpumask_bits(src2p), small_cpumask_bits); } /** @@ -536,7 +563,7 @@ static inline void cpumask_or(struct cpumask *dstp, const struct cpumask *src1p, const struct cpumask *src2p) { bitmap_or(cpumask_bits(dstp), cpumask_bits(src1p), - cpumask_bits(src2p), nr_cpumask_bits); + cpumask_bits(src2p), small_cpumask_bits); } /** @@ -550,7 +577,7 @@ static inline void cpumask_xor(struct cpumask *dstp, const struct cpumask *src2p) { bitmap_xor(cpumask_bits(dstp), cpumask_bits(src1p), - cpumask_bits(src2p), nr_cpumask_bits); + cpumask_bits(src2p), small_cpumask_bits); } /** @@ -566,19 +593,7 @@ static inline bool cpumask_andnot(struct cpumask *dstp, const struct cpumask *src2p) { return bitmap_andnot(cpumask_bits(dstp), cpumask_bits(src1p), - cpumask_bits(src2p), nr_cpumask_bits); -} - -/** - * cpumask_complement - *dstp = ~*srcp - * @dstp: the cpumask result - * @srcp: the input to invert - */ -static inline void cpumask_complement(struct cpumask *dstp, - const struct cpumask *srcp) -{ - bitmap_complement(cpumask_bits(dstp), cpumask_bits(srcp), - nr_cpumask_bits); + cpumask_bits(src2p), small_cpumask_bits); } /** @@ -590,7 +605,7 @@ static inline bool cpumask_equal(const struct cpumask *src1p, const struct cpumask *src2p) { return bitmap_equal(cpumask_bits(src1p), cpumask_bits(src2p), - nr_cpumask_bits); + small_cpumask_bits); } /** @@ -604,7 +619,7 @@ static inline bool cpumask_or_equal(const struct cpumask *src1p, const struct cpumask *src3p) { return bitmap_or_equal(cpumask_bits(src1p), cpumask_bits(src2p), - cpumask_bits(src3p), nr_cpumask_bits); + cpumask_bits(src3p), small_cpumask_bits); } /** @@ -616,7 +631,7 @@ static inline bool cpumask_intersects(const struct cpumask *src1p, const struct cpumask *src2p) { return bitmap_intersects(cpumask_bits(src1p), cpumask_bits(src2p), - nr_cpumask_bits); + small_cpumask_bits); } /** @@ -630,7 +645,7 @@ static inline bool cpumask_subset(const struct cpumask *src1p, const struct cpumask *src2p) { return bitmap_subset(cpumask_bits(src1p), cpumask_bits(src2p), - nr_cpumask_bits); + small_cpumask_bits); } /** @@ -639,7 +654,7 @@ static inline bool cpumask_subset(const struct cpumask *src1p, */ static inline bool cpumask_empty(const struct cpumask *srcp) { - return bitmap_empty(cpumask_bits(srcp), nr_cpumask_bits); + return bitmap_empty(cpumask_bits(srcp), small_cpumask_bits); } /** @@ -657,7 +672,7 @@ static inline bool cpumask_full(const struct cpumask *srcp) */ static inline unsigned int cpumask_weight(const struct cpumask *srcp) { - return bitmap_weight(cpumask_bits(srcp), nr_cpumask_bits); + return bitmap_weight(cpumask_bits(srcp), small_cpumask_bits); } /** @@ -668,7 +683,7 @@ static inline unsigned int cpumask_weight(const struct cpumask *srcp) static inline unsigned int cpumask_weight_and(const struct cpumask *srcp1, const struct cpumask *srcp2) { - return bitmap_weight_and(cpumask_bits(srcp1), cpumask_bits(srcp2), nr_cpumask_bits); + return bitmap_weight_and(cpumask_bits(srcp1), cpumask_bits(srcp2), small_cpumask_bits); } /** @@ -681,7 +696,7 @@ static inline void cpumask_shift_right(struct cpumask *dstp, const struct cpumask *srcp, int n) { bitmap_shift_right(cpumask_bits(dstp), cpumask_bits(srcp), n, - nr_cpumask_bits); + small_cpumask_bits); } /** @@ -705,7 +720,7 @@ static inline void cpumask_shift_left(struct cpumask *dstp, static inline void cpumask_copy(struct cpumask *dstp, const struct cpumask *srcp) { - bitmap_copy(cpumask_bits(dstp), cpumask_bits(srcp), nr_cpumask_bits); + bitmap_copy(cpumask_bits(dstp), cpumask_bits(srcp), large_cpumask_bits); } /** @@ -789,7 +804,7 @@ static inline int cpulist_parse(const char *buf, struct cpumask *dstp) */ static inline unsigned int cpumask_size(void) { - return BITS_TO_LONGS(nr_cpumask_bits) * sizeof(long); + return BITS_TO_LONGS(large_cpumask_bits) * sizeof(long); } /* |