Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261798AbUDVH3U (ORCPT ); Thu, 22 Apr 2004 03:29:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263825AbUDVH3K (ORCPT ); Thu, 22 Apr 2004 03:29:10 -0400 Received: from mtvcafw.sgi.com ([192.48.171.6]:42602 "EHLO omx3.sgi.com") by vger.kernel.org with ESMTP id S261798AbUDVHYx (ORCPT ); Thu, 22 Apr 2004 03:24:53 -0400 Date: Thu, 22 Apr 2004 00:07:18 -0700 From: Paul Jackson To: Paul Jackson Cc: colpatch@us.ibm.com, wli@holomorphy.com, rusty@rustcorp.com.au, linux-kernel@vger.kernel.org Subject: [Patch 7 of 17] cpumask v4 - Rewrite cpumask.h to use bitmap directly. Message-Id: <20040422000718.1823f5d5.pj@sgi.com> In-Reply-To: <20040421232247.22ffe1f2.pj@sgi.com> References: <20040421232247.22ffe1f2.pj@sgi.com> Organization: SGI X-Mailer: Sylpheed version 0.9.8 (GTK+ 1.2.10; i686-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 13769 Lines: 410 mask7-new-cpumask-h - Rewrite cpumask.h to use bitmap directly. Major rewrite of cpumask to use a single implementation, as a struct-wrapped bitmap. This patch leaves some 26 include/asm-*/cpumask*.h header files orphaned - to be removed next patch. Some nine cpumask macros for const variants and to coerce and promote between an unsigned long and a cpumask are obsolete. Simple emulation wrappers are provided in this patch, which can be removed once each of the 3 archs (i386, ppc64, x86_64) using them are recoded in follow-on patches to not need them. The CPU_MASK_ALL macro now avoids leaving possible garbage one bits in any unused portion of the high word. An improved comment lists all available operators, for convenient browsing. Index: 2.6.5.bitmap.v4/include/linux/cpumask.h =================================================================== --- 2.6.5.bitmap.v4.orig/include/linux/cpumask.h 2004-04-21 06:50:41.000000000 -0700 +++ 2.6.5.bitmap.v4/include/linux/cpumask.h 2004-04-21 16:45:03.000000000 -0700 @@ -1,44 +1,330 @@ #ifndef __LINUX_CPUMASK_H #define __LINUX_CPUMASK_H +/* + * Cpumasks provide a bitmap suitable for representing the + * set of CPU's in a system, one bit position per CPU number. + * + * See detailed comments in the file linux/bitmap.h describing the + * data type on which these cpumasks are based. + * + * For details of cpumask_scnprintf() and cpumask_parse(), + * see bitmap_scnprintf() and bitmap_parse() in lib/bitmap.c. + * + * The available cpumask operations are: + * + * void cpu_set(cpu, mask) turn on bit 'cpu' in mask + * void cpu_clear(cpu, mask) turn off bit 'cpu' in mask + * void cpus_setall(mask) set all bits + * void cpus_clear(mask) clear all bits + * int cpu_isset(cpu, mask) true iff bit 'cpu' set in mask + * int cpu_test_and_set(cpu, mask) test and set bit 'cpu' in mask + * + * void cpus_and(dst, src1, src2) dst = src1 & src2 [intersection] + * void cpus_or(dst, src1, src2) dst = src1 | src2 [union] + * void cpus_xor(dst, src1, src2) dst = src1 ^ src2 + * void cpus_andnot(dst, src1, src2) dst = src1 & ~src2 + * void cpus_complement(dst, src) dst = ~src + * + * int cpus_equal(mask1, mask2) Does mask1 == mask2? + * int cpus_intersects(mask1, mask2) Do mask1 and mask2 intersect? + * int cpus_subset(mask1, mask2) Is mask1 a subset of mask2? + * int cpus_empty(mask) Is mask empty (no bits sets)? + * int cpus_full(mask) Is mask full (all bits sets)? + * int cpus_weight(mask) Hamming weigh - number of set bits + * + * void cpus_shift_right(dst, src, n) Shift right + * void cpus_shift_left(dst, src, n) Shift left + * + * int first_cpu(mask) Number lowest set bit, or NR_CPUS + * int next_cpu(cpu, mask) Next cpu past 'cpu', or NR_CPUS + * + * cpumask_t cpumask_of_cpu(cpu) Return cpumask with bit 'cpu' set + * CPU_MASK_ALL Initializer - all bits set + * CPU_MASK_NONE Initializer - no bits set + * unsigned long *cpus_addr(mask) Array of unsigned long's in mask + * + * int cpumask_scnprintf(buf, len, mask) Format cpumask for printing + * int cpumask_parse(ubuf, ulen, mask) Parse ascii string as cpumask + * + * int num_online_cpus() Number of online CPUs + * int num_possible_cpus() Number of all possible CPUs + * int cpu_online(cpu) Is some cpu online? + * int cpu_possible(cpu) Is some cpu possible? + * void cpu_set_online(cpu) set cpu in cpu_online_map + * void cpu_set_offline(cpu) clear cpu in cpu_online_map + * int any_online_cpu(mask) First online cpu in mask + * + * for_each_cpu_mask(cpu, mask) for-loop cpu over mask + * for_each_cpu(cpu) for-loop cpu over cpu_possible_map + * for_each_online_cpu(cpu) for-loop cpu over cpu_online_map + */ + #include #include -#include #include -#ifdef CONFIG_SMP +typedef struct { DECLARE_BITMAP(bits, NR_CPUS); } cpumask_t; +extern cpumask_t _unused_cpumask_arg_; -extern cpumask_t cpu_online_map; -extern cpumask_t cpu_possible_map; +#define cpu_set(cpu, dst) __cpu_set((cpu), &(dst)) +static inline void __cpu_set(int cpu, volatile cpumask_t *dstp) +{ + if (cpu < NR_CPUS) + set_bit(cpu, dstp->bits); +} + +#define cpu_clear(cpu, dst) __cpu_clear((cpu), &(dst)) +static inline void __cpu_clear(int cpu, volatile cpumask_t *dstp) +{ + clear_bit(cpu, dstp->bits); +} + +#define cpus_setall(dst) __cpus_setall(&(dst), NR_CPUS) +static inline void __cpus_setall(cpumask_t *dstp, int nbits) +{ + bitmap_fill(dstp->bits, nbits); +} + +#define cpus_clear(dst) __cpus_clear(&(dst), NR_CPUS) +static inline void __cpus_clear(cpumask_t *dstp, int nbits) +{ + bitmap_clear(dstp->bits, nbits); +} + +#define cpu_isset(cpu, cpumask) __cpu_isset((cpu), &(cpumask)) +static inline int __cpu_isset(int cpu, const volatile cpumask_t *addr) +{ + return test_bit(cpu, addr->bits); +} + +#define cpu_test_and_set(cpu, cpumask) __cpu_test_and_set((cpu), &(cpumask)) +static inline int __cpu_test_and_set(int cpu, cpumask_t *addr) +{ + if (cpu < NR_CPUS) + return test_and_set_bit(cpu, addr->bits); + else + return 0; +} + +#define cpus_and(dst, src1, src2) __cpus_and(&(dst), &(src1), &(src2), NR_CPUS) +static inline void __cpus_and(cpumask_t *dstp, cpumask_t *src1p, + cpumask_t *src2p, int nbits) +{ + bitmap_and(dstp->bits, src1p->bits, src2p->bits, nbits); +} + +#define cpus_or(dst, src1, src2) __cpus_or(&(dst), &(src1), &(src2), NR_CPUS) +static inline void __cpus_or(cpumask_t *dstp, cpumask_t *src1p, + cpumask_t *src2p, int nbits) +{ + bitmap_or(dstp->bits, src1p->bits, src2p->bits, nbits); +} + +#define cpus_xor(dst, src1, src2) __cpus_xor(&(dst), &(src1), &(src2), NR_CPUS) +static inline void __cpus_xor(cpumask_t *dstp, cpumask_t *src1p, + cpumask_t *src2p, int nbits) +{ + bitmap_xor(dstp->bits, src1p->bits, src2p->bits, nbits); +} + +#define cpus_andnot(dst, src1, src2) \ + __cpus_andnot(&(dst), &(src1), &(src2), NR_CPUS) +static inline void __cpus_andnot(cpumask_t *dstp, cpumask_t *src1p, + cpumask_t *src2p, int nbits) +{ + bitmap_andnot(dstp->bits, src1p->bits, src2p->bits, nbits); +} + +#define cpus_complement(dst, src) __cpus_complement(&(dst), &(src), NR_CPUS) +static inline void __cpus_complement(cpumask_t *dstp, + cpumask_t *srcp, int nbits) +{ + bitmap_complement(dstp->bits, srcp->bits, nbits); +} + +#define cpus_equal(src1, src2) __cpus_equal(&(src1), &(src2), NR_CPUS) +static inline int __cpus_equal(cpumask_t *src1p, + cpumask_t *src2p, int nbits) +{ + return bitmap_equal(src1p->bits, src2p->bits, nbits); +} + +#define cpus_intersects(src1, src2) __cpus_intersects(&(src1), &(src2), NR_CPUS) +static inline int __cpus_intersects(cpumask_t *src1p, + cpumask_t *src2p, int nbits) +{ + return bitmap_intersects(src1p->bits, src2p->bits, nbits); +} + +#define cpus_subset(src1, src2) __cpus_subset(&(src1), &(src2), NR_CPUS) +static inline int __cpus_subset(cpumask_t *src1p, + cpumask_t *src2p, int nbits) +{ + return bitmap_subset(src1p->bits, src2p->bits, nbits); +} + +#define cpus_empty(src) __cpus_empty(&(src), NR_CPUS) +static inline int __cpus_empty(cpumask_t *srcp, int nbits) +{ + return bitmap_empty(srcp->bits, nbits); +} + +#define cpus_full(cpumask) __cpus_full(&(cpumask), NR_CPUS) +static inline int __cpus_full(cpumask_t *srcp, int nbits) +{ + return bitmap_full(srcp->bits, nbits); +} + +#define cpus_weight(cpumask) __cpus_weight(&(cpumask), NR_CPUS) +static inline int __cpus_weight(cpumask_t *srcp, int nbits) +{ + return bitmap_weight(srcp->bits, nbits); +} + +#define cpus_shift_right(dst, src, n) \ + __cpus_shift_right(&(dst), &(src), (n), NR_CPUS) +static inline void __cpus_shift_right(cpumask_t *dstp, + cpumask_t *srcp, int n, int nbits) +{ + bitmap_shift_right(dstp->bits, srcp->bits, n, nbits); +} + +#define cpus_shift_left(dst, src, n) \ + __cpus_shift_left(&(dst), &(src), (n), NR_CPUS) +static inline void __cpus_shift_left(cpumask_t *dstp, + cpumask_t *srcp, int n, int nbits) +{ + bitmap_shift_left(dstp->bits, srcp->bits, n, nbits); +} + +#define first_cpu(src) __first_cpu(&(src), NR_CPUS) +static inline int __first_cpu(cpumask_t *srcp, int nbits) +{ + return find_first_bit(srcp->bits, nbits); +} -#define num_online_cpus() cpus_weight(cpu_online_map) -#define num_possible_cpus() cpus_weight(cpu_possible_map) -#define cpu_online(cpu) cpu_isset(cpu, cpu_online_map) -#define cpu_possible(cpu) cpu_isset(cpu, cpu_possible_map) - -#define for_each_cpu_mask(cpu, mask) \ - for (cpu = first_cpu_const(mk_cpumask_const(mask)); \ - cpu < NR_CPUS; \ - cpu = next_cpu_const(cpu, mk_cpumask_const(mask))) +#define next_cpu(n, src) __next_cpu((n), &(src), NR_CPUS) +static inline int __next_cpu(int n, cpumask_t *srcp, int nbits) +{ + return find_next_bit(srcp->bits, nbits, n+1); +} + +#define cpumask_of_cpu(cpu) \ +({ \ + typeof(_unused_cpumask_arg_) m; \ + int c = cpu; \ + if (sizeof(m) == sizeof(unsigned long)) { \ + if (c < NR_CPUS) \ + m.bits[0] = 1UL<bits, nbits); +} + +#define cpumask_parse(ubuf, ulen, src) \ + __cpumask_parse((ubuf), (ulen), &(src), NR_CPUS) +static inline int __cpumask_parse(const char __user *buf, int len, + cpumask_t *srcp, int nbits) +{ + return bitmap_parse(buf, len, srcp->bits, nbits); +} + +/* + * The following particular system cpumasks and operations + * on them manage all (possible) and online cpus. + */ + +extern cpumask_t cpu_online_map; +extern cpumask_t cpu_possible_map; + +#ifdef CONFIG_SMP + +#define num_online_cpus() cpus_weight(cpu_online_map) +#define num_possible_cpus() cpus_weight(cpu_possible_map) +#define cpu_online(cpu) cpu_isset((cpu), cpu_online_map) +#define cpu_possible(cpu) cpu_isset((cpu), cpu_possible_map) +#define cpu_set_online(cpu) cpu_set((cpu), cpu_online_map) +#define cpu_set_offline(cpu) cpu_clear((cpu), cpu_online_map) + +#define any_online_cpu(mask) \ +({ \ + cpumask_t m; \ + cpus_and(m, mask, cpu_online_map); \ + first_cpu(m); \ +}) + +#define for_each_cpu_mask(cpu, mask) \ + for (cpu = first_cpu(mask); \ + cpu < NR_CPUS; \ + cpu = next_cpu(cpu, mask)) + +#else /* !CONFIG_SMP */ + +#define num_online_cpus() 1 +#define num_possible_cpus() 1 +#define cpu_online(cpu) ({ BUG_ON((cpu) != 0); 1; }) +#define cpu_possible(cpu) ({ BUG_ON((cpu) != 0); 1; }) +#define cpu_set_online(cpu) ({ BUG_ON((cpu) != 0); }) +#define cpu_set_offline(cpu) ({ BUG(); }) + +#define any_online_cpu(mask) 0 + +#define for_each_cpu_mask(cpu, mask) for (cpu = 0; cpu < 1; cpu++) + +#endif /* CONFIG_SMP */ + +#define for_each_cpu(cpu) \ + for_each_cpu_mask(cpu, cpu_possible_map) +#define for_each_online_cpu(cpu) \ + for_each_cpu_mask(cpu, cpu_online_map) -#define cpumask_parse(buf, buflen, map) \ - bitmap_parse(buf, buflen, cpus_addr(map), NR_CPUS) +/* Begin obsolete cpumask operator emulation */ +#define cpu_isset_const(a,b) cpu_isset(a,b) +#define cpumask_const_t cpumask_t +#define cpus_coerce(m) (cpus_addr(m)[0]) +#define cpus_coerce_const cpus_coerce +#define cpus_promote(x) ({ cpumask_t m; m.bits[0] = x; m; }) +#define cpus_weight_const cpus_weight +#define first_cpu_const first_cpu +#define mk_cpumask_const(x) x +#define next_cpu_const next_cpu +/* End of obsolete cpumask operator emulation */ #endif /* __LINUX_CPUMASK_H */ Index: 2.6.5.bitmap.v4/kernel/sched.c =================================================================== --- 2.6.5.bitmap.v4.orig/kernel/sched.c 2004-04-21 06:50:45.000000000 -0700 +++ 2.6.5.bitmap.v4/kernel/sched.c 2004-04-21 16:45:03.000000000 -0700 @@ -2349,6 +2349,11 @@ return retval; } +#ifndef CONFIG_SMP +cpumask_t cpu_online_map = CPU_MASK_ALL; +cpumask_t cpu_possible_map = CPU_MASK_ALL; +#endif + /** * sys_sched_getaffinity - get the cpu affinity of a process * @pid: pid of the process -- I won't rest till it's the best ... Programmer, Linux Scalability Paul Jackson 1.650.933.1373 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/