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Linux centos-s-1vcpu-2gb-sgp1-01 3.10.0-1160.108.1.el7.x86_64 #1 SMP Thu Jan 25 16:17:31 UTC 2024 x86_64
nginx/1.26.1
167.99.78.96

linux_hash.h

#ifndef _LINUX_HASH_H
#define _LINUX_HASH_H
/* Fast hashing routine for ints,  longs and pointers.
   (C) 2002 William Lee Irwin III, IBM */

/*
 * Knuth recommends primes in approximately golden ratio to the maximum
 * integer representable by a machine word for multiplicative hashing.
 * Chuck Lever verified the effectiveness of this technique:
 * http://www.citi.umich.edu/techreports/reports/citi-tr-00-1.pdf
 *
 * These primes are chosen to be bit-sparse, that is operations on
 * them can use shifts and additions instead of multiplications for
 * machines where multiplications are slow.
 */

#include <asm/types.h>

/* 2^31 + 2^29 - 2^25 + 2^22 - 2^19 - 2^16 + 1 */
#define GOLDEN_RATIO_PRIME_32 0x9e370001UL
/*  2^63 + 2^61 - 2^57 + 2^54 - 2^51 - 2^18 + 1 */
#define GOLDEN_RATIO_PRIME_64 0x9e37fffffffc0001UL

#if BITS_PER_LONG == 32
#define GOLDEN_RATIO_PRIME GOLDEN_RATIO_PRIME_32
#define hash_long(val, bits) hash_32(val, bits)
#elif BITS_PER_LONG == 64
#define hash_long(val, bits) hash_64(val, bits)
#define GOLDEN_RATIO_PRIME GOLDEN_RATIO_PRIME_64
#else
#error Wordsize not 32 or 64
#endif

static inline u64 hash_64(u64 val, unsigned int bits)
{
	u64 hash = val;

/*  Sigh, gcc can't optimise this alone like it does for 32 bits. */
	u64 n = hash;
	n <<= 18;
	hash -= n;
	n <<= 33;
	hash -= n;
	n <<= 3;
	hash += n;
	n <<= 3;
	hash -= n;
	n <<= 4;
	hash += n;
	n <<= 2;
	hash += n;

/* High bits are more random, so use them. */
	return hash >> (64 - bits);
}

static inline u32 hash_32(u32 val, unsigned int bits)
{
	/* On some cpus multiply is faster, on others gcc will do shifts */
	u32 hash = val * GOLDEN_RATIO_PRIME_32;

/* High bits are more random, so use them. */
	return hash >> (32 - bits);
}

static inline unsigned long hash_ptr(const void *ptr, unsigned int bits)
{
	return hash_long((unsigned long)ptr, bits);
}
#endif /* _LINUX_HASH_H */

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Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2023-02-17 06:21:15
..	dir	-	root/root	0755	2023-02-17 06:21:15
addr-map.c		525 B	root/root	0644	2020-10-13 04:11:22
alloc.c		1.16 KB	root/root	0644	2020-10-13 04:11:22
arith.c		2.24 KB	root/root	0644	2020-10-13 04:11:22
common_session_state.h		6.76 KB	root/root	0644	2020-10-13 04:11:22
copy.c		4 KB	root/root	0644	2020-10-13 04:11:22
debug.h		413 B	root/root	0644	2020-10-13 04:11:22
ilog2.h		2.87 KB	root/root	0644	2020-10-13 04:11:22
io.c		4.43 KB	root/root	0644	2020-10-13 04:11:22
linux_defs.h		5.58 KB	root/root	0644	2020-10-13 04:11:22
linux_hash.h		1.83 KB	root/root	0644	2020-10-13 04:11:22
linux_types.h		654 B	root/root	0644	2020-10-13 04:11:22
loc2c-runtime.h		2.44 KB	root/root	0644	2020-10-13 04:11:22
map_list.h		1.03 KB	root/root	0644	2020-10-13 04:11:22
map_runtime.h		5.04 KB	root/root	0644	2020-10-13 04:11:22
namespaces.h		0 B	root/root	0644	2020-10-13 04:11:22
offptr.h		4.68 KB	root/root	0644	2020-10-13 04:11:22
offset_list.h		4.32 KB	root/root	0644	2020-10-13 04:11:22
perf.c		0 B	root/root	0644	2020-10-13 04:11:22
print.c		2.37 KB	root/root	0644	2020-10-13 04:11:22
probe_lock.h		1.81 KB	root/root	0644	2020-10-13 04:11:22
regs.c		2.14 KB	root/root	0644	2020-10-13 04:11:22
runtime.h		9.49 KB	root/root	0644	2020-10-13 04:11:22
runtime_context.h		6.4 KB	root/root	0644	2020-10-13 04:11:22
runtime_defines.h		235 B	root/root	0644	2020-10-13 04:11:22
session_attributes.c		1.68 KB	root/root	0644	2020-10-13 04:11:22
session_attributes.h		772 B	root/root	0644	2020-10-13 04:11:22
shm.c		6.03 KB	root/root	0644	2020-10-13 04:11:22
stapdyn.h		3.37 KB	root/root	0644	2020-10-13 04:11:22
stat_runtime.h		1.79 KB	root/root	0644	2020-10-13 04:11:22
sym.c		40 B	root/root	0644	2020-10-13 04:11:22
task_finder.c		0 B	root/root	0644	2020-10-13 04:11:22
timer.c		2.71 KB	root/root	0644	2020-10-13 04:11:22
transport.c		30.4 KB	root/root	0644	2020-10-13 04:11:22
transport.h		3.88 KB	root/root	0644	2020-10-13 04:11:22
unwind.c		0 B	root/root	0644	2020-10-13 04:11:22
uprobes-regs.c		1.94 KB	root/root	0644	2020-10-13 04:11:22
uprobes.c		1.76 KB	root/root	0644	2020-10-13 04:11:22
uprobes.h		953 B	root/root	0644	2020-10-13 04:11:22