forked from Minki/linux
[PARISC] Update bitops from parisc tree
Optimize ext2_find_next_zero_bit. Gives about 25% perf improvement with a
rsync test with ext3.
Signed-off-by: Randolph Chung <tausq@parisc-linux.org>
fix ext3 performance - ext2_find_next_zero() was culprit.
Kudos to jejb for pointing out the the possibility that ext2_test_bit
and ext2_find_next_zero() may in fact not be enumerating bits in
the bitmap because of endianess. Took sparc64 implementation and
adapted it to our tree. I suspect the real problem is ffz() wants
an unsigned long and was getting garbage in the top half of the
unsigned int. Not confirmed but that's what I suspect.
Signed-off-by: Grant Grundler <grundler@parisc-linux.org>
Fix find_next_bit for 32-bit
Make masking consistent for bitops
From: Joel Soete <soete.joel@tiscali.be>
Signed-off-by: Randolph Chung <tausq@parisc-linux.org>
Add back incorrectly removed ext2_find_first_zero_bit definition
Signed-off-by: James Bottomley <jejb@parisc-linux.org>
Fixup bitops.h to use volatile for *_bit() ops
Based on this email thread:
http://marc.theaimsgroup.com/?t=108826637900003
In a nutshell:
*_bit() want use of volatile.
__*_bit() are "relaxed" and don't use spinlock or volatile.
other minor changes:
o replaces hweight64() macro with alias to generic_hweight64() (Joel Soete)
o cleanup ext2* macros so (a) it's obvious what the XOR magic is about
and (b) one version that works for both 32/64-bit.
o replace 2 uses of CONFIG_64BIT with __LP64__. bitops.h used both.
I think header files that might go to user space should use
something userspace will know about (__LP64__).
Signed-off-by: Grant Grundler <grundler@parisc-linux.org>
Move SHIFT_PER_LONG to standard location for BITS_PER_LONG (asm/types.h)
and ditch the second definition of BITS_PER_LONG in bitops.h
Signed-off-by: Grant Grundler <grundler@parisc-linux.org>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
This commit is contained in:
Grant Grundler
Kyle McMartin
parent
2464212f68
commit
a366064c3f
@ -2,7 +2,7 @@
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#define _PARISC_BITOPS_H
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#include <linux/compiler.h>
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#include <asm/spinlock.h>
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#include <asm/types.h> /* for BITS_PER_LONG/SHIFT_PER_LONG */
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#include <asm/byteorder.h>
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#include <asm/atomic.h>
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@ -12,193 +12,157 @@
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* to include/asm-i386/bitops.h or kerneldoc
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*/
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#ifdef __LP64__
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# define SHIFT_PER_LONG 6
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#ifndef BITS_PER_LONG
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# define BITS_PER_LONG 64
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#endif
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#else
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# define SHIFT_PER_LONG 5
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#ifndef BITS_PER_LONG
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# define BITS_PER_LONG 32
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#endif
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#endif
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#define CHOP_SHIFTCOUNT(x) ((x) & (BITS_PER_LONG - 1))
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#define CHOP_SHIFTCOUNT(x) (((unsigned long) (x)) & (BITS_PER_LONG - 1))
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#define smp_mb__before_clear_bit() smp_mb()
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#define smp_mb__after_clear_bit() smp_mb()
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static __inline__ void set_bit(int nr, volatile unsigned long * address)
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/* See http://marc.theaimsgroup.com/?t=108826637900003 for discussion
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* on use of volatile and __*_bit() (set/clear/change):
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* *_bit() want use of volatile.
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* __*_bit() are "relaxed" and don't use spinlock or volatile.
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*/
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static __inline__ void set_bit(int nr, volatile unsigned long * addr)
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{
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unsigned long mask;
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unsigned long *addr = (unsigned long *) address;
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unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr);
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unsigned long flags;
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addr += (nr >> SHIFT_PER_LONG);
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mask = 1L << CHOP_SHIFTCOUNT(nr);
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_atomic_spin_lock_irqsave(addr, flags);
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*addr |= mask;
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_atomic_spin_unlock_irqrestore(addr, flags);
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}
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static __inline__ void __set_bit(int nr, volatile unsigned long * address)
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static __inline__ void __set_bit(unsigned long nr, volatile unsigned long * addr)
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{
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unsigned long mask;
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unsigned long *addr = (unsigned long *) address;
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unsigned long *m = (unsigned long *) addr + (nr >> SHIFT_PER_LONG);
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addr += (nr >> SHIFT_PER_LONG);
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mask = 1L << CHOP_SHIFTCOUNT(nr);
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*addr |= mask;
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*m |= 1UL << CHOP_SHIFTCOUNT(nr);
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}
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static __inline__ void clear_bit(int nr, volatile unsigned long * address)
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static __inline__ void clear_bit(int nr, volatile unsigned long * addr)
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{
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unsigned long mask;
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unsigned long *addr = (unsigned long *) address;
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unsigned long mask = ~(1UL << CHOP_SHIFTCOUNT(nr));
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unsigned long flags;
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addr += (nr >> SHIFT_PER_LONG);
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mask = 1L << CHOP_SHIFTCOUNT(nr);
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_atomic_spin_lock_irqsave(addr, flags);
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*addr &= ~mask;
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*addr &= mask;
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_atomic_spin_unlock_irqrestore(addr, flags);
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}
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static __inline__ void __clear_bit(unsigned long nr, volatile unsigned long * address)
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static __inline__ void __clear_bit(unsigned long nr, volatile unsigned long * addr)
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{
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unsigned long mask;
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unsigned long *addr = (unsigned long *) address;
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unsigned long *m = (unsigned long *) addr + (nr >> SHIFT_PER_LONG);
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addr += (nr >> SHIFT_PER_LONG);
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mask = 1L << CHOP_SHIFTCOUNT(nr);
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*addr &= ~mask;
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*m &= ~(1UL << CHOP_SHIFTCOUNT(nr));
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}
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static __inline__ void change_bit(int nr, volatile unsigned long * address)
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static __inline__ void change_bit(int nr, volatile unsigned long * addr)
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{
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unsigned long mask;
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unsigned long *addr = (unsigned long *) address;
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unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr);
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unsigned long flags;
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addr += (nr >> SHIFT_PER_LONG);
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mask = 1L << CHOP_SHIFTCOUNT(nr);
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_atomic_spin_lock_irqsave(addr, flags);
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*addr ^= mask;
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_atomic_spin_unlock_irqrestore(addr, flags);
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}
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static __inline__ void __change_bit(int nr, volatile unsigned long * address)
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static __inline__ void __change_bit(unsigned long nr, volatile unsigned long * addr)
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{
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unsigned long mask;
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unsigned long *addr = (unsigned long *) address;
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unsigned long *m = (unsigned long *) addr + (nr >> SHIFT_PER_LONG);
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addr += (nr >> SHIFT_PER_LONG);
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mask = 1L << CHOP_SHIFTCOUNT(nr);
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*addr ^= mask;
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*m ^= 1UL << CHOP_SHIFTCOUNT(nr);
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}
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static __inline__ int test_and_set_bit(int nr, volatile unsigned long * address)
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static __inline__ int test_and_set_bit(int nr, volatile unsigned long * addr)
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{
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unsigned long mask;
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unsigned long *addr = (unsigned long *) address;
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int oldbit;
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unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr);
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unsigned long oldbit;
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unsigned long flags;
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addr += (nr >> SHIFT_PER_LONG);
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mask = 1L << CHOP_SHIFTCOUNT(nr);
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_atomic_spin_lock_irqsave(addr, flags);
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oldbit = (*addr & mask) ? 1 : 0;
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*addr |= mask;
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oldbit = *addr;
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*addr = oldbit | mask;
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_atomic_spin_unlock_irqrestore(addr, flags);
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return oldbit;
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return (oldbit & mask) ? 1 : 0;
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}
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static __inline__ int __test_and_set_bit(int nr, volatile unsigned long * address)
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{
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unsigned long mask;
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unsigned long *addr = (unsigned long *) address;
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int oldbit;
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unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr);
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unsigned long oldbit;
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unsigned long *addr = (unsigned long *)address + (nr >> SHIFT_PER_LONG);
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addr += (nr >> SHIFT_PER_LONG);
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mask = 1L << CHOP_SHIFTCOUNT(nr);
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oldbit = (*addr & mask) ? 1 : 0;
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*addr |= mask;
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oldbit = *addr;
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*addr = oldbit | mask;
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return oldbit;
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return (oldbit & mask) ? 1 : 0;
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}
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static __inline__ int test_and_clear_bit(int nr, volatile unsigned long * address)
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static __inline__ int test_and_clear_bit(int nr, volatile unsigned long * addr)
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{
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unsigned long mask;
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unsigned long *addr = (unsigned long *) address;
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int oldbit;
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unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr);
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unsigned long oldbit;
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unsigned long flags;
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addr += (nr >> SHIFT_PER_LONG);
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mask = 1L << CHOP_SHIFTCOUNT(nr);
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_atomic_spin_lock_irqsave(addr, flags);
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oldbit = (*addr & mask) ? 1 : 0;
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*addr &= ~mask;
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oldbit = *addr;
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*addr = oldbit & ~mask;
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_atomic_spin_unlock_irqrestore(addr, flags);
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return oldbit;
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return (oldbit & mask) ? 1 : 0;
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}
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static __inline__ int __test_and_clear_bit(int nr, volatile unsigned long * address)
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{
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unsigned long mask;
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unsigned long *addr = (unsigned long *) address;
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int oldbit;
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unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr);
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unsigned long *addr = (unsigned long *)address + (nr >> SHIFT_PER_LONG);
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unsigned long oldbit;
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addr += (nr >> SHIFT_PER_LONG);
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mask = 1L << CHOP_SHIFTCOUNT(nr);
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oldbit = (*addr & mask) ? 1 : 0;
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*addr &= ~mask;
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oldbit = *addr;
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*addr = oldbit & ~mask;
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return oldbit;
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return (oldbit & mask) ? 1 : 0;
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}
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static __inline__ int test_and_change_bit(int nr, volatile unsigned long * address)
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static __inline__ int test_and_change_bit(int nr, volatile unsigned long * addr)
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{
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unsigned long mask;
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unsigned long *addr = (unsigned long *) address;
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int oldbit;
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unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr);
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unsigned long oldbit;
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unsigned long flags;
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addr += (nr >> SHIFT_PER_LONG);
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mask = 1L << CHOP_SHIFTCOUNT(nr);
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_atomic_spin_lock_irqsave(addr, flags);
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oldbit = (*addr & mask) ? 1 : 0;
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*addr ^= mask;
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oldbit = *addr;
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*addr = oldbit ^ mask;
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_atomic_spin_unlock_irqrestore(addr, flags);
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return oldbit;
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return (oldbit & mask) ? 1 : 0;
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}
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static __inline__ int __test_and_change_bit(int nr, volatile unsigned long * address)
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{
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unsigned long mask;
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unsigned long *addr = (unsigned long *) address;
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int oldbit;
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unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr);
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unsigned long *addr = (unsigned long *)address + (nr >> SHIFT_PER_LONG);
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unsigned long oldbit;
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addr += (nr >> SHIFT_PER_LONG);
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mask = 1L << CHOP_SHIFTCOUNT(nr);
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oldbit = (*addr & mask) ? 1 : 0;
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*addr ^= mask;
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oldbit = *addr;
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*addr = oldbit ^ mask;
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return oldbit;
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return (oldbit & mask) ? 1 : 0;
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}
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static __inline__ int test_bit(int nr, const volatile unsigned long *address)
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{
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unsigned long mask;
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const unsigned long *addr = (const unsigned long *)address;
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addr += (nr >> SHIFT_PER_LONG);
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mask = 1L << CHOP_SHIFTCOUNT(nr);
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unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr);
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const unsigned long *addr = (const unsigned long *)address + (nr >> SHIFT_PER_LONG);
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return !!(*addr & mask);
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}
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@ -229,7 +193,7 @@ static __inline__ unsigned long __ffs(unsigned long x)
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unsigned long ret;
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__asm__(
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#if BITS_PER_LONG > 32
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#ifdef __LP64__
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" ldi 63,%1\n"
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" extrd,u,*<> %0,63,32,%%r0\n"
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" extrd,u,*TR %0,31,32,%0\n" /* move top 32-bits down */
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@ -304,14 +268,7 @@ static __inline__ int fls(int x)
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* hweightN: returns the hamming weight (i.e. the number
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* of bits set) of a N-bit word
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*/
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#define hweight64(x) \
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({ \
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unsigned long __x = (x); \
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unsigned int __w; \
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__w = generic_hweight32((unsigned int) __x); \
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__w += generic_hweight32((unsigned int) (__x>>32)); \
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__w; \
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})
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#define hweight64(x) generic_hweight64(x)
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#define hweight32(x) generic_hweight32(x)
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#define hweight16(x) generic_hweight16(x)
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#define hweight8(x) generic_hweight8(x)
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@ -324,7 +281,13 @@ static __inline__ int fls(int x)
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*/
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static inline int sched_find_first_bit(const unsigned long *b)
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{
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#ifndef __LP64__
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#ifdef __LP64__
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if (unlikely(b[0]))
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return __ffs(b[0]);
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if (unlikely(b[1]))
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return __ffs(b[1]) + 64;
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return __ffs(b[2]) + 128;
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#else
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if (unlikely(b[0]))
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return __ffs(b[0]);
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if (unlikely(b[1]))
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@ -334,14 +297,6 @@ static inline int sched_find_first_bit(const unsigned long *b)
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if (b[3])
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return __ffs(b[3]) + 96;
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return __ffs(b[4]) + 128;
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#else
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if (unlikely(b[0]))
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return __ffs(b[0]);
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if (unlikely(((unsigned int)b[1])))
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return __ffs(b[1]) + 64;
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if (b[1] >> 32)
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return __ffs(b[1] >> 32) + 96;
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return __ffs(b[2]) + 128;
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#endif
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}
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@ -391,7 +346,7 @@ found_middle:
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static __inline__ unsigned long find_next_bit(const unsigned long *addr, unsigned long size, unsigned long offset)
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{
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const unsigned long *p = addr + (offset >> 6);
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const unsigned long *p = addr + (offset >> SHIFT_PER_LONG);
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unsigned long result = offset & ~(BITS_PER_LONG-1);
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unsigned long tmp;
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@ -445,71 +400,90 @@ found_middle:
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* test_and_{set,clear}_bit guarantee atomicity without
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* disabling interrupts.
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*/
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#ifdef __LP64__
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#define ext2_set_bit(nr, addr) __test_and_set_bit((nr) ^ 0x38, (unsigned long *)addr)
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#define ext2_set_bit_atomic(l,nr,addr) test_and_set_bit((nr) ^ 0x38, (unsigned long *)addr)
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#define ext2_clear_bit(nr, addr) __test_and_clear_bit((nr) ^ 0x38, (unsigned long *)addr)
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#define ext2_clear_bit_atomic(l,nr,addr) test_and_clear_bit((nr) ^ 0x38, (unsigned long *)addr)
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#else
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#define ext2_set_bit(nr, addr) __test_and_set_bit((nr) ^ 0x18, (unsigned long *)addr)
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#define ext2_set_bit_atomic(l,nr,addr) test_and_set_bit((nr) ^ 0x18, (unsigned long *)addr)
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#define ext2_clear_bit(nr, addr) __test_and_clear_bit((nr) ^ 0x18, (unsigned long *)addr)
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#define ext2_clear_bit_atomic(l,nr,addr) test_and_clear_bit((nr) ^ 0x18, (unsigned long *)addr)
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#endif
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/* '3' is bits per byte */
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#define LE_BYTE_ADDR ((sizeof(unsigned long) - 1) << 3)
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#define ext2_test_bit(nr, addr) \
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test_bit((nr) ^ LE_BYTE_ADDR, (unsigned long *)addr)
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#define ext2_set_bit(nr, addr) \
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__test_and_set_bit((nr) ^ LE_BYTE_ADDR, (unsigned long *)addr)
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#define ext2_clear_bit(nr, addr) \
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__test_and_clear_bit((nr) ^ LE_BYTE_ADDR, (unsigned long *)addr)
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#define ext2_set_bit_atomic(l,nr,addr) \
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test_and_set_bit((nr) ^ LE_BYTE_ADDR, (unsigned long *)addr)
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#define ext2_clear_bit_atomic(l,nr,addr) \
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test_and_clear_bit( (nr) ^ LE_BYTE_ADDR, (unsigned long *)addr)
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#endif /* __KERNEL__ */
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static __inline__ int ext2_test_bit(int nr, __const__ void * addr)
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{
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__const__ unsigned char *ADDR = (__const__ unsigned char *) addr;
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return (ADDR[nr >> 3] >> (nr & 7)) & 1;
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}
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/*
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* This implementation of ext2_find_{first,next}_zero_bit was stolen from
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* Linus' asm-alpha/bitops.h and modified for a big-endian machine.
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*/
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#define ext2_find_first_zero_bit(addr, size) \
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ext2_find_next_zero_bit((addr), (size), 0)
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ext2_find_next_zero_bit((addr), (size), 0)
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extern __inline__ unsigned long ext2_find_next_zero_bit(void *addr,
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unsigned long size, unsigned long offset)
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/* include/linux/byteorder does not support "unsigned long" type */
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static inline unsigned long ext2_swabp(unsigned long * x)
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{
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unsigned int *p = ((unsigned int *) addr) + (offset >> 5);
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unsigned int result = offset & ~31UL;
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unsigned int tmp;
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#ifdef __LP64__
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return (unsigned long) __swab64p((u64 *) x);
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#else
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return (unsigned long) __swab32p((u32 *) x);
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#endif
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}
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/* include/linux/byteorder doesn't support "unsigned long" type */
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static inline unsigned long ext2_swab(unsigned long y)
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{
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#ifdef __LP64__
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return (unsigned long) __swab64((u64) y);
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#else
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return (unsigned long) __swab32((u32) y);
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#endif
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}
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static __inline__ unsigned long ext2_find_next_zero_bit(void *addr, unsigned long size, unsigned long offset)
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{
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unsigned long *p = (unsigned long *) addr + (offset >> SHIFT_PER_LONG);
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||||
unsigned long result = offset & ~(BITS_PER_LONG - 1);
|
||||
unsigned long tmp;
|
||||
|
||||
if (offset >= size)
|
||||
return size;
|
||||
size -= result;
|
||||
offset &= 31UL;
|
||||
offset &= (BITS_PER_LONG - 1UL);
|
||||
if (offset) {
|
||||
tmp = cpu_to_le32p(p++);
|
||||
tmp |= ~0UL >> (32-offset);
|
||||
if (size < 32)
|
||||
tmp = ext2_swabp(p++);
|
||||
tmp |= (~0UL >> (BITS_PER_LONG - offset));
|
||||
if (size < BITS_PER_LONG)
|
||||
goto found_first;
|
||||
if (tmp != ~0U)
|
||||
if (~tmp)
|
||||
goto found_middle;
|
||||
size -= 32;
|
||||
result += 32;
|
||||
size -= BITS_PER_LONG;
|
||||
result += BITS_PER_LONG;
|
||||
}
|
||||
while (size >= 32) {
|
||||
if ((tmp = cpu_to_le32p(p++)) != ~0U)
|
||||
goto found_middle;
|
||||
result += 32;
|
||||
size -= 32;
|
||||
|
||||
while (size & ~(BITS_PER_LONG - 1)) {
|
||||
if (~(tmp = *(p++)))
|
||||
goto found_middle_swap;
|
||||
result += BITS_PER_LONG;
|
||||
size -= BITS_PER_LONG;
|
||||
}
|
||||
if (!size)
|
||||
return result;
|
||||
tmp = cpu_to_le32p(p);
|
||||
tmp = ext2_swabp(p);
|
||||
found_first:
|
||||
tmp |= ~0U << size;
|
||||
tmp |= ~0UL << size;
|
||||
if (tmp == ~0UL) /* Are any bits zero? */
|
||||
return result + size; /* Nope. Skip ffz */
|
||||
found_middle:
|
||||
return result + ffz(tmp);
|
||||
|
||||
found_middle_swap:
|
||||
return result + ffz(ext2_swab(tmp));
|
||||
}
|
||||
|
||||
|
||||
/* Bitmap functions for the minix filesystem. */
|
||||
#define minix_test_and_set_bit(nr,addr) ext2_set_bit(nr,addr)
|
||||
#define minix_set_bit(nr,addr) ((void)ext2_set_bit(nr,addr))
|
||||
|
||||
@ -33,8 +33,10 @@ typedef unsigned long long __u64;
|
||||
|
||||
#ifdef __LP64__
|
||||
#define BITS_PER_LONG 64
|
||||
#define SHIFT_PER_LONG 6
|
||||
#else
|
||||
#define BITS_PER_LONG 32
|
||||
#define SHIFT_PER_LONG 5
|
||||
#endif
|
||||
|
||||
#ifndef __ASSEMBLY__
|
||||
|
||||
Loading…
Reference in New Issue
Block a user