Searched hist:284901 (Results 1 - 4 of 4) sorted by relevance
| /freebsd-11-stable/sys/amd64/include/ | ||
| H A D | atomic.h | diff 284901 Sun Jun 28 03:14:21 MDT 2015 kib Remove unneeded data dependency, currently imposed by atomic_load_acq(9), on it source, for x86. Right now, atomic_load_acq() on x86 is sequentially consistent with other atomics, code ensures this by doing store/load barrier by performing locked nop on the source. Provide separate primitive __storeload_barrier(), which is implemented as the locked nop done on a cpu-private variable, and put __storeload_barrier() before load, to keep seq_cst semantic but avoid introducing false dependency on the no-modification of the source for its later use. Note that seq_cst property of x86 atomic_load_acq() is not documented and not carried by atomics implementations on other architectures, although some kernel code relies on the behaviour. This commit does not intend to change this. Reviewed by: alc Discussed with: bde Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 2 weeks |
| /freebsd-11-stable/sys/i386/include/ | ||
| H A D | atomic.h | diff 284901 Sun Jun 28 03:14:21 MDT 2015 kib Remove unneeded data dependency, currently imposed by atomic_load_acq(9), on it source, for x86. Right now, atomic_load_acq() on x86 is sequentially consistent with other atomics, code ensures this by doing store/load barrier by performing locked nop on the source. Provide separate primitive __storeload_barrier(), which is implemented as the locked nop done on a cpu-private variable, and put __storeload_barrier() before load, to keep seq_cst semantic but avoid introducing false dependency on the no-modification of the source for its later use. Note that seq_cst property of x86 atomic_load_acq() is not documented and not carried by atomics implementations on other architectures, although some kernel code relies on the behaviour. This commit does not intend to change this. Reviewed by: alc Discussed with: bde Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 2 weeks |
| /freebsd-11-stable/sys/i386/i386/ | ||
| H A D | vm_machdep.c | diff 284901 Sun Jun 28 03:14:21 MDT 2015 kib Remove unneeded data dependency, currently imposed by atomic_load_acq(9), on it source, for x86. Right now, atomic_load_acq() on x86 is sequentially consistent with other atomics, code ensures this by doing store/load barrier by performing locked nop on the source. Provide separate primitive __storeload_barrier(), which is implemented as the locked nop done on a cpu-private variable, and put __storeload_barrier() before load, to keep seq_cst semantic but avoid introducing false dependency on the no-modification of the source for its later use. Note that seq_cst property of x86 atomic_load_acq() is not documented and not carried by atomics implementations on other architectures, although some kernel code relies on the behaviour. This commit does not intend to change this. Reviewed by: alc Discussed with: bde Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 2 weeks |
| /freebsd-11-stable/sys/amd64/amd64/ | ||
| H A D | vm_machdep.c | diff 284901 Sun Jun 28 03:14:21 MDT 2015 kib Remove unneeded data dependency, currently imposed by atomic_load_acq(9), on it source, for x86. Right now, atomic_load_acq() on x86 is sequentially consistent with other atomics, code ensures this by doing store/load barrier by performing locked nop on the source. Provide separate primitive __storeload_barrier(), which is implemented as the locked nop done on a cpu-private variable, and put __storeload_barrier() before load, to keep seq_cst semantic but avoid introducing false dependency on the no-modification of the source for its later use. Note that seq_cst property of x86 atomic_load_acq() is not documented and not carried by atomics implementations on other architectures, although some kernel code relies on the behaviour. This commit does not intend to change this. Reviewed by: alc Discussed with: bde Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 2 weeks |
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