Linux Kernel code "current" macro Post: 302535013

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Top Forums Programming Linux Kernel code "current" macro Post 302535013 by Corona688 on Wednesday 29th of June 2011 11:15:38 AM

06-29-2011

Registered User

Quote:

Originally Posted by kumaran_5555

I was going through the Linux code, i stuck with few inline assembly language code,

I have tried online but in vain. Any help is much appreciated. Thanks.

esp would be the x86 stack pointer. And %0 is a variable parameter which in this case means ~(THREAD_SIZE-1) The stack is the context which thread-local variables, among other things, reside inside. Each thread gets their own little independent chunk.

I believe they're doing something similar to aligning a pointer along page boundaries. If the stack pointer was, say 0xfeff7352 and THREAD_SIZE was 0x00010000, they'd be doing 0xfeff7352 & 0xffff0000, you'd get 0xfeff0000 out of it. I suppose doing this would get you the very top of the thread's stack instance, where (I think) things like the thread ID are kept handy.

THREAD_SIZE may not be the system page size but is probably at least a power-of-two multiple of it.

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hwlocality_linux_libnuma_nodemask

Helpers for manipulating Linux libnuma nodemask_t(3)	     Hardware Locality (hwloc)	      Helpers for manipulating Linux libnuma nodemask_t(3)

NAME

       Helpers for manipulating Linux libnuma nodemask_t -

   Functions
       static inline int hwloc_cpuset_to_linux_libnuma_nodemask (hwloc_topology_t topology, hwloc_const_cpuset_t cpuset, nodemask_t *nodemask)
       static inline int hwloc_nodeset_to_linux_libnuma_nodemask (hwloc_topology_t topology, hwloc_const_nodeset_t nodeset, nodemask_t *nodemask)
       static inline int hwloc_cpuset_from_linux_libnuma_nodemask (hwloc_topology_t topology, hwloc_cpuset_t cpuset, const nodemask_t *nodemask)
       static inline int hwloc_nodeset_from_linux_libnuma_nodemask (hwloc_topology_t topology, hwloc_nodeset_t nodeset, const nodemask_t
	   *nodemask)

Detailed Description
       Note:
	   The Linux libnuma nodemask_t interface is deprecated and its implementation is at least incorrect with respect to sparse NUMA node ids.
	   It is strongly advised to use struct bitmask instead of nodemask_t, or even to use hwloc directly.

Function Documentation
   static inline int hwloc_cpuset_from_linux_libnuma_nodemask (hwloc_topology_ttopology, hwloc_cpuset_tcpuset, const nodemask_t *nodemask)
       [static]
       Convert libnuma nodemask nodemask into hwloc CPU set cpuset. This function may be used before calling some old libnuma functions that use a
       nodemask_t as an output parameter.

   static inline int hwloc_cpuset_to_linux_libnuma_nodemask (hwloc_topology_ttopology, hwloc_const_cpuset_tcpuset, nodemask_t *nodemask) [static]
       Convert hwloc CPU set cpuset into libnuma nodemask nodemask. This function may be used before calling some old libnuma functions that use a
       nodemask_t as an input parameter.

   static inline int hwloc_nodeset_from_linux_libnuma_nodemask (hwloc_topology_ttopology, hwloc_nodeset_tnodeset, const nodemask_t *nodemask)
       [static]
       Convert libnuma nodemask nodemask into hwloc NUMA node set nodeset. This function may be used before calling some old libnuma functions
       that use a nodemask_t as an output parameter.

   static inline int hwloc_nodeset_to_linux_libnuma_nodemask (hwloc_topology_ttopology, hwloc_const_nodeset_tnodeset, nodemask_t *nodemask)
       [static]
       Convert hwloc NUMA node set nodeset into libnuma nodemask nodemask. This function may be used before calling some old libnuma functions
       that use a nodemask_t as an input parameter.

Author
       Generated automatically by Doxygen for Hardware Locality (hwloc) from the source code.

Version 1.4.1							  Mon Feb 27 2012	      Helpers for manipulating Linux libnuma nodemask_t(3)