Hi Bert, >>> The argument >>> .I cpusetsize >>> is the length (in bytes) of the buffer pointed to by >>> .IR cpuset . >>> Normally this argument would be specified as >>> .IR sizeof(cpu_set_t) . >>> The constant >>> .B CPU_SETSIZE >>> specifies a value one greater than the >>> maximum CPU number that can be stored in a CPU set. >> >> I came independently to the same conclusion than you. AFAICS,glibc defines >> the cpu_set_t to be a 1024 bits long structure. But the kernel defines the >> corresponding structure to be a bit field of appropriate length to store >> NR_CPUS. >> >> Interesting enough, the exact size of the kernel structure is determined by >> the glibc on the 1st call to pthread_setaffinity_np(). >> >> We'll run into troubles if run this on a server with more than 1K core ;-) > Thats why glibc provides a new set of function to handle cpu_set_t > with more than 1K bits. > Look for the definitions of macros with a _S suffix in <sched.h>. Thanks for alerting me to this. Of course those macros need documenting. I've pretty much completed a page documenting them. Would you be willing to check it over? Cheers, Michael -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ git://git.kernel.org/pub/scm/docs/man-pages/man-pages.git man-pages online: http://www.kernel.org/doc/man-pages/online_pages.html Found a bug? http://www.kernel.org/doc/man-pages/reporting_bugs.html -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
