On Fri, Jul 31, 2009 at 6:52 AM, Karel Zak<kzak@xxxxxxxxxx> wrote: > Linux exports HZ to userspace via AT_CLKTCK auxiliary vector entry, > for more details see include/linux/auxvec.h. > > The vector is area between process's environ[] and argv[]. I guess glibc > reads the vector for the sysconf() call. > > Karel Hi Karel... I checked that using the following command: $ LD_SHOW_AUXV=1 sleep 1 AT_SYSINFO: 0xb7fed414 AT_SYSINFO_EHDR: 0xb7fed000 AT_HWCAP: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe AT_PAGESZ: 4096 AT_CLKTCK: 100 AT_PHDR: 0x8048034 AT_PHENT: 32 AT_PHNUM: 8 AT_BASE: 0x0 AT_FLAGS: 0x0 AT_ENTRY: 0x8048c50 AT_UID: 500 AT_EUID: 500 AT_GID: 500 AT_EGID: 500 AT_SECURE: 0 AT_??? (0x19): 0xbf84ba4b AT_??? (0x1f): 0xbf84cff1 AT_PLATFORM: i686 It seems that user space sees HZ as 100, while in fact my current running kernel is compiled with HZ=300. What do you think about it? Or is there something wrong with my conclusion? -- regards, Mulyadi Santosa Freelance Linux trainer blog: the-hydra.blogspot.com -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
