cachestat

query the page cache statistics of a file

sys_cachestat(unsigned int fd, struct cachestat_range *cstat_range, struct cachestat *cstat, unsigned int flags)

register	value
`eax`	451, the syscall number
`ebx`	unsigned int fd
`ecx`	struct cachestat_range *cstat_range
`edx`	struct cachestat *cstat
`esi`	unsigned int flags
`eax`	the return value

Then run int 0x80 to enter the kernel.

Same syscall on other architectures