On Mon, Aug 31, 2009 at 11:56 AM, krushnaal pai<[email protected]> wrote: > can sumone plz give me a complete list of the system calls(according to > linux kernel 2.6.18 or above) that makes disk access at some point of time. > > For eg. read sys call makes a disk access when it doesnt find the page in > page cache.
Almost any syscall can make a disk access - if it performs memory allocation, this can block on a pageout. Any syscall that access user memory can make a disk access on a page fault (unless you're mlockall'd, but then see above). There are other syscalls that make disk accesses for other reasons, eg ioctl, read/write, etc. I don't know if there's a full list anywhere; this is something of an implementation detail. If you're asking because you're trying to avoid the latency of a disk hit, you might want to ask on the linux realtime development list - see linux-rt-users at http://rt.wiki.kernel.org/index.php/Mailinglists -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to [email protected] Please read the FAQ at http://kernelnewbies.org/FAQ
