Messages in this thread | | | From | KOSAKI Motohiro <> | Subject | Re: [PATCH 1/2] Report the pagesize backing a VMA in /proc/pid/smaps | Date | Wed, 24 Sep 2008 21:32:24 +0900 (JST) |
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> > Dave, please let me know getpagesize() function return to 4k or 64k on ppc64. > > I think the PageSize line of the /proc/pid/smap and getpagesize() result should be matched. > > > > otherwise, enduser may be confused. > > > > To distinguish between the two, I now report the kernel pagesize and the > mmu pagesize like so > > KernelPageSize: 64 kB > MMUPageSize: 4 kB > > This is running a kernel with a 64K base pagesize on a PPC970MP which > does not support 64K hardware pagesizes. > > Does this make sense?
Hmmm, Who want to this infomation?
I agreed with - An administrator want to know these page are normal or huge. - An administrator want to know hugepage size. (e.g. x86_64 has two hugepage size (2M and 1G))
but above ppc64 case seems deeply implementation depended infomation and nobody want to know it.
it seems a bottleneck of future enhancement.
then I disagreed with - show both KernelPageSize and MMUPageSize in normal page.
I like following two choice
1) in normal page, show PAZE_SIZE
because, any userland application woks as pagesize==PAZE_SIZE on current powerpc architecture.
because
fs/binfmt_elf.c ------------------------------ static int create_elf_tables(struct linux_binprm *bprm, struct elfhdr *exec, unsigned long load_addr, unsigned long interp_load_addr) { (snip) NEW_AUX_ENT(AT_HWCAP, ELF_HWCAP); NEW_AUX_ENT(AT_PAGESZ, ELF_EXEC_PAGESIZE); /* pass ELF_EXEC_PAGESIZE to libc */
include/asm-powerpc/elf.h ----------------------------- #define ELF_EXEC_PAGESIZE PAGE_SIZE
2) in normal page, no display any page size. only hugepage case, display page size.
because, An administrator want to hugepage size only. (AFAICS)
Thought?
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