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x86: add hugepagesz option on 64-bit
Add an hugepagesz=... option similar to IA64, PPC etc. to x86-64. This finally allows to select GB pages for hugetlbfs in x86 now that all the infrastructure is in place. Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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3 changed files with 28 additions and 2 deletions
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@ -774,8 +774,15 @@ and is between 256 and 4096 characters. It is defined in the file
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hisax= [HW,ISDN]
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See Documentation/isdn/README.HiSax.
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hugepages= [HW,X86-32,IA-64] Maximal number of HugeTLB pages.
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hugepagesz= [HW,IA-64,PPC] The size of the HugeTLB pages.
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hugepages= [HW,X86-32,IA-64] HugeTLB pages to allocate at boot.
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hugepagesz= [HW,IA-64,PPC,X86-64] The size of the HugeTLB pages.
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On x86 this option can be specified multiple times
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interleaved with hugepages= to reserve huge pages
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of different sizes. Valid pages sizes on x86-64
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are 2M (when the CPU supports "pse") and 1G (when the
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CPU supports the "pdpe1gb" cpuinfo flag)
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Note that 1GB pages can only be allocated at boot time
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using hugepages= and not freed afterwards.
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i8042.direct [HW] Put keyboard port into non-translated mode
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i8042.dumbkbd [HW] Pretend that controller can only read data from
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@ -425,3 +425,20 @@ hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
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#endif /*HAVE_ARCH_HUGETLB_UNMAPPED_AREA*/
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#ifdef CONFIG_X86_64
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static __init int setup_hugepagesz(char *opt)
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{
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unsigned long ps = memparse(opt, &opt);
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if (ps == PMD_SIZE) {
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hugetlb_add_hstate(PMD_SHIFT - PAGE_SHIFT);
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} else if (ps == PUD_SIZE && cpu_has_gbpages) {
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hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT);
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} else {
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printk(KERN_ERR "hugepagesz: Unsupported page size %lu M\n",
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ps >> 20);
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return 0;
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}
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return 1;
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}
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__setup("hugepagesz=", setup_hugepagesz);
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#endif
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@ -32,6 +32,8 @@
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#define HPAGE_MASK (~(HPAGE_SIZE - 1))
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#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
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#define HUGE_MAX_HSTATE 2
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/* to align the pointer to the (next) page boundary */
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#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
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