Commit 39dde65c authored by Chen, Kenneth W's avatar Chen, Kenneth W Committed by Linus Torvalds
Browse files

[PATCH] shared page table for hugetlb page 



Following up with the work on shared page table done by Dave McCracken.  This
set of patch target shared page table for hugetlb memory only.

The shared page table is particular useful in the situation of large number of
independent processes sharing large shared memory segments.  In the normal
page case, the amount of memory saved from process' page table is quite
significant.  For hugetlb, the saving on page table memory is not the primary
objective (as hugetlb itself already cuts down page table overhead
significantly), instead, the purpose of using shared page table on hugetlb is
to allow faster TLB refill and smaller cache pollution upon TLB miss.

With PT sharing, pte entries are shared among hundreds of processes, the cache
consumption used by all the page table is smaller and in return, application
gets much higher cache hit ratio.  One other effect is that cache hit ratio
with hardware page walker hitting on pte in cache will be higher and this
helps to reduce tlb miss latency.  These two effects contribute to higher
application performance.

Signed-off-by: default avatarKen Chen <kenneth.w.chen@intel.com>
Acked-by: default avatarHugh Dickins <hugh@veritas.com>
Cc: Dave McCracken <dmccr@us.ibm.com>
Cc: William Lee Irwin III <wli@holomorphy.com>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: David Gibson <david@gibson.dropbear.id.au>
Cc: Adam Litke <agl@us.ibm.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent e1dbeda6

arch/i386/mm/hugetlbpage.c

+111 −1
Original line number Diff line number Diff line
@@ -17,6 +17,113 @@ 
#include <asm/tlb.h>

#include <asm/tlbflush.h>



static unsigned long page_table_shareable(struct vm_area_struct *svma,

				struct vm_area_struct *vma,

				unsigned long addr, pgoff_t idx)

{

	unsigned long saddr = ((idx - svma->vm_pgoff) << PAGE_SHIFT) +

				svma->vm_start;

	unsigned long sbase = saddr & PUD_MASK;

	unsigned long s_end = sbase + PUD_SIZE;



	/*

	 * match the virtual addresses, permission and the alignment of the

	 * page table page.

	 */

	if (pmd_index(addr) != pmd_index(saddr) ||

	    vma->vm_flags != svma->vm_flags ||

	    sbase < svma->vm_start || svma->vm_end < s_end)

		return 0;



	return saddr;

}



static int vma_shareable(struct vm_area_struct *vma, unsigned long addr)

{

	unsigned long base = addr & PUD_MASK;

	unsigned long end = base + PUD_SIZE;



	/*

	 * check on proper vm_flags and page table alignment

	 */

	if (vma->vm_flags & VM_MAYSHARE &&

	    vma->vm_start <= base && end <= vma->vm_end)

		return 1;

	return 0;

}



/*

 * search for a shareable pmd page for hugetlb.

 */

static void huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud)

{

	struct vm_area_struct *vma = find_vma(mm, addr);

	struct address_space *mapping = vma->vm_file->f_mapping;

	pgoff_t idx = ((addr - vma->vm_start) >> PAGE_SHIFT) +

			vma->vm_pgoff;

	struct prio_tree_iter iter;

	struct vm_area_struct *svma;

	unsigned long saddr;

	pte_t *spte = NULL;



	if (!vma_shareable(vma, addr))

		return;



	spin_lock(&mapping->i_mmap_lock);

	vma_prio_tree_foreach(svma, &iter, &mapping->i_mmap, idx, idx) {

		if (svma == vma)

			continue;



		saddr = page_table_shareable(svma, vma, addr, idx);

		if (saddr) {

			spte = huge_pte_offset(svma->vm_mm, saddr);

			if (spte) {

				get_page(virt_to_page(spte));

				break;

			}

		}

	}



	if (!spte)

		goto out;



	spin_lock(&mm->page_table_lock);

	if (pud_none(*pud))

		pud_populate(mm, pud, (unsigned long) spte & PAGE_MASK);

	else

		put_page(virt_to_page(spte));

	spin_unlock(&mm->page_table_lock);

out:

	spin_unlock(&mapping->i_mmap_lock);

}



/*

 * unmap huge page backed by shared pte.

 *

 * Hugetlb pte page is ref counted at the time of mapping.  If pte is shared

 * indicated by page_count > 1, unmap is achieved by clearing pud and

 * decrementing the ref count. If count == 1, the pte page is not shared.

 *

 * called with vma->vm_mm->page_table_lock held.

 *

 * returns: 1 successfully unmapped a shared pte page

 *	    0 the underlying pte page is not shared, or it is the last user

 */

int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep)

{

	pgd_t *pgd = pgd_offset(mm, *addr);

	pud_t *pud = pud_offset(pgd, *addr);



	BUG_ON(page_count(virt_to_page(ptep)) == 0);

	if (page_count(virt_to_page(ptep)) == 1)

		return 0;



	pud_clear(pud);

	put_page(virt_to_page(ptep));

	*addr = ALIGN(*addr, HPAGE_SIZE * PTRS_PER_PTE) - HPAGE_SIZE;

	return 1;

}



pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr)

{

	pgd_t *pgd;
@@ -25,8 +132,11 @@ pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr) 


	pgd = pgd_offset(mm, addr);

	pud = pud_alloc(mm, pgd, addr);

	if (pud)

	if (pud) {

		if (pud_none(*pud))

			huge_pmd_share(mm, addr, pud);

		pte = (pte_t *) pmd_alloc(mm, pud, addr);

	}

	BUG_ON(pte && !pte_none(*pte) && !pte_huge(*pte));



	return pte;

arch/ia64/mm/hugetlbpage.c

+5 −0
Original line number Diff line number Diff line
@@ -64,6 +64,11 @@ huge_pte_offset (struct mm_struct *mm, unsigned long addr) 
	return pte;

}



int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep)

{

	return 0;

}



#define mk_pte_huge(entry) { pte_val(entry) |= _PAGE_P; }



/*

arch/powerpc/mm/hugetlbpage.c

+5 −0
Original line number Diff line number Diff line
@@ -146,6 +146,11 @@ pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr) 
	return hugepte_offset(hpdp, addr);

}



int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep)

{

	return 0;

}



static void free_hugepte_range(struct mmu_gather *tlb, hugepd_t *hpdp)

{

	pte_t *hugepte = hugepd_page(*hpdp);

arch/sh/mm/hugetlbpage.c

+5 −0
Original line number Diff line number Diff line
@@ -63,6 +63,11 @@ pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr) 
	return pte;

}



int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep)

{

	return 0;

}



struct page *follow_huge_addr(struct mm_struct *mm,

			      unsigned long address, int write)

{

arch/sh64/mm/hugetlbpage.c

+5 −0
Original line number Diff line number Diff line
@@ -53,6 +53,11 @@ pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr) 
	return pte;

}



int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep)

{

	return 0;

}



void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,

		     pte_t *ptep, pte_t entry)

{

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