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mm/mmu_gather: track page size with mmu gather and force flush if page size change

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This allows an arch which needs to do special handing with respect to
different page size when flushing tlb to implement the same in mmu
gather.

Link: http://lkml.kernel.org/r/1465049193-22197-3-git-send-email-aneesh.kumar@linux.vnet.ibm.com
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Hugh Dickins <hughd@google.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: David Rientjes <rientjes@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Minchan Kim <minchan.kim@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Aneesh Kumar K.V
2016-07-26 15:24:12 -07:00
committed by Linus Torvalds
parent e9d55e1570
commit e77b0852b5
9 changed files with 93 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

27
include/asm-generic/tlb.h
View File

@@ -112,6 +112,7 @@ struct mmu_gather {
* that that we can adjust the range after the flush
*/
unsigned long addr;
int page_size;
};
#define HAVE_GENERIC_MMU_GATHER
@@ -120,7 +121,8 @@ void tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm, unsigned long
void tlb_flush_mmu(struct mmu_gather *tlb);
void tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start,
unsigned long end);
bool __tlb_remove_page(struct mmu_gather *tlb, struct page *page);
extern bool __tlb_remove_page_size(struct mmu_gather *tlb, struct page *page,
int page_size);
static inline void __tlb_adjust_range(struct mmu_gather *tlb,
unsigned long address)
@@ -145,23 +147,36 @@ static inline void __tlb_reset_range(struct mmu_gather *tlb)
}
}
static inline void tlb_remove_page_size(struct mmu_gather *tlb,
struct page *page, int page_size)
{
if (__tlb_remove_page_size(tlb, page, page_size)) {
tlb_flush_mmu(tlb);
tlb->page_size = page_size;
__tlb_adjust_range(tlb, tlb->addr);
__tlb_remove_page_size(tlb, page, page_size);
}
}
static bool __tlb_remove_page(struct mmu_gather *tlb, struct page *page)
{
return __tlb_remove_page_size(tlb, page, PAGE_SIZE);
}
/* tlb_remove_page
* Similar to __tlb_remove_page but will call tlb_flush_mmu() itself when
* required.
*/
static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
{
if (__tlb_remove_page(tlb, page)) {
tlb_flush_mmu(tlb);
__tlb_adjust_range(tlb, tlb->addr);
__tlb_remove_page(tlb, page);
}
return tlb_remove_page_size(tlb, page, PAGE_SIZE);
}
static inline bool __tlb_remove_pte_page(struct mmu_gather *tlb, struct page *page)
{
/* active->nr should be zero when we call this */
VM_BUG_ON_PAGE(tlb->active->nr, page);
tlb->page_size = PAGE_SIZE;
__tlb_adjust_range(tlb, tlb->addr);
return __tlb_remove_page(tlb, page);
}