* [PATCH v2 0/2] mm: khugepaged: cleanup and a minor tuning in THP
@ 2021-04-07 3:05 yanfei.xu
2021-04-07 3:05 ` [PATCH v2 1/2] mm: khugepaged: use macro to align addresses yanfei.xu
` (2 more replies)
0 siblings, 3 replies; 8+ messages in thread
From: yanfei.xu @ 2021-04-07 3:05 UTC (permalink / raw)
To: shy828301; +Cc: linux-mm, linux-kernel
From: Yanfei Xu <yanfei.xu@windriver.com>
v1-->v2:
1.correct the wrong location where the goto jump to.
2.keep the cond_resched() dropped in v1 still there.
Thanks for Yang's review.
Yanfei Xu (2):
mm: khugepaged: use macro to align addresses
mm: khugepaged: check MMF_DISABLE_THP ahead of iterating over vmas
mm/khugepaged.c | 29 +++++++++++++++--------------
1 file changed, 15 insertions(+), 14 deletions(-)
--
2.27.0
^ permalink raw reply [flat|nested] 8+ messages in thread* [PATCH v2 1/2] mm: khugepaged: use macro to align addresses 2021-04-07 3:05 [PATCH v2 0/2] mm: khugepaged: cleanup and a minor tuning in THP yanfei.xu @ 2021-04-07 3:05 ` yanfei.xu 2021-04-07 21:40 ` Yang Shi 2021-04-07 3:05 ` [PATCH v2 2/2] mm: khugepaged: check MMF_DISABLE_THP ahead of iterating over vmas yanfei.xu 2021-04-14 2:14 ` [PATCH v2 0/2] mm: khugepaged: cleanup and a minor tuning in THP Xu, Yanfei 2 siblings, 1 reply; 8+ messages in thread From: yanfei.xu @ 2021-04-07 3:05 UTC (permalink / raw) To: shy828301; +Cc: linux-mm, linux-kernel From: Yanfei Xu <yanfei.xu@windriver.com> We could use macro to deal with the addresses which need to be aligned to improve readability of codes. Signed-off-by: Yanfei Xu <yanfei.xu@windriver.com> --- mm/khugepaged.c | 27 +++++++++++++-------------- 1 file changed, 13 insertions(+), 14 deletions(-) diff --git a/mm/khugepaged.c b/mm/khugepaged.c index a7d6cb912b05..a6012b9259a2 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -517,8 +517,8 @@ int khugepaged_enter_vma_merge(struct vm_area_struct *vma, if (!hugepage_vma_check(vma, vm_flags)) return 0; - hstart = (vma->vm_start + ~HPAGE_PMD_MASK) & HPAGE_PMD_MASK; - hend = vma->vm_end & HPAGE_PMD_MASK; + hstart = ALIGN(vma->vm_start, HPAGE_PMD_SIZE); + hend = ALIGN_DOWN(vma->vm_end, HPAGE_PMD_SIZE); if (hstart < hend) return khugepaged_enter(vma, vm_flags); return 0; @@ -979,8 +979,8 @@ static int hugepage_vma_revalidate(struct mm_struct *mm, unsigned long address, if (!vma) return SCAN_VMA_NULL; - hstart = (vma->vm_start + ~HPAGE_PMD_MASK) & HPAGE_PMD_MASK; - hend = vma->vm_end & HPAGE_PMD_MASK; + hstart = ALIGN(vma->vm_start, HPAGE_PMD_SIZE); + hend = ALIGN_DOWN(vma->vm_end, HPAGE_PMD_SIZE); if (address < hstart || address + HPAGE_PMD_SIZE > hend) return SCAN_ADDRESS_RANGE; if (!hugepage_vma_check(vma, vma->vm_flags)) @@ -1070,7 +1070,7 @@ static void collapse_huge_page(struct mm_struct *mm, struct mmu_notifier_range range; gfp_t gfp; - VM_BUG_ON(address & ~HPAGE_PMD_MASK); + VM_BUG_ON(!IS_ALIGNED(address, HPAGE_PMD_SIZE)); /* Only allocate from the target node */ gfp = alloc_hugepage_khugepaged_gfpmask() | __GFP_THISNODE; @@ -1235,7 +1235,7 @@ static int khugepaged_scan_pmd(struct mm_struct *mm, int node = NUMA_NO_NODE, unmapped = 0; bool writable = false; - VM_BUG_ON(address & ~HPAGE_PMD_MASK); + VM_BUG_ON(!IS_ALIGNED(address, HPAGE_PMD_SIZE)); pmd = mm_find_pmd(mm, address); if (!pmd) { @@ -1414,7 +1414,7 @@ static int khugepaged_add_pte_mapped_thp(struct mm_struct *mm, { struct mm_slot *mm_slot; - VM_BUG_ON(addr & ~HPAGE_PMD_MASK); + VM_BUG_ON(!IS_ALIGNED(addr, HPAGE_PMD_SIZE)); spin_lock(&khugepaged_mm_lock); mm_slot = get_mm_slot(mm); @@ -1437,7 +1437,7 @@ static int khugepaged_add_pte_mapped_thp(struct mm_struct *mm, */ void collapse_pte_mapped_thp(struct mm_struct *mm, unsigned long addr) { - unsigned long haddr = addr & HPAGE_PMD_MASK; + unsigned long haddr = ALIGN_DOWN(addr, HPAGE_PMD_SIZE); struct vm_area_struct *vma = find_vma(mm, haddr); struct page *hpage; pte_t *start_pte, *pte; @@ -1584,7 +1584,7 @@ static void retract_page_tables(struct address_space *mapping, pgoff_t pgoff) if (vma->anon_vma) continue; addr = vma->vm_start + ((pgoff - vma->vm_pgoff) << PAGE_SHIFT); - if (addr & ~HPAGE_PMD_MASK) + if (!IS_ALIGNED(addr, HPAGE_PMD_SIZE)) continue; if (vma->vm_end < addr + HPAGE_PMD_SIZE) continue; @@ -2070,7 +2070,7 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages, { struct mm_slot *mm_slot; struct mm_struct *mm; - struct vm_area_struct *vma; + struct vm_area_struct *vma = NULL; int progress = 0; VM_BUG_ON(!pages); @@ -2092,7 +2092,6 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages, * Don't wait for semaphore (to avoid long wait times). Just move to * the next mm on the list. */ - vma = NULL; if (unlikely(!mmap_read_trylock(mm))) goto breakouterloop_mmap_lock; if (likely(!khugepaged_test_exit(mm))) @@ -2112,15 +2111,15 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages, progress++; continue; } - hstart = (vma->vm_start + ~HPAGE_PMD_MASK) & HPAGE_PMD_MASK; - hend = vma->vm_end & HPAGE_PMD_MASK; + hstart = ALIGN(vma->vm_start, HPAGE_PMD_SIZE); + hend = ALIGN_DOWN(vma->vm_end, HPAGE_PMD_SIZE); if (hstart >= hend) goto skip; if (khugepaged_scan.address > hend) goto skip; if (khugepaged_scan.address < hstart) khugepaged_scan.address = hstart; - VM_BUG_ON(khugepaged_scan.address & ~HPAGE_PMD_MASK); + VM_BUG_ON(!IS_ALIGNED(khugepaged_scan.address, HPAGE_PMD_SIZE)); if (shmem_file(vma->vm_file) && !shmem_huge_enabled(vma)) goto skip; -- 2.27.0 ^ permalink raw reply related [flat|nested] 8+ messages in thread
* Re: [PATCH v2 1/2] mm: khugepaged: use macro to align addresses 2021-04-07 3:05 ` [PATCH v2 1/2] mm: khugepaged: use macro to align addresses yanfei.xu @ 2021-04-07 21:40 ` Yang Shi 0 siblings, 0 replies; 8+ messages in thread From: Yang Shi @ 2021-04-07 21:40 UTC (permalink / raw) To: yanfei.xu; +Cc: Linux MM, Linux Kernel Mailing List On Tue, Apr 6, 2021 at 8:06 PM <yanfei.xu@windriver.com> wrote: > > From: Yanfei Xu <yanfei.xu@windriver.com> > > We could use macro to deal with the addresses which need to be aligned > to improve readability of codes. Reviewed-by: Yang Shi <shy828301@gmail.com> > > Signed-off-by: Yanfei Xu <yanfei.xu@windriver.com> > --- > mm/khugepaged.c | 27 +++++++++++++-------------- > 1 file changed, 13 insertions(+), 14 deletions(-) > > diff --git a/mm/khugepaged.c b/mm/khugepaged.c > index a7d6cb912b05..a6012b9259a2 100644 > --- a/mm/khugepaged.c > +++ b/mm/khugepaged.c > @@ -517,8 +517,8 @@ int khugepaged_enter_vma_merge(struct vm_area_struct *vma, > if (!hugepage_vma_check(vma, vm_flags)) > return 0; > > - hstart = (vma->vm_start + ~HPAGE_PMD_MASK) & HPAGE_PMD_MASK; > - hend = vma->vm_end & HPAGE_PMD_MASK; > + hstart = ALIGN(vma->vm_start, HPAGE_PMD_SIZE); > + hend = ALIGN_DOWN(vma->vm_end, HPAGE_PMD_SIZE); > if (hstart < hend) > return khugepaged_enter(vma, vm_flags); > return 0; > @@ -979,8 +979,8 @@ static int hugepage_vma_revalidate(struct mm_struct *mm, unsigned long address, > if (!vma) > return SCAN_VMA_NULL; > > - hstart = (vma->vm_start + ~HPAGE_PMD_MASK) & HPAGE_PMD_MASK; > - hend = vma->vm_end & HPAGE_PMD_MASK; > + hstart = ALIGN(vma->vm_start, HPAGE_PMD_SIZE); > + hend = ALIGN_DOWN(vma->vm_end, HPAGE_PMD_SIZE); > if (address < hstart || address + HPAGE_PMD_SIZE > hend) > return SCAN_ADDRESS_RANGE; > if (!hugepage_vma_check(vma, vma->vm_flags)) > @@ -1070,7 +1070,7 @@ static void collapse_huge_page(struct mm_struct *mm, > struct mmu_notifier_range range; > gfp_t gfp; > > - VM_BUG_ON(address & ~HPAGE_PMD_MASK); > + VM_BUG_ON(!IS_ALIGNED(address, HPAGE_PMD_SIZE)); > > /* Only allocate from the target node */ > gfp = alloc_hugepage_khugepaged_gfpmask() | __GFP_THISNODE; > @@ -1235,7 +1235,7 @@ static int khugepaged_scan_pmd(struct mm_struct *mm, > int node = NUMA_NO_NODE, unmapped = 0; > bool writable = false; > > - VM_BUG_ON(address & ~HPAGE_PMD_MASK); > + VM_BUG_ON(!IS_ALIGNED(address, HPAGE_PMD_SIZE)); > > pmd = mm_find_pmd(mm, address); > if (!pmd) { > @@ -1414,7 +1414,7 @@ static int khugepaged_add_pte_mapped_thp(struct mm_struct *mm, > { > struct mm_slot *mm_slot; > > - VM_BUG_ON(addr & ~HPAGE_PMD_MASK); > + VM_BUG_ON(!IS_ALIGNED(addr, HPAGE_PMD_SIZE)); > > spin_lock(&khugepaged_mm_lock); > mm_slot = get_mm_slot(mm); > @@ -1437,7 +1437,7 @@ static int khugepaged_add_pte_mapped_thp(struct mm_struct *mm, > */ > void collapse_pte_mapped_thp(struct mm_struct *mm, unsigned long addr) > { > - unsigned long haddr = addr & HPAGE_PMD_MASK; > + unsigned long haddr = ALIGN_DOWN(addr, HPAGE_PMD_SIZE); > struct vm_area_struct *vma = find_vma(mm, haddr); > struct page *hpage; > pte_t *start_pte, *pte; > @@ -1584,7 +1584,7 @@ static void retract_page_tables(struct address_space *mapping, pgoff_t pgoff) > if (vma->anon_vma) > continue; > addr = vma->vm_start + ((pgoff - vma->vm_pgoff) << PAGE_SHIFT); > - if (addr & ~HPAGE_PMD_MASK) > + if (!IS_ALIGNED(addr, HPAGE_PMD_SIZE)) > continue; > if (vma->vm_end < addr + HPAGE_PMD_SIZE) > continue; > @@ -2070,7 +2070,7 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages, > { > struct mm_slot *mm_slot; > struct mm_struct *mm; > - struct vm_area_struct *vma; > + struct vm_area_struct *vma = NULL; > int progress = 0; > > VM_BUG_ON(!pages); > @@ -2092,7 +2092,6 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages, > * Don't wait for semaphore (to avoid long wait times). Just move to > * the next mm on the list. > */ > - vma = NULL; > if (unlikely(!mmap_read_trylock(mm))) > goto breakouterloop_mmap_lock; > if (likely(!khugepaged_test_exit(mm))) > @@ -2112,15 +2111,15 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages, > progress++; > continue; > } > - hstart = (vma->vm_start + ~HPAGE_PMD_MASK) & HPAGE_PMD_MASK; > - hend = vma->vm_end & HPAGE_PMD_MASK; > + hstart = ALIGN(vma->vm_start, HPAGE_PMD_SIZE); > + hend = ALIGN_DOWN(vma->vm_end, HPAGE_PMD_SIZE); > if (hstart >= hend) > goto skip; > if (khugepaged_scan.address > hend) > goto skip; > if (khugepaged_scan.address < hstart) > khugepaged_scan.address = hstart; > - VM_BUG_ON(khugepaged_scan.address & ~HPAGE_PMD_MASK); > + VM_BUG_ON(!IS_ALIGNED(khugepaged_scan.address, HPAGE_PMD_SIZE)); > if (shmem_file(vma->vm_file) && !shmem_huge_enabled(vma)) > goto skip; > > -- > 2.27.0 > ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH v2 1/2] mm: khugepaged: use macro to align addresses @ 2021-04-07 21:40 ` Yang Shi 0 siblings, 0 replies; 8+ messages in thread From: Yang Shi @ 2021-04-07 21:40 UTC (permalink / raw) To: yanfei.xu; +Cc: Linux MM, Linux Kernel Mailing List On Tue, Apr 6, 2021 at 8:06 PM <yanfei.xu@windriver.com> wrote: > > From: Yanfei Xu <yanfei.xu@windriver.com> > > We could use macro to deal with the addresses which need to be aligned > to improve readability of codes. Reviewed-by: Yang Shi <shy828301@gmail.com> > > Signed-off-by: Yanfei Xu <yanfei.xu@windriver.com> > --- > mm/khugepaged.c | 27 +++++++++++++-------------- > 1 file changed, 13 insertions(+), 14 deletions(-) > > diff --git a/mm/khugepaged.c b/mm/khugepaged.c > index a7d6cb912b05..a6012b9259a2 100644 > --- a/mm/khugepaged.c > +++ b/mm/khugepaged.c > @@ -517,8 +517,8 @@ int khugepaged_enter_vma_merge(struct vm_area_struct *vma, > if (!hugepage_vma_check(vma, vm_flags)) > return 0; > > - hstart = (vma->vm_start + ~HPAGE_PMD_MASK) & HPAGE_PMD_MASK; > - hend = vma->vm_end & HPAGE_PMD_MASK; > + hstart = ALIGN(vma->vm_start, HPAGE_PMD_SIZE); > + hend = ALIGN_DOWN(vma->vm_end, HPAGE_PMD_SIZE); > if (hstart < hend) > return khugepaged_enter(vma, vm_flags); > return 0; > @@ -979,8 +979,8 @@ static int hugepage_vma_revalidate(struct mm_struct *mm, unsigned long address, > if (!vma) > return SCAN_VMA_NULL; > > - hstart = (vma->vm_start + ~HPAGE_PMD_MASK) & HPAGE_PMD_MASK; > - hend = vma->vm_end & HPAGE_PMD_MASK; > + hstart = ALIGN(vma->vm_start, HPAGE_PMD_SIZE); > + hend = ALIGN_DOWN(vma->vm_end, HPAGE_PMD_SIZE); > if (address < hstart || address + HPAGE_PMD_SIZE > hend) > return SCAN_ADDRESS_RANGE; > if (!hugepage_vma_check(vma, vma->vm_flags)) > @@ -1070,7 +1070,7 @@ static void collapse_huge_page(struct mm_struct *mm, > struct mmu_notifier_range range; > gfp_t gfp; > > - VM_BUG_ON(address & ~HPAGE_PMD_MASK); > + VM_BUG_ON(!IS_ALIGNED(address, HPAGE_PMD_SIZE)); > > /* Only allocate from the target node */ > gfp = alloc_hugepage_khugepaged_gfpmask() | __GFP_THISNODE; > @@ -1235,7 +1235,7 @@ static int khugepaged_scan_pmd(struct mm_struct *mm, > int node = NUMA_NO_NODE, unmapped = 0; > bool writable = false; > > - VM_BUG_ON(address & ~HPAGE_PMD_MASK); > + VM_BUG_ON(!IS_ALIGNED(address, HPAGE_PMD_SIZE)); > > pmd = mm_find_pmd(mm, address); > if (!pmd) { > @@ -1414,7 +1414,7 @@ static int khugepaged_add_pte_mapped_thp(struct mm_struct *mm, > { > struct mm_slot *mm_slot; > > - VM_BUG_ON(addr & ~HPAGE_PMD_MASK); > + VM_BUG_ON(!IS_ALIGNED(addr, HPAGE_PMD_SIZE)); > > spin_lock(&khugepaged_mm_lock); > mm_slot = get_mm_slot(mm); > @@ -1437,7 +1437,7 @@ static int khugepaged_add_pte_mapped_thp(struct mm_struct *mm, > */ > void collapse_pte_mapped_thp(struct mm_struct *mm, unsigned long addr) > { > - unsigned long haddr = addr & HPAGE_PMD_MASK; > + unsigned long haddr = ALIGN_DOWN(addr, HPAGE_PMD_SIZE); > struct vm_area_struct *vma = find_vma(mm, haddr); > struct page *hpage; > pte_t *start_pte, *pte; > @@ -1584,7 +1584,7 @@ static void retract_page_tables(struct address_space *mapping, pgoff_t pgoff) > if (vma->anon_vma) > continue; > addr = vma->vm_start + ((pgoff - vma->vm_pgoff) << PAGE_SHIFT); > - if (addr & ~HPAGE_PMD_MASK) > + if (!IS_ALIGNED(addr, HPAGE_PMD_SIZE)) > continue; > if (vma->vm_end < addr + HPAGE_PMD_SIZE) > continue; > @@ -2070,7 +2070,7 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages, > { > struct mm_slot *mm_slot; > struct mm_struct *mm; > - struct vm_area_struct *vma; > + struct vm_area_struct *vma = NULL; > int progress = 0; > > VM_BUG_ON(!pages); > @@ -2092,7 +2092,6 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages, > * Don't wait for semaphore (to avoid long wait times). Just move to > * the next mm on the list. > */ > - vma = NULL; > if (unlikely(!mmap_read_trylock(mm))) > goto breakouterloop_mmap_lock; > if (likely(!khugepaged_test_exit(mm))) > @@ -2112,15 +2111,15 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages, > progress++; > continue; > } > - hstart = (vma->vm_start + ~HPAGE_PMD_MASK) & HPAGE_PMD_MASK; > - hend = vma->vm_end & HPAGE_PMD_MASK; > + hstart = ALIGN(vma->vm_start, HPAGE_PMD_SIZE); > + hend = ALIGN_DOWN(vma->vm_end, HPAGE_PMD_SIZE); > if (hstart >= hend) > goto skip; > if (khugepaged_scan.address > hend) > goto skip; > if (khugepaged_scan.address < hstart) > khugepaged_scan.address = hstart; > - VM_BUG_ON(khugepaged_scan.address & ~HPAGE_PMD_MASK); > + VM_BUG_ON(!IS_ALIGNED(khugepaged_scan.address, HPAGE_PMD_SIZE)); > if (shmem_file(vma->vm_file) && !shmem_huge_enabled(vma)) > goto skip; > > -- > 2.27.0 > ^ permalink raw reply [flat|nested] 8+ messages in thread
* [PATCH v2 2/2] mm: khugepaged: check MMF_DISABLE_THP ahead of iterating over vmas 2021-04-07 3:05 [PATCH v2 0/2] mm: khugepaged: cleanup and a minor tuning in THP yanfei.xu 2021-04-07 3:05 ` [PATCH v2 1/2] mm: khugepaged: use macro to align addresses yanfei.xu @ 2021-04-07 3:05 ` yanfei.xu 2021-04-07 21:40 ` Yang Shi 2021-04-14 2:14 ` [PATCH v2 0/2] mm: khugepaged: cleanup and a minor tuning in THP Xu, Yanfei 2 siblings, 1 reply; 8+ messages in thread From: yanfei.xu @ 2021-04-07 3:05 UTC (permalink / raw) To: shy828301; +Cc: linux-mm, linux-kernel From: Yanfei Xu <yanfei.xu@windriver.com> We could check MMF_DISABLE_THP ahead of iterating over all of vma. Otherwise if some mm_struct contain a large number of vma, there will be amounts meaningless cpu cycles cost. Signed-off-by: Yanfei Xu <yanfei.xu@windriver.com> --- mm/khugepaged.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/khugepaged.c b/mm/khugepaged.c index a6012b9259a2..f4ad25a7db55 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -2094,6 +2094,8 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages, */ if (unlikely(!mmap_read_trylock(mm))) goto breakouterloop_mmap_lock; + if (test_bit(MMF_DISABLE_THP, &mm->flags)) + goto breakouterloop; if (likely(!khugepaged_test_exit(mm))) vma = find_vma(mm, khugepaged_scan.address); -- 2.27.0 ^ permalink raw reply related [flat|nested] 8+ messages in thread
* Re: [PATCH v2 2/2] mm: khugepaged: check MMF_DISABLE_THP ahead of iterating over vmas 2021-04-07 3:05 ` [PATCH v2 2/2] mm: khugepaged: check MMF_DISABLE_THP ahead of iterating over vmas yanfei.xu @ 2021-04-07 21:40 ` Yang Shi 0 siblings, 0 replies; 8+ messages in thread From: Yang Shi @ 2021-04-07 21:40 UTC (permalink / raw) To: Xu, Yanfei; +Cc: Linux MM, Linux Kernel Mailing List On Tue, Apr 6, 2021 at 8:06 PM <yanfei.xu@windriver.com> wrote: > > From: Yanfei Xu <yanfei.xu@windriver.com> > > We could check MMF_DISABLE_THP ahead of iterating over all of vma. > Otherwise if some mm_struct contain a large number of vma, there will > be amounts meaningless cpu cycles cost. Reviewed-by: Yang Shi <shy828301@gmail.com> > > Signed-off-by: Yanfei Xu <yanfei.xu@windriver.com> > --- > mm/khugepaged.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/mm/khugepaged.c b/mm/khugepaged.c > index a6012b9259a2..f4ad25a7db55 100644 > --- a/mm/khugepaged.c > +++ b/mm/khugepaged.c > @@ -2094,6 +2094,8 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages, > */ > if (unlikely(!mmap_read_trylock(mm))) > goto breakouterloop_mmap_lock; > + if (test_bit(MMF_DISABLE_THP, &mm->flags)) > + goto breakouterloop; > if (likely(!khugepaged_test_exit(mm))) > vma = find_vma(mm, khugepaged_scan.address); > > -- > 2.27.0 > ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH v2 2/2] mm: khugepaged: check MMF_DISABLE_THP ahead of iterating over vmas @ 2021-04-07 21:40 ` Yang Shi 0 siblings, 0 replies; 8+ messages in thread From: Yang Shi @ 2021-04-07 21:40 UTC (permalink / raw) To: Xu, Yanfei; +Cc: Linux MM, Linux Kernel Mailing List On Tue, Apr 6, 2021 at 8:06 PM <yanfei.xu@windriver.com> wrote: > > From: Yanfei Xu <yanfei.xu@windriver.com> > > We could check MMF_DISABLE_THP ahead of iterating over all of vma. > Otherwise if some mm_struct contain a large number of vma, there will > be amounts meaningless cpu cycles cost. Reviewed-by: Yang Shi <shy828301@gmail.com> > > Signed-off-by: Yanfei Xu <yanfei.xu@windriver.com> > --- > mm/khugepaged.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/mm/khugepaged.c b/mm/khugepaged.c > index a6012b9259a2..f4ad25a7db55 100644 > --- a/mm/khugepaged.c > +++ b/mm/khugepaged.c > @@ -2094,6 +2094,8 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages, > */ > if (unlikely(!mmap_read_trylock(mm))) > goto breakouterloop_mmap_lock; > + if (test_bit(MMF_DISABLE_THP, &mm->flags)) > + goto breakouterloop; > if (likely(!khugepaged_test_exit(mm))) > vma = find_vma(mm, khugepaged_scan.address); > > -- > 2.27.0 > ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH v2 0/2] mm: khugepaged: cleanup and a minor tuning in THP 2021-04-07 3:05 [PATCH v2 0/2] mm: khugepaged: cleanup and a minor tuning in THP yanfei.xu 2021-04-07 3:05 ` [PATCH v2 1/2] mm: khugepaged: use macro to align addresses yanfei.xu 2021-04-07 3:05 ` [PATCH v2 2/2] mm: khugepaged: check MMF_DISABLE_THP ahead of iterating over vmas yanfei.xu @ 2021-04-14 2:14 ` Xu, Yanfei 2 siblings, 0 replies; 8+ messages in thread From: Xu, Yanfei @ 2021-04-14 2:14 UTC (permalink / raw) To: shy828301, Andrew Morton; +Cc: linux-mm, linux-kernel Gentle ping. On 4/7/21 11:05 AM, yanfei.xu@windriver.com wrote: > From: Yanfei Xu <yanfei.xu@windriver.com> > > v1-->v2: > 1.correct the wrong location where the goto jump to. > 2.keep the cond_resched() dropped in v1 still there. > > Thanks for Yang's review. > > Yanfei Xu (2): > mm: khugepaged: use macro to align addresses > mm: khugepaged: check MMF_DISABLE_THP ahead of iterating over vmas > > mm/khugepaged.c | 29 +++++++++++++++-------------- > 1 file changed, 15 insertions(+), 14 deletions(-) > ^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2021-04-14 2:14 UTC | newest] Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2021-04-07 3:05 [PATCH v2 0/2] mm: khugepaged: cleanup and a minor tuning in THP yanfei.xu 2021-04-07 3:05 ` [PATCH v2 1/2] mm: khugepaged: use macro to align addresses yanfei.xu 2021-04-07 21:40 ` Yang Shi 2021-04-07 21:40 ` Yang Shi 2021-04-07 3:05 ` [PATCH v2 2/2] mm: khugepaged: check MMF_DISABLE_THP ahead of iterating over vmas yanfei.xu 2021-04-07 21:40 ` Yang Shi 2021-04-07 21:40 ` Yang Shi 2021-04-14 2:14 ` [PATCH v2 0/2] mm: khugepaged: cleanup and a minor tuning in THP Xu, Yanfei
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