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a=wKuvFiaSGQ0qltdbU6+NXLB8nM8=:19 a=Ol13hO9ccFRV9qXi2t6ftBPywas=:19 a=xqWC_Br6kY4A:10 a=dt9VzEwgFbYA:10 a=GoEa3M9JfhUA:10 a=yPCof4ZbAAAA:8 a=lOzPg2vIf24U1BXouUEA:9 X-Proofpoint-ORIG-GUID: 6DyrqAqxmUnXm2FFQA_edAxpPh-1hBo_ X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNTE5MDA4NCBTYWx0ZWRfX1gVfF4PX94fh OEQeso2rk5Fm7f/uEUFrJKjdhfhZPjjey2LdhqgOwNSYbMiTqiUwWHi6iD/g6417vQZvi3RXpCS iRiyblPu97RFePAcXnX/V+RezjdKbE2WDa+rsmwSCyTLoMdI7bQS8OkB2ETNsd7ZhuX8mI03RzY ZxSm5L9AxFqdAlm/22TXK6k0jMp0+9Pi4bxsvTGGX4MLqVqCpA9rLxCM9WylSa1R5+fQQi1Zmh0 bJadlQQpKj3H5E3Vomp7TLOmRRFMTSqZz4RzuMyXNYPEBorKCGKMkZ3xV90MXHi2LrgSJEqvnDN H0asUHqlawJmRVFmLOuaoCkhfegK6kAINDH4+5BDM+bGfznM5VK5BtyQTitSzWJniNqOkp7Y9O4 UbvMX8V1zkixHBnTqjPoRbPmRyUrH0fzKuDInwlZRNLg0/yxSjA8dKwBsjafoKgsMmdXSlNC Content-Type: text/plain; charset="utf-8" In subsequent commits we are going to determine KSM eligibility prior to a VMA being constructed, at which point we will of course not yet have access to a VMA pointer. It is trivial to boil down the check logic to be parameterised on mm_struct, file and VMA flags, so do so. As a part of this change, additionally expose and use file_is_dax() to determine whether a file is being mapped under a DAX inode. Signed-off-by: Lorenzo Stoakes Acked-by: David Hildenbrand Reviewed-by: Chengming Zhou --- include/linux/fs.h | 7 ++++++- mm/ksm.c | 32 ++++++++++++++++++++------------ 2 files changed, 26 insertions(+), 13 deletions(-) diff --git a/include/linux/fs.h b/include/linux/fs.h index 09c8495dacdb..e1397e2b55ea 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -3691,9 +3691,14 @@ void setattr_copy(struct mnt_idmap *, struct inode *= inode, =20 extern int file_update_time(struct file *file); =20 +static inline bool file_is_dax(const struct file *file) +{ + return file && IS_DAX(file->f_mapping->host); +} + static inline bool vma_is_dax(const struct vm_area_struct *vma) { - return vma->vm_file && IS_DAX(vma->vm_file->f_mapping->host); + return file_is_dax(vma->vm_file); } =20 static inline bool vma_is_fsdax(struct vm_area_struct *vma) diff --git a/mm/ksm.c b/mm/ksm.c index 8583fb91ef13..08d486f188ff 100644 --- a/mm/ksm.c +++ b/mm/ksm.c @@ -677,28 +677,33 @@ static int break_ksm(struct vm_area_struct *vma, unsi= gned long addr, bool lock_v return (ret & VM_FAULT_OOM) ? -ENOMEM : 0; } =20 -static bool vma_ksm_compatible(struct vm_area_struct *vma) +static bool ksm_compatible(const struct file *file, vm_flags_t vm_flags) { - if (vma->vm_flags & (VM_SHARED | VM_MAYSHARE | VM_PFNMAP | - VM_IO | VM_DONTEXPAND | VM_HUGETLB | - VM_MIXEDMAP| VM_DROPPABLE)) + if (vm_flags & (VM_SHARED | VM_MAYSHARE | VM_PFNMAP | + VM_IO | VM_DONTEXPAND | VM_HUGETLB | + VM_MIXEDMAP | VM_DROPPABLE)) return false; /* just ignore the advice */ =20 - if (vma_is_dax(vma)) + if (file_is_dax(file)) return false; =20 #ifdef VM_SAO - if (vma->vm_flags & VM_SAO) + if (vm_flags & VM_SAO) return false; #endif #ifdef VM_SPARC_ADI - if (vma->vm_flags & VM_SPARC_ADI) + if (vm_flags & VM_SPARC_ADI) return false; #endif =20 return true; } =20 +static bool vma_ksm_compatible(struct vm_area_struct *vma) +{ + return ksm_compatible(vma->vm_file, vma->vm_flags); +} + static struct vm_area_struct *find_mergeable_vma(struct mm_struct *mm, unsigned long addr) { @@ -2696,14 +2701,17 @@ static int ksm_scan_thread(void *nothing) return 0; } =20 -static void __ksm_add_vma(struct vm_area_struct *vma) +static bool __ksm_should_add_vma(const struct file *file, vm_flags_t vm_fl= ags) { - unsigned long vm_flags =3D vma->vm_flags; - if (vm_flags & VM_MERGEABLE) - return; + return false; + + return ksm_compatible(file, vm_flags); +} =20 - if (vma_ksm_compatible(vma)) +static void __ksm_add_vma(struct vm_area_struct *vma) +{ + if (__ksm_should_add_vma(vma->vm_file, vma->vm_flags)) vm_flags_set(vma, VM_MERGEABLE); } =20 --=20 2.49.0