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U2FsdGVkX195NxEPlgeFr84iReixMNt3d64L+wav5M5vj5ipyWES0kegcMJ+fsFfbbJqlXo+Cg6oZXkV9Pp5u/ztbJY9oxnS3UXqYUsxpHFTy1sKRxjB6fPbeSl7kniEGk3NHi+TX9YHJAEKac/qOvlzxmhcKphy0zHsFpszPH+0YSx0/A2kEI7WfTyj3LfrMa7zDMdHSZJg+nndvZyiBrpQ7XKuGInsbSjF+VRixtPrsp2+SA9KdlcD4ijoHua/occEQpjz/UxYMXU6E+KLir6QdZkujs3MMvuA1HPDmWiZyKa5IWUhxtnzlNRvqdfjDt5otKk6J9BNiaaUM5hY4BrPJ6CPRyvhGKD3C6LXS/OoCWzkZSUHUPA56wy+F14+FIvS0Jn/c/S0ifX0GCeWqys5Ua8y1NVpfyP2MknvQj/dW48X5sx3ipFx1WQRRmuyRtlMEauYTnW9O47sNerpGF0EKoV7N82SU1upYEaMxPcW2iwMHU9QpqXCtH6dBaFaWPmgaZwxQMix01i7fW9amYudKV5ari2udoZWrJpJKd99bdju8pP//M8MimbsWIaN1J58k9Qu/9gutgSZV8CJ1kaMcE8B8gsAJaiJXxTBYabShpjlGA5iGgdXY9B87sz/++K5enqiy+JaJ/Ou9gWBq7BSWFxalcQpL9OaPIvtitU978OCzgt8zc1sKbvFtHxfYthySKa1UUrVWK6aWSyL+FgHxfzd44PwceAGLs78A7g07phqYijaik9a3hnpLWXov2FiimAiHQ/kCEnm+17Fpb5obx9k8JmVERRA3BIJ74CUP4GEAzTu+nyYj/ZGYWF3ubeiCkHAGcAHLaoeoAeefc83LM7QS0PTEEbIC6MTDw39WtuLJArpRscYytoi6RuWWxx9BI8a+QIbbuqWXrwZDkJKsSdi0tlaSOgGb9R3Q4OByepPZo0wnjcBIq+6YlvZxvQqnRhRmuGVgdvvS/x kIRLTPRu 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These are the semantics of this function prior to the recent rewrite of the VMA merging logic, however we are now doing more work than necessary - positioning the VMA iterator at the prior VMA and performing tasks that are not required. Add a new field to the vmg struct to permit merge flags and add a new merge flag VMG_FLAG_JUST_EXPAND which implies this behaviour, and have do_brk_flags() use this. This fixes a reported performance regression in a brk() benchmarking suite. Reported-by: kernel test robot Closes: https://lore.kernel.org/linux-mm/202409301043.629bea78-oliver.sang@intel.com Fixes: cacded5e42b9 ("mm: avoid using vma_merge() for new VMAs") Signed-off-by: Lorenzo Stoakes Reviewed-by: Liam R. Howlett --- mm/mmap.c | 3 ++- mm/vma.c | 23 +++++++++++++++-------- mm/vma.h | 14 ++++++++++++++ 3 files changed, 31 insertions(+), 9 deletions(-) -- 2.46.2 diff --git a/mm/mmap.c b/mm/mmap.c index dd4b35a25aeb..4a13d9f138f6 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1744,7 +1744,8 @@ static int do_brk_flags(struct vma_iterator *vmi, struct vm_area_struct *vma, VMG_STATE(vmg, mm, vmi, addr, addr + len, flags, PHYS_PFN(addr)); vmg.prev = vma; - vma_iter_next_range(vmi); + /* vmi is positioned at prev, which this mode expects. */ + vmg.merge_flags = VMG_FLAG_JUST_EXPAND; if (vma_merge_new_range(&vmg)) goto out; diff --git a/mm/vma.c b/mm/vma.c index 4737afcb064c..b21ffec33f8e 100644 --- a/mm/vma.c +++ b/mm/vma.c @@ -917,6 +917,7 @@ struct vm_area_struct *vma_merge_new_range(struct vma_merge_struct *vmg) pgoff_t pgoff = vmg->pgoff; pgoff_t pglen = PHYS_PFN(end - start); bool can_merge_left, can_merge_right; + bool just_expand = vmg->merge_flags & VMG_FLAG_JUST_EXPAND; mmap_assert_write_locked(vmg->mm); VM_WARN_ON(vmg->vma); @@ -930,7 +931,7 @@ struct vm_area_struct *vma_merge_new_range(struct vma_merge_struct *vmg) return NULL; can_merge_left = can_vma_merge_left(vmg); - can_merge_right = can_vma_merge_right(vmg, can_merge_left); + can_merge_right = !just_expand && can_vma_merge_right(vmg, can_merge_left); /* If we can merge with the next VMA, adjust vmg accordingly. */ if (can_merge_right) { @@ -953,7 +954,11 @@ struct vm_area_struct *vma_merge_new_range(struct vma_merge_struct *vmg) if (can_merge_right && !can_merge_remove_vma(next)) vmg->end = end; - vma_prev(vmg->vmi); /* Equivalent to going to the previous range */ + /* In expand-only case we are already positioned at prev. */ + if (!just_expand) { + /* Equivalent to going to the previous range. */ + vma_prev(vmg->vmi); + } } /* @@ -967,12 +972,14 @@ struct vm_area_struct *vma_merge_new_range(struct vma_merge_struct *vmg) } /* If expansion failed, reset state. Allows us to retry merge later. */ - vmg->vma = NULL; - vmg->start = start; - vmg->end = end; - vmg->pgoff = pgoff; - if (vmg->vma == prev) - vma_iter_set(vmg->vmi, start); + if (!just_expand) { + vmg->vma = NULL; + vmg->start = start; + vmg->end = end; + vmg->pgoff = pgoff; + if (vmg->vma == prev) + vma_iter_set(vmg->vmi, start); + } return NULL; } diff --git a/mm/vma.h b/mm/vma.h index 819f994cf727..8c6ecc0dfbf6 100644 --- a/mm/vma.h +++ b/mm/vma.h @@ -59,6 +59,17 @@ enum vma_merge_state { VMA_MERGE_SUCCESS, }; +enum vma_merge_flags { + VMG_FLAG_DEFAULT = 0, + /* + * If we can expand, simply do so. We know there is nothing to merge to + * the right. Does not reset state upon failure to merge. The VMA + * iterator is assumed to be positioned at the previous VMA, rather than + * at the gap. + */ + VMG_FLAG_JUST_EXPAND = 1 << 0, +}; + /* Represents a VMA merge operation. */ struct vma_merge_struct { struct mm_struct *mm; @@ -75,6 +86,7 @@ struct vma_merge_struct { struct mempolicy *policy; struct vm_userfaultfd_ctx uffd_ctx; struct anon_vma_name *anon_name; + enum vma_merge_flags merge_flags; enum vma_merge_state state; }; @@ -99,6 +111,7 @@ static inline pgoff_t vma_pgoff_offset(struct vm_area_struct *vma, .flags = flags_, \ .pgoff = pgoff_, \ .state = VMA_MERGE_START, \ + .merge_flags = VMG_FLAG_DEFAULT, \ } #define VMG_VMA_STATE(name, vmi_, prev_, vma_, start_, end_) \ @@ -118,6 +131,7 @@ static inline pgoff_t vma_pgoff_offset(struct vm_area_struct *vma, .uffd_ctx = vma_->vm_userfaultfd_ctx, \ .anon_name = anon_vma_name(vma_), \ .state = VMA_MERGE_START, \ + .merge_flags = VMG_FLAG_DEFAULT, \ } #ifdef CONFIG_DEBUG_VM_MAPLE_TREE