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    Subject[PATCH v5 48/70] perf: Use VMA iterator
    Date
    From: "Liam R. Howlett" <Liam.Howlett@Oracle.com>

    The VMA iterator is faster than the linked list and removing the linked
    list will shrink the vm_area_struct.

    Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
    Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
    Acked-by: Vlastimil Babka <vbabka@suse.cz>
    ---
    kernel/events/core.c | 3 ++-
    kernel/events/uprobes.c | 9 ++++++---
    2 files changed, 8 insertions(+), 4 deletions(-)

    diff --git a/kernel/events/core.c b/kernel/events/core.c
    index 76c754e45d01..e4fca262afa3 100644
    --- a/kernel/events/core.c
    +++ b/kernel/events/core.c
    @@ -10303,8 +10303,9 @@ static void perf_addr_filter_apply(struct perf_addr_filter *filter,
    struct perf_addr_filter_range *fr)
    {
    struct vm_area_struct *vma;
    + VMA_ITERATOR(vmi, mm, 0);

    - for (vma = mm->mmap; vma; vma = vma->vm_next) {
    + for_each_vma(vmi, vma) {
    if (!vma->vm_file)
    continue;

    diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
    index 6357c3580d07..5dee6c41f36d 100644
    --- a/kernel/events/uprobes.c
    +++ b/kernel/events/uprobes.c
    @@ -356,9 +356,10 @@ static bool valid_ref_ctr_vma(struct uprobe *uprobe,
    static struct vm_area_struct *
    find_ref_ctr_vma(struct uprobe *uprobe, struct mm_struct *mm)
    {
    + VMA_ITERATOR(vmi, mm, 0);
    struct vm_area_struct *tmp;

    - for (tmp = mm->mmap; tmp; tmp = tmp->vm_next)
    + for_each_vma(vmi, tmp)
    if (valid_ref_ctr_vma(uprobe, tmp))
    return tmp;

    @@ -1237,11 +1238,12 @@ int uprobe_apply(struct inode *inode, loff_t offset,

    static int unapply_uprobe(struct uprobe *uprobe, struct mm_struct *mm)
    {
    + VMA_ITERATOR(vmi, mm, 0);
    struct vm_area_struct *vma;
    int err = 0;

    mmap_read_lock(mm);
    - for (vma = mm->mmap; vma; vma = vma->vm_next) {
    + for_each_vma(vmi, vma) {
    unsigned long vaddr;
    loff_t offset;

    @@ -1989,9 +1991,10 @@ bool uprobe_deny_signal(void)

    static void mmf_recalc_uprobes(struct mm_struct *mm)
    {
    + VMA_ITERATOR(vmi, mm, 0);
    struct vm_area_struct *vma;

    - for (vma = mm->mmap; vma; vma = vma->vm_next) {
    + for_each_vma(vmi, vma) {
    if (!valid_vma(vma, false))
    continue;
    /*
    --
    2.34.1
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