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authorMatthew Wilcox (Oracle) <willy@infradead.org>2022-09-06 22:48:58 +0300
committerAndrew Morton <akpm@linux-foundation.org>2022-09-27 05:46:22 +0300
commitfcb72a585aaa4caced555e98f8444e6162912cb7 (patch)
tree1d69d3f4694fb5b8cb8a946874dc9cf2a538c17e /kernel
parent160c820023bbfe7c478ed3041cc50604d664f047 (diff)
downloadlinux-fcb72a585aaa4caced555e98f8444e6162912cb7.tar.xz
perf: use VMA iterator
The VMA iterator is faster than the linked list and removing the linked list will shrink the vm_area_struct. Link: https://lkml.kernel.org/r/20220906194824.2110408-48-Liam.Howlett@oracle.com 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> Reviewed-by: Davidlohr Bueso <dave@stgolabs.net> Tested-by: Yu Zhao <yuzhao@google.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: David Hildenbrand <david@redhat.com> Cc: David Howells <dhowells@redhat.com> Cc: SeongJae Park <sj@kernel.org> Cc: Sven Schnelle <svens@linux.ibm.com> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/events/core.c3
-rw-r--r--kernel/events/uprobes.c9
2 files changed, 8 insertions, 4 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 2621fd24ad26..101c5912c3fc 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -10229,8 +10229,9 @@ 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 2eaa327f8158..401bc2d24ce0 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -349,9 +349,10 @@ 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;
@@ -1231,11 +1232,12 @@ 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;
@@ -1983,9 +1985,10 @@ 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;
/*