diff options
| author | Song Liu <[email protected]> | 2019-09-23 15:38:33 -0700 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2019-09-24 15:54:11 -0700 |
| commit | f385cb85a42fc4ba92464c2bfd2e2049d65353d3 (patch) | |
| tree | ecbb1588dd56f195f28fd76740e384096284e1dd | |
| parent | 27e1f8273113adec0e98bf513e4091636b27cc2a (diff) | |
uprobe: collapse THP pmd after removing all uprobes
After all uprobes are removed from the huge page (with PTE pgtable), it is
possible to collapse the pmd and benefit from THP again. This patch does
the collapse by calling collapse_pte_mapped_thp().
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Song Liu <[email protected]>
Acked-by: Kirill A. Shutemov <[email protected]>
Reported-by: kbuild test robot <[email protected]>
Reviewed-by: Oleg Nesterov <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
| -rw-r--r-- | kernel/events/uprobes.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index 27b596f14463..94d38a39d72e 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -26,6 +26,7 @@ #include <linux/percpu-rwsem.h> #include <linux/task_work.h> #include <linux/shmem_fs.h> +#include <linux/khugepaged.h> #include <linux/uprobes.h> @@ -472,6 +473,7 @@ int uprobe_write_opcode(struct arch_uprobe *auprobe, struct mm_struct *mm, struct page *old_page, *new_page; struct vm_area_struct *vma; int ret, is_register, ref_ctr_updated = 0; + bool orig_page_huge = false; is_register = is_swbp_insn(&opcode); uprobe = container_of(auprobe, struct uprobe, arch); @@ -529,6 +531,9 @@ retry: /* let go new_page */ put_page(new_page); new_page = NULL; + + if (PageCompound(orig_page)) + orig_page_huge = true; } put_page(orig_page); } @@ -547,6 +552,10 @@ put_old: if (ret && is_register && ref_ctr_updated) update_ref_ctr(uprobe, mm, -1); + /* try collapse pmd for compound page */ + if (!ret && orig_page_huge) + collapse_pte_mapped_thp(mm, vaddr); + return ret; } |