Currently smaps reports many zero fields for vma(VM_HUGETLB), which is
inconvenient when we want to know per-task or per-vma base hugetlb usage.
This patch enables these fields by introducing smaps_hugetlb_range().
before patch:
Size: 20480 kB
Rss: 0 kB
Pss: 0 kB
Shared_Clean: 0 kB
Shared_Dirty: 0 kB
Private_Clean: 0 kB
Private_Dirty: 0 kB
Referenced: 0 kB
Anonymous: 0 kB
AnonHugePages: 0 kB
Swap: 0 kB
KernelPageSize: 2048 kB
MMUPageSize: 2048 kB
Locked: 0 kB
VmFlags: rd wr mr mw me de ht
after patch:
Size: 20480 kB
Rss: 18432 kB
Pss: 18432 kB
Shared_Clean: 0 kB
Shared_Dirty: 0 kB
Private_Clean: 0 kB
Private_Dirty: 18432 kB
Referenced: 18432 kB
Anonymous: 18432 kB
AnonHugePages: 0 kB
Swap: 0 kB
KernelPageSize: 2048 kB
MMUPageSize: 2048 kB
Locked: 0 kB
VmFlags: rd wr mr mw me de ht
Signed-off-by: Naoya Horiguchi <n-horigu...@ah.jp.nec.com>
Acked-by: Jörn Engel <jo...@logfs.org>
---
fs/proc/task_mmu.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git v4.2-rc4.orig/fs/proc/task_mmu.c v4.2-rc4/fs/proc/task_mmu.c
index ca1e091881d4..c7218603306d 100644
--- v4.2-rc4.orig/fs/proc/task_mmu.c
+++ v4.2-rc4/fs/proc/task_mmu.c
@@ -610,12 +610,39 @@ static void show_smap_vma_flags(struct seq_file *m,
struct vm_area_struct *vma)
seq_putc(m, '\n');
}
+#ifdef CONFIG_HUGETLB_PAGE
+static int smaps_hugetlb_range(pte_t *pte, unsigned long hmask,
+ unsigned long addr, unsigned long end,
+ struct mm_walk *walk)
+{
+ struct mem_size_stats *mss = walk->private;
+ struct vm_area_struct *vma = walk->vma;
+ struct page *page = NULL;
+
+ if (pte_present(*pte)) {
+ page = vm_normal_page(vma, addr, *pte);
+ } else if (is_swap_pte(*pte)) {
+ swp_entry_t swpent = pte_to_swp_entry(*pte);
+
+ if (is_migration_entry(swpent))
+ page = migration_entry_to_page(swpent);
+ }
+ if (page)
+ smaps_account(mss, page, huge_page_size(hstate_vma(vma)),
+ pte_young(*pte), pte_dirty(*pte));
+ return 0;
+}
+#endif /* HUGETLB_PAGE */
+
static int show_smap(struct seq_file *m, void *v, int is_pid)
{
struct vm_area_struct *vma = v;
struct mem_size_stats mss;
struct mm_walk smaps_walk = {
.pmd_entry = smaps_pte_range,
+#ifdef CONFIG_HUGETLB_PAGE
+ .hugetlb_entry = smaps_hugetlb_range,
+#endif
.mm = vma->vm_mm,
.private = &mss,
};
--
2.4.3
