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authorGautam Menghani <gautammenghani201@gmail.com>2022-10-26 08:22:18 +0300
committerAndrew Morton <akpm@linux-foundation.org>2022-12-12 05:12:09 +0300
commit4c9473e87e75a2a77ccd02e55c91ffe6a52b5df6 (patch)
tree535bb62092c43a54d984d8dba689070ca404d5fb /mm/khugepaged.c
parentf7355e99d9f71fcde093193fd4b569a648ba5ce3 (diff)
downloadlinux-4c9473e87e75a2a77ccd02e55c91ffe6a52b5df6.tar.xz
mm/khugepaged: add tracepoint to collapse_file()
"mm_khugepaged_collapse_file" for capturing is_shmem. Currently, is_shmem is not being captured. Capturing is_shmem is useful as it can indicate if tmpfs is being used as a backing store instead of persistent storage. Add the tracepoint in collapse_file() named "mm_khugepaged_collapse_file" for capturing is_shmem. [gautammenghani201@gmail.com: swap is_shmem and addr to save space, per Steven Rostedt] Link: https://lkml.kernel.org/r/20221202201807.182829-1-gautammenghani201@gmail.com Link: https://lkml.kernel.org/r/20221026052218.148234-1-gautammenghani201@gmail.com Signed-off-by: Gautam Menghani <gautammenghani201@gmail.com> Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org> [tracing] Cc: David Hildenbrand <david@redhat.com> Cc: Masami Hiramatsu (Google) <mhiramat@kernel.org> Cc: Yang Shi <shy828301@gmail.com> Cc: Zach O'Keefe <zokeefe@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/khugepaged.c')
-rw-r--r--mm/khugepaged.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 913b0f489352..78ec2771cc65 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -1744,12 +1744,12 @@ static int collapse_file(struct mm_struct *mm, unsigned long addr,
{
struct address_space *mapping = file->f_mapping;
struct page *hpage;
- pgoff_t index, end = start + HPAGE_PMD_NR;
+ pgoff_t index = 0, end = start + HPAGE_PMD_NR;
LIST_HEAD(pagelist);
XA_STATE_ORDER(xas, &mapping->i_pages, start, HPAGE_PMD_ORDER);
int nr_none = 0, result = SCAN_SUCCEED;
bool is_shmem = shmem_file(file);
- int nr;
+ int nr = 0;
VM_BUG_ON(!IS_ENABLED(CONFIG_READ_ONLY_THP_FOR_FS) && !is_shmem);
VM_BUG_ON(start & (HPAGE_PMD_NR - 1));
@@ -2102,7 +2102,8 @@ out:
mem_cgroup_uncharge(page_folio(hpage));
put_page(hpage);
}
- /* TODO: tracepoints */
+
+ trace_mm_khugepaged_collapse_file(mm, hpage, index, is_shmem, addr, file, nr, result);
return result;
}