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ANDROID: mm: page_pinner: add more struct page fields

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While I was investigating CMA allocation latency, adding fields below
were very useful to detect the CMA allocation latency issues.
This patch adds following fields of struct page.

for struct page:

  int count
  int mapcount
  struct address_space

This patch removes page_mt since it was not useful ever for me.

Bug: 192475091
Signed-off-by: Minchan Kim <minchan@google.com>
Change-Id: I312505901a227cd404555f845550d2a9c9ce89da
This commit is contained in:
Minchan Kim
2021-07-11 12:43:11 -07:00
parent 0445b67bee
commit 3254948484
1 changed files with 14 additions and 7 deletions
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21
mm/page_pinner.c
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@@ -29,9 +29,13 @@ struct captured_pinner {
s64 ts_usec; s64 ts_usec;
s64 elapsed; s64 elapsed;
}; };
int page_mt;
unsigned long page_flags; /* struct page fields */
unsigned long pfn; unsigned long pfn;
int count;
int mapcount;
struct address_space *mapping;
unsigned long flags;
}; };
struct longterm_pinner { struct longterm_pinner {
@@ -117,9 +121,11 @@ static noinline depot_stack_handle_t save_stack(gfp_t flags)
static void capture_page_state(struct page *page, static void capture_page_state(struct page *page,
struct captured_pinner *record) struct captured_pinner *record)
{ {
record->page_flags = page->flags; record->flags = page->flags;
record->page_mt = get_pageblock_migratetype(page); record->mapping = page_mapping(page);
record->pfn = page_to_pfn(page); record->pfn = page_to_pfn(page);
record->count = page_count(page);
record->mapcount = page_mapcount(page);
} }
static void check_longterm_pin(struct page_pinner *page_pinner, static void check_longterm_pin(struct page_pinner *page_pinner,
@@ -238,11 +244,12 @@ print_page_pinner(bool longterm, char __user *buf, size_t count, struct captured
/* Print information relevant to grouping pages by mobility */ /* Print information relevant to grouping pages by mobility */
ret += snprintf(kbuf + ret, count - ret, ret += snprintf(kbuf + ret, count - ret,
"PFN %lu Block %lu type %s Flags %#lx(%pGp)\n", "PFN 0x%lx Block %lu count %d mapcount %d mapping %pS Flags %#lx(%pGp)\n",
record->pfn, record->pfn,
record->pfn >> pageblock_order, record->pfn >> pageblock_order,
migratetype_names[record->page_mt], record->count, record->mapcount,
record->page_flags, &record->page_flags); record->mapping,
record->flags, &record->flags);
if (ret >= count) if (ret >= count)
goto err; goto err;