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filemap: Convert tracing of page cache operations to folio 

Pass the folio instead of a page.  The page was already implicitly a
folio as it accessed page->mapping directly.  Add the order of the folio
to the tracepoint, as this is important information.  Also drop printing
the address of the struct page as the pfn provides better information
than the struct page address.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>
This commit is contained in:
Matthew Wilcox (Oracle) 2021-07-23 09:29:46 -04:00
parent 621db4880d
commit a0580c6f9b
2 changed files with 22 additions and 19 deletions
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32
include/trace/events/filemap.h
View File

@ -15,43 +15,45 @@
DECLARE_EVENT_CLASS(mm_filemap_op_page_cache,
TP_PROTO(struct page *page),
TP_PROTO(struct folio *folio),
TP_ARGS(page),
TP_ARGS(folio),
TP_STRUCT__entry(
__field(unsigned long, pfn)
__field(unsigned long, i_ino)
__field(unsigned long, index)
__field(dev_t, s_dev)
__field(unsigned char, order)
),
TP_fast_assign(
__entry->pfn = page_to_pfn(page);
__entry->i_ino = page->mapping->host->i_ino;
__entry->index = page->index;
if (page->mapping->host->i_sb)
__entry->s_dev = page->mapping->host->i_sb->s_dev;
__entry->pfn = folio_pfn(folio);
__entry->i_ino = folio->mapping->host->i_ino;
__entry->index = folio->index;
if (folio->mapping->host->i_sb)
__entry->s_dev = folio->mapping->host->i_sb->s_dev;
else
__entry->s_dev = page->mapping->host->i_rdev;
__entry->s_dev = folio->mapping->host->i_rdev;
__entry->order = folio_order(folio);
),
TP_printk("dev %d:%d ino %lx page=%p pfn=0x%lx ofs=%lu",
TP_printk("dev %d:%d ino %lx pfn=0x%lx ofs=%lu order=%u",
MAJOR(__entry->s_dev), MINOR(__entry->s_dev),
__entry->i_ino,
pfn_to_page(__entry->pfn),
__entry->pfn,
__entry->index << PAGE_SHIFT)
__entry->index << PAGE_SHIFT,
__entry->order)
);
DEFINE_EVENT(mm_filemap_op_page_cache, mm_filemap_delete_from_page_cache,
TP_PROTO(struct page *page),
TP_ARGS(page)
TP_PROTO(struct folio *folio),
TP_ARGS(folio)
);
DEFINE_EVENT(mm_filemap_op_page_cache, mm_filemap_add_to_page_cache,
TP_PROTO(struct page *page),
TP_ARGS(page)
TP_PROTO(struct folio *folio),
TP_ARGS(folio)
);
TRACE_EVENT(filemap_set_wb_err,

9
mm/filemap.c
View File

@ -225,7 +225,7 @@ void __delete_from_page_cache(struct page *page, void *shadow)
struct folio *folio = page_folio(page);
struct address_space *mapping = page->mapping;
trace_mm_filemap_delete_from_page_cache(page);
trace_mm_filemap_delete_from_page_cache(folio);
filemap_unaccount_folio(mapping, folio);
page_cache_delete(mapping, folio, shadow);
@ -346,9 +346,10 @@ void delete_from_page_cache_batch(struct address_space *mapping,
spin_lock(&mapping->host->i_lock);
xa_lock_irq(&mapping->i_pages);
for (i = 0; i < pagevec_count(pvec); i++) {
trace_mm_filemap_delete_from_page_cache(pvec->pages[i]);
struct folio *folio = page_folio(pvec->pages[i]);
filemap_unaccount_folio(mapping, page_folio(pvec->pages[i]));
trace_mm_filemap_delete_from_page_cache(folio);
filemap_unaccount_folio(mapping, folio);
}
page_cache_delete_batch(mapping, pvec);
xa_unlock_irq(&mapping->i_pages);
@ -959,7 +960,7 @@ unlock:
goto error;
}
trace_mm_filemap_add_to_page_cache(&folio->page);
trace_mm_filemap_add_to_page_cache(folio);
return 0;
error:
folio->mapping = NULL;