xfs: trace what memory backs a buffer

Add three trace points for the different backing memory allocators for
buffers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>

diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
index c7f4cafda705580fae2f3f23b8143dd08ce99728..0014cfab3414184edfcdc8b55ed57060bbf83a46 100644 (file)
--- a/fs/xfs/xfs_buf.c
+++ b/fs/xfs/xfs_buf.c
@@ -240,6 +240,7 @@ xfs_buf_alloc_kmem(
                return -ENOMEM;
        }
        bp->b_flags |= _XBF_KMEM;
+       trace_xfs_buf_backing_kmem(bp, _RET_IP_);
        return 0;
 }
 
@@ -315,9 +316,11 @@ xfs_buf_alloc_backing_mem(
        if (!folio) {
                if (size <= PAGE_SIZE)
                        return -ENOMEM;
+               trace_xfs_buf_backing_fallback(bp, _RET_IP_);
                goto fallback;
        }
        bp->b_addr = folio_address(folio);
+       trace_xfs_buf_backing_folio(bp, _RET_IP_);
        return 0;
 
 fallback:
@@ -331,6 +334,7 @@ fallback:
                memalloc_retry_wait(gfp_mask);
        }
 
+       trace_xfs_buf_backing_vmalloc(bp, _RET_IP_);
        return 0;
 }
 

diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h
index bfc2f124902249b28a2bba3f67fdc38d79bb3fb1..4a372404371375d54e19a0112473eafa4aa0a8ad 100644 (file)
--- a/fs/xfs/xfs_trace.h
+++ b/fs/xfs/xfs_trace.h
@@ -545,6 +545,10 @@ DEFINE_BUF_EVENT(xfs_buf_iodone_async);
 DEFINE_BUF_EVENT(xfs_buf_error_relse);
 DEFINE_BUF_EVENT(xfs_buf_drain_buftarg);
 DEFINE_BUF_EVENT(xfs_trans_read_buf_shut);
+DEFINE_BUF_EVENT(xfs_buf_backing_folio);
+DEFINE_BUF_EVENT(xfs_buf_backing_kmem);
+DEFINE_BUF_EVENT(xfs_buf_backing_vmalloc);
+DEFINE_BUF_EVENT(xfs_buf_backing_fallback);
 
 /* not really buffer traces, but the buf provides useful information */
 DEFINE_BUF_EVENT(xfs_btree_corrupt);