On Wed, Feb 26, 2025 at 07:51:40AM -0800, Christoph Hellwig wrote:
> Add three trace points for the different backing memory allocators for
> buffers.
>
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: "Darrick J. Wong" <djwong@xxxxxxxxxx>
--D
> ---
> fs/xfs/xfs_buf.c | 4 ++++
> fs/xfs/xfs_trace.h | 4 ++++
> 2 files changed, 8 insertions(+)
>
> diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
> index 0393dd302cf6..a396b628e9b0 100644
> --- a/fs/xfs/xfs_buf.c
> +++ b/fs/xfs/xfs_buf.c
> @@ -299,6 +299,7 @@ xfs_buf_alloc_kmem(
> return -ENOMEM;
> }
> bp->b_flags |= _XBF_KMEM;
> + trace_xfs_buf_backing_kmem(bp, _RET_IP_);
> return 0;
> }
>
> @@ -379,9 +380,11 @@ 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:
> @@ -395,6 +398,7 @@ xfs_buf_alloc_backing_mem(
> 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 b29462363b81..c8f64daf6d75 100644
> --- 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);
> --
> 2.45.2
>
>
