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>
Signed-off-by: Carlos Maiolino <cem@kernel.org>
diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
index a7430fc..106ee81 100644
--- 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;
}
@@ -319,9 +320,11 @@ 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:
@@ -335,6 +338,7 @@ 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 83f894c..e56ba19 100644
--- a/fs/xfs/xfs_trace.h
+++ b/fs/xfs/xfs_trace.h
@@ -692,6 +692,10 @@ 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);
