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xfs: trace what memory backs a buffer

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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>
This commit is contained in:
Christoph Hellwig 2025-03-10 14:19:15 +01:00 committed by Carlos Maiolino
parent e614a00117
commit 89ce287c83
2 changed files with 8 additions and 0 deletions
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4
fs/xfs/xfs_buf.c
View File

@ -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;
}

4
fs/xfs/xfs_trace.h
View File

@ -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);