From: Christoph Hellwig <hch@lst.de>
Date: Sun, 9 Feb 2025 05:08:20 +0000 (+0100)
Subject: xfs: trace in-memory freecounter reservations
X-Git-Tag: v6.15-rc1~149^2~7^2~5^2~40
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=a0760cca8e1007be7bfa154004e566b2a4fbcd71;p=thirdparty%2Fkernel%2Flinux.git

xfs: trace in-memory freecounter reservations

Add two tracepoints when the freecounter dips into the reserved pool
and when it is entirely out of space.

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

diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index 01f3877840395..a77a2de112788 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -1341,6 +1341,7 @@ xfs_dec_freecounter(
 			goto fdblocks_enospc;
 		}
 		counter->res_avail -= delta;
+		trace_xfs_freecounter_reserved(mp, ctr, delta, _RET_IP_);
 		spin_unlock(&mp->m_sb_lock);
 	}
 
@@ -1348,6 +1349,7 @@ xfs_dec_freecounter(
 	return 0;
 
 fdblocks_enospc:
+	trace_xfs_freecounter_enospc(mp, ctr, delta, _RET_IP_);
 	spin_unlock(&mp->m_sb_lock);
 	return -ENOSPC;
 }
diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h
index f97129f01b48e..dc4d3e913b172 100644
--- a/fs/xfs/xfs_trace.h
+++ b/fs/xfs/xfs_trace.h
@@ -5669,6 +5669,45 @@ TRACE_EVENT(xfs_growfs_check_rtgeom,
 );
 #endif /* CONFIG_XFS_RT */
 
+TRACE_DEFINE_ENUM(XC_FREE_BLOCKS);
+TRACE_DEFINE_ENUM(XC_FREE_RTEXTENTS);
+
+DECLARE_EVENT_CLASS(xfs_freeblocks_resv_class,
+	TP_PROTO(struct xfs_mount *mp, enum xfs_free_counter ctr,
+		 uint64_t delta, unsigned long caller_ip),
+	TP_ARGS(mp, ctr, delta, caller_ip),
+	TP_STRUCT__entry(
+		__field(dev_t, dev)
+		__field(enum xfs_free_counter, ctr)
+		__field(uint64_t, delta)
+		__field(uint64_t, avail)
+		__field(uint64_t, total)
+		__field(unsigned long, caller_ip)
+	),
+	TP_fast_assign(
+		__entry->dev = mp->m_super->s_dev;
+		__entry->ctr = ctr;
+		__entry->delta = delta;
+		__entry->avail = mp->m_free[ctr].res_avail;
+		__entry->total = mp->m_free[ctr].res_total;
+		__entry->caller_ip = caller_ip;
+	),
+	TP_printk("dev %d:%d ctr %s delta %llu avail %llu total %llu caller %pS",
+		  MAJOR(__entry->dev), MINOR(__entry->dev),
+		  __print_symbolic(__entry->ctr, XFS_FREECOUNTER_STR),
+		  __entry->delta,
+		  __entry->avail,
+		  __entry->total,
+		  (char *)__entry->caller_ip)
+)
+#define DEFINE_FREEBLOCKS_RESV_EVENT(name) \
+DEFINE_EVENT(xfs_freeblocks_resv_class, name, \
+	TP_PROTO(struct xfs_mount *mp, enum xfs_free_counter ctr, \
+		 uint64_t delta, unsigned long caller_ip), \
+	TP_ARGS(mp, ctr, delta, caller_ip))
+DEFINE_FREEBLOCKS_RESV_EVENT(xfs_freecounter_reserved);
+DEFINE_FREEBLOCKS_RESV_EVENT(xfs_freecounter_enospc);
+
 #endif /* _TRACE_XFS_H */
 
 #undef TRACE_INCLUDE_PATH