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@xxxxxx>
Reviewed-by: "Darrick J. Wong" <djwong@xxxxxxxxxx>
---
fs/xfs/xfs_mount.c | 2 ++
fs/xfs/xfs_trace.h | 39 +++++++++++++++++++++++++++++++++++++++
2 files changed, 41 insertions(+)
diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index 097e7315ba66..6b80fd55c787 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -1344,6 +1344,7 @@ 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);
}
@@ -1351,6 +1352,7 @@ 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 7fdcb519cf2f..cdaf8fdf6310 100644
--- a/fs/xfs/xfs_trace.h
+++ b/fs/xfs/xfs_trace.h
@@ -5668,6 +5668,45 @@ 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
--
2.45.2
