Commit a0760cca authored by Christoph Hellwig's avatar Christoph Hellwig
Browse files

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: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatar"Darrick J. Wong" <djwong@kernel.org>
parent c8c4e8bc

fs/xfs/xfs_mount.c

+2 −0
Original line number Diff line number Diff line
@@ -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;

}

fs/xfs/xfs_trace.h

+39 −0
Original line number Diff line number Diff line
@@ -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