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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>
This commit is contained in:
Christoph Hellwig 2025-02-09 06:08:20 +01:00
parent c8c4e8bc69
commit a0760cca8e
2 changed files with 41 additions and 0 deletions
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2
fs/xfs/xfs_mount.c
View File

@ -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;
}

39
fs/xfs/xfs_trace.h
View File

@ -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