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writeback: add tracepoints for cgroup foreign writebacks

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cgroup foreign inode handling has quite a bit of heuristics and
internal states which sometimes makes it difficult to understand
what's going on.  Add tracepoints to improve visibility.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Tejun Heo
2019-08-29 15:47:19 -07:00
committed by Jens Axboe
parent e916ad29d9
commit 3a8e9ac89e
3 changed files with 133 additions and 0 deletions
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123
include/trace/events/writeback.h
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@@ -176,6 +176,129 @@ static inline unsigned int __trace_wbc_assign_cgroup(struct writeback_control *w
#endif /* CONFIG_CGROUP_WRITEBACK */
#endif /* CREATE_TRACE_POINTS */
#ifdef CONFIG_CGROUP_WRITEBACK
TRACE_EVENT(inode_foreign_history,
TP_PROTO(struct inode *inode, struct writeback_control *wbc,
unsigned int history),
TP_ARGS(inode, wbc, history),
TP_STRUCT__entry(
__array(char, name, 32)
__field(unsigned long, ino)
__field(unsigned int, cgroup_ino)
__field(unsigned int, history)
),
TP_fast_assign(
strncpy(__entry->name, dev_name(inode_to_bdi(inode)->dev), 32);
__entry->ino = inode->i_ino;
__entry->cgroup_ino = __trace_wbc_assign_cgroup(wbc);
__entry->history = history;
),
TP_printk("bdi %s: ino=%lu cgroup_ino=%u history=0x%x",
__entry->name,
__entry->ino,
__entry->cgroup_ino,
__entry->history
)
);
TRACE_EVENT(inode_switch_wbs,
TP_PROTO(struct inode *inode, struct bdi_writeback *old_wb,
struct bdi_writeback *new_wb),
TP_ARGS(inode, old_wb, new_wb),
TP_STRUCT__entry(
__array(char, name, 32)
__field(unsigned long, ino)
__field(unsigned int, old_cgroup_ino)
__field(unsigned int, new_cgroup_ino)
),
TP_fast_assign(
strncpy(__entry->name, dev_name(old_wb->bdi->dev), 32);
__entry->ino = inode->i_ino;
__entry->old_cgroup_ino = __trace_wb_assign_cgroup(old_wb);
__entry->new_cgroup_ino = __trace_wb_assign_cgroup(new_wb);
),
TP_printk("bdi %s: ino=%lu old_cgroup_ino=%u new_cgroup_ino=%u",
__entry->name,
__entry->ino,
__entry->old_cgroup_ino,
__entry->new_cgroup_ino
)
);
TRACE_EVENT(track_foreign_dirty,
TP_PROTO(struct page *page, struct bdi_writeback *wb),
TP_ARGS(page, wb),
TP_STRUCT__entry(
__array(char, name, 32)
__field(u64, bdi_id)
__field(unsigned long, ino)
__field(unsigned int, memcg_id)
__field(unsigned int, cgroup_ino)
__field(unsigned int, page_cgroup_ino)
),
TP_fast_assign(
strncpy(__entry->name, dev_name(wb->bdi->dev), 32);
__entry->bdi_id = wb->bdi->id;
__entry->ino = page->mapping->host->i_ino;
__entry->memcg_id = wb->memcg_css->id;
__entry->cgroup_ino = __trace_wb_assign_cgroup(wb);
__entry->page_cgroup_ino = page->mem_cgroup->css.cgroup->kn->id.ino;
),
TP_printk("bdi %s[%llu]: ino=%lu memcg_id=%u cgroup_ino=%u page_cgroup_ino=%u",
__entry->name,
__entry->bdi_id,
__entry->ino,
__entry->memcg_id,
__entry->cgroup_ino,
__entry->page_cgroup_ino
)
);
TRACE_EVENT(flush_foreign,
TP_PROTO(struct bdi_writeback *wb, unsigned int frn_bdi_id,
unsigned int frn_memcg_id),
TP_ARGS(wb, frn_bdi_id, frn_memcg_id),
TP_STRUCT__entry(
__array(char, name, 32)
__field(unsigned int, cgroup_ino)
__field(unsigned int, frn_bdi_id)
__field(unsigned int, frn_memcg_id)
),
TP_fast_assign(
strncpy(__entry->name, dev_name(wb->bdi->dev), 32);
__entry->cgroup_ino = __trace_wb_assign_cgroup(wb);
__entry->frn_bdi_id = frn_bdi_id;
__entry->frn_memcg_id = frn_memcg_id;
),
TP_printk("bdi %s: cgroup_ino=%u frn_bdi_id=%u frn_memcg_id=%u",
__entry->name,
__entry->cgroup_ino,
__entry->frn_bdi_id,
__entry->frn_memcg_id
)
);
#endif
DECLARE_EVENT_CLASS(writeback_write_inode_template,
TP_PROTO(struct inode *inode, struct writeback_control *wbc),