goem: Add counts for enomem and pausing
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Authored by imp on May 22 2024, 11:08 PM.

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Reviewers

phk
markj
kib
jhb

Commits

rG32f40fc9837d: geom: Add counts for enomem and pausing

Summary

Add counts for the number of requests that complete with the ENOMEM as
kern.geom.nomem_count and the number of times we pause to let the system
recover kern.geom.pause_count.

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Repository

rG FreeBSD src repository

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Build Status

Buildable 57856
Build 54744: arc lint + arc unit

Event Timeline

imp requested review of this revision.May 22 2024, 11:08 PM

imp created this revision.

Harbormaster completed remote builds in B57856: Diff 138950.May 22 2024, 11:08 PM

imp added a child revision: D45310: cam: Drop periph lock when completing I/O with ENOMEM status.May 22 2024, 11:08 PM

imp added reviewers: phk, markj, kib, jhb.May 22 2024, 11:10 PM

kib added inline comments.May 22 2024, 11:53 PM

sys/geom/geom_io.c
78	u_long?
835	The min() is useless, zero count is converted to 1 tick by pause_sbt()
836	Why is this increment non-atomic?

imp added inline comments.May 23 2024, 3:15 AM

sys/geom/geom_io.c
78	This, or maybe counter_u64_t?
835	I'll do a followup commit.
836	g_down is one thread, no? I could use counters here if I'm wrong about that.

kib added inline comments.May 23 2024, 3:29 AM

sys/geom/geom_io.c
78	These events are exceptional. Counter64 adds non-insignificant memory overhead and fetch complications there, without benefits IMO.
836	ok, the perhaps add a single-line hint about this, please