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geom: Add counts for enomem and pausing
Add counts for the number of requests that complete with the ENOMEM as kern.geom.nomem_count and the number of times we pause the g_down thread to let the system recover as kern.geom.pause_count. Sponsored by: Netflix Reviewed by: kib Differential Revision: https://reviews.freebsd.org/D45309
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@ -75,6 +75,9 @@ static int g_io_transient_map_bio(struct bio *bp);
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static struct g_bioq g_bio_run_down;
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static struct g_bioq g_bio_run_up;
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static u_long nomem_count;
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static u_long pause_count;
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/*
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* Pace is a hint that we've had some trouble recently allocating
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* bios, so we should back off trying to send I/O down the stack
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@ -701,6 +704,7 @@ g_io_deliver(struct bio *bp, int error)
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if (bootverbose)
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printf("ENOMEM %p on %p(%s)\n", bp, pp, pp->name);
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atomic_add_long(&nomem_count, 1); /* Rare event, but no locks held */
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bp->bio_children = 0;
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bp->bio_inbed = 0;
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bp->bio_driver1 = NULL;
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@ -734,6 +738,12 @@ int inflight_transient_maps;
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SYSCTL_INT(_kern_geom, OID_AUTO, inflight_transient_maps, CTLFLAG_RD,
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&inflight_transient_maps, 0,
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"Current count of the active transient maps");
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SYSCTL_ULONG(_kern_geom, OID_AUTO, nomem_count, CTLFLAG_RD,
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&nomem_count, 0,
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"Total count of requests completed with status of ENOMEM");
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SYSCTL_ULONG(_kern_geom, OID_AUTO, pause_count, CTLFLAG_RD,
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&pause_count, 0,
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"Total count of requests stalled due to low memory in g_down");
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static int
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g_io_transient_map_bio(struct bio *bp)
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@ -822,6 +832,7 @@ g_io_schedule_down(struct thread *tp __unused)
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* for that I/O.
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*/
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CTR0(KTR_GEOM, "g_down pacing self");
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pause_count++; /* g_down has only one thread */
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pause("g_down", min(hz/1000, 1));
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pace = 0;
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}
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