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Add a counter to track in-flight AIO requests using unmapped I/O.

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MFC after:	2 weeks
Sponsored by:	Chelsio Communications
This commit is contained in:
John Baldwin 2018-01-09 23:57:29 +00:00
parent dd5edb11b1
commit 8091e52b42
1 changed files with 8 additions and 1 deletions
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9
sys/kern/vfs_aio.c
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@ -150,6 +150,11 @@ static int num_buf_aio = 0;
SYSCTL_INT(_vfs_aio, OID_AUTO, num_buf_aio, CTLFLAG_RD, &num_buf_aio, 0,
"Number of aio requests presently handled by the buf subsystem");
static int num_unmapped_aio = 0;
SYSCTL_INT(_vfs_aio, OID_AUTO, num_unmapped_aio, CTLFLAG_RD, &num_unmapped_aio,
0,
"Number of aio requests presently handled by unmapped I/O buffers");
/* Number of async I/O processes in the process of being started */
/* XXX This should be local to aio_aqueue() */
static int num_aio_resv_start = 0;
@ -1305,6 +1310,7 @@ aio_qphysio(struct proc *p, struct kaiocb *job)
bp->bio_ma_offset = poff;
bp->bio_data = unmapped_buf;
bp->bio_flags |= BIO_UNMAPPED;
atomic_add_int(&num_unmapped_aio, 1);
}
/* Perform transfer. */
@ -2365,7 +2371,8 @@ aio_physwakeup(struct bio *bp)
AIO_LOCK(ki);
ki->kaio_buffer_count--;
AIO_UNLOCK(ki);
}
} else
atomic_subtract_int(&num_unmapped_aio, 1);
vm_page_unhold_pages(job->pages, job->npages);
bp = job->bp;