svn commit: r327752 - head/sys/kern
John Baldwin
jhb at FreeBSD.org
Tue Jan 9 23:57:30 UTC 2018
Author: jhb
Date: Tue Jan 9 23:57:29 2018
New Revision: 327752
URL: https://svnweb.freebsd.org/changeset/base/327752
Log:
Add a counter to track in-flight AIO requests using unmapped I/O.
MFC after: 2 weeks
Sponsored by: Chelsio Communications
Modified:
head/sys/kern/vfs_aio.c
Modified: head/sys/kern/vfs_aio.c
==============================================================================
--- head/sys/kern/vfs_aio.c Tue Jan 9 22:48:13 2018 (r327751)
+++ head/sys/kern/vfs_aio.c Tue Jan 9 23:57:29 2018 (r327752)
@@ -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;
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