Author: jhb
Date: Tue Jan 30 00:10:00 2018
New Revision: 328575
URL: https://svnweb.freebsd.org/changeset/base/328575
Log:
MFC 327752: Add a counter to track in-flight AIO requests using unmapped I/O.
Sponsored by: Chelsio Communications
Modified:
stable/11/sys/kern/vfs_aio.c
Directory Properties:
stable/11/ (props changed)
Modified: stable/11/sys/kern/vfs_aio.c
==============================================================================
--- stable/11/sys/kern/vfs_aio.c Tue Jan 30 00:01:16 2018
(r328574)
+++ stable/11/sys/kern/vfs_aio.c Tue Jan 30 00:10:00 2018
(r328575)
@@ -148,6 +148,11 @@ 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. */
@@ -2367,7 +2373,8 @@ 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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