Date: Tue, 30 Jan 2018 00:10:00 +0000 (UTC) From: John Baldwin <jhb@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r328575 - stable/11/sys/kern Message-ID: <201801300010.w0U0A061074981@repo.freebsd.org>
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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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