Count and export the number of prefaulting happen.
MFC after: 1 month
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parent
b82bd838f6
commit
bb2f52a61d
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=236516
@ -56,6 +56,7 @@ __FBSDID("$FreeBSD$");
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#include <sys/filio.h>
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#include <sys/resourcevar.h>
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#include <sys/sx.h>
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#include <sys/sysctl.h>
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#include <sys/ttycom.h>
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#include <sys/conf.h>
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#include <sys/syslog.h>
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@ -696,6 +697,9 @@ vn_write(fp, uio, active_cred, flags, td)
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}
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static const int io_hold_cnt = 16;
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static unsigned long vn_io_faults_cnt;
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SYSCTL_LONG(_debug, OID_AUTO, vn_io_faults, CTLFLAG_RD,
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&vn_io_faults_cnt, 0, "Count of vn_io_fault lock avoidance triggers");
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/*
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* The vn_io_fault() is a wrapper around vn_read() and vn_write() to
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@ -793,6 +797,7 @@ vn_io_fault(struct file *fp, struct uio *uio, struct ucred *active_cred,
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if (error != EFAULT)
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goto out;
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atomic_add_long(&vn_io_faults_cnt, 1);
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uio_clone->uio_segflg = UIO_NOCOPY;
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uiomove(NULL, resid - uio->uio_resid, uio_clone);
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uio_clone->uio_segflg = uio->uio_segflg;
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