diff options
| author | Joseph Koshy <jkoshy@FreeBSD.org> | 2005-05-01 14:11:49 +0000 |
|---|---|---|
| committer | Joseph Koshy <jkoshy@FreeBSD.org> | 2005-05-01 14:11:49 +0000 |
| commit | c5153e190bd2410c60a50e108a7a60cde9a3c4bc (patch) | |
| tree | 1e7573a97fa735d4770310305b9ec83d8767f4a7 /share | |
| parent | b60d26c9b930c7b267cd7f7b4b73d4b44d744124 (diff) | |
Notes
Diffstat (limited to 'share')
| -rw-r--r-- | share/man/man4/hwpmc.4 | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/share/man/man4/hwpmc.4 b/share/man/man4/hwpmc.4 index 4a6c8cf5a488..d2f7309da2a3 100644 --- a/share/man/man4/hwpmc.4 +++ b/share/man/man4/hwpmc.4 @@ -287,7 +287,10 @@ system call. Retrieve the MSR (machine specific register) number associated with the given PMC handle. .Pp -This operation is only valid for PMCs allocated in process-private modes. +The PMC needs to be in process-private mode and allocated without the +.Va PMC_F_DESCENDANTS +modifier flag, and should be attached only to its owner process at the +time of the call. .El .Ss amd64 SPECIFIC API AMD64 cpus support the RDPMC instruction which allows a @@ -303,7 +306,10 @@ system call. Retrieve the MSR (machine specific register) number associated with the given PMC handle. .Pp -This operation is only valid for PMCs allocated in process-private modes. +The PMC needs to be in process-private mode and allocated without the +.Va PMC_F_DESCENDANTS +modifier flag, and should be attached only to its owner process at the +time of the call. .El .Sh SYSCTL TUNABLES The behavior of @@ -515,7 +521,10 @@ request contained illegal flags. .It Bq Er EINVAL A .Ic PMC_OP_PMCX86GETMSR -operation was requested for a PMC not in process-virtual mode. +operation was requested for a PMC not in process-virtual mode, or +for a PMC that is not solely attached to its owner process, or for +a PMC that was allocated with flag +.Va PMC_F_DESCENDANTS . .It Bq Er EINVAL (On Intel Pentium 4 CPUs with HTT support) An allocation request for a process-private PMC was issued for an event that does not support @@ -551,6 +560,12 @@ An .Ic PMC_OP_PMCATTACH operation was issued for a target process that the current process does not have permission to attach to. +.It Bq Er EPERM +.Pq "i386 and amd64 architectures" +An +.Ic PMC_OP_PMCATTACH +operation was issued on a PMC whose MSR has been retrieved using +.Ic PMC_OP_PMCX86GETMSR . .It Bq Er ESRCH A process issued a PMC operation request without having allocated any PMCs. .It Bq Er ESRCH |