JDK-8056124 : Hotspot should use PICL interface to get cacheline size on SPARC
- Type: Enhancement
- Component: hotspot
- Sub-Component: compiler
- Affected Version: 7,8u40,9
- Priority: P2
- Status: Resolved
- Resolution: Fixed
- OS: generic
- CPU: sparc
- Submitted: 2014-08-26
- Updated: 2017-08-10
- Resolved: 2014-09-05
The Version table provides details related to the release that this issue/RFE will be addressed.
Unresolved : Release in which this issue/RFE will be addressed.
Resolved: Release in which this issue/RFE has been resolved.
Fixed : Release in which this issue/RFE has been fixed. The release containing this fix may be available for download as an Early Access Release or a General Availability Release.
To download the current JDK release, click here.
Unresolved : Release in which this issue/RFE will be addressed.
Resolved: Release in which this issue/RFE has been resolved.
Fixed : Release in which this issue/RFE has been fixed. The release containing this fix may be available for download as an Early Access Release or a General Availability Release.
To download the current JDK release, click here.
| JDK 7 | JDK 8 | JDK 9 |
|---|---|---|
7u80Fixed  |
8u40Fixed |
9 b32Fixed |
Related Reports
|
Relates :
|
|
|
Relates :
|
|
|
Relates :
|
Description
Currently the cache line size on SPARC is hardcoded into VM:
static intx prefetch_data_size() {
return is_T4() && !is_T7() ? 32 : 64; // default prefetch block size on sparc
}
static bool is_T4() { return is_T_family(_features) && has_cbcond(); }
static bool is_T7() { return is_T_family(_features) && has_sparc5_instr(); }
Where is_T_family() relies on data from kstat library:
} else if (strstr(impl, "SPARC-T") != NULL) {
features |= T_family_m;
Unfortunately in virtual machine kstat may not provide such information (JDK-8035283).
We should use PICL (libpicl.so) interface to get (L2) cache line size on SPARC. I verified that Solaris 10u9, which is jdk7 supported OS, has libpicl.so.
Comments
|