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8e221b6db4
fxsave/xsave doesn't touch all the bytes in the memory layout used by these instructions. Specifically SW reserved (bytes 464..511) fields in the fxsave frame and the reserved fields in the xsave header. To present a clean context for the signal handling, just clear these fields instead of clearing the complete fxsave/xsave memory layout, when we dump these registers directly to the user signal frame. Also avoid the call to second xrstor (which inits the state not passed in the signal frame) in restore_user_xstate() if all the state has already been restored by the first xrstor. These changes improve the performance of signal handling(by ~3-5% as measured by the lat_sig). Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> LKML-Reference: <1277249017.2847.85.camel@sbs-t61.sc.intel.com> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com> |
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| crypto | ||
| ia32 | ||
| include/asm | ||
| kernel | ||
| kvm | ||
| lguest | ||
| lib | ||
| math-emu | ||
| mm | ||
| oprofile | ||
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| tools | ||
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| .gitignore | ||
| Kbuild | ||
| Kconfig | ||
| Kconfig.cpu | ||
| Kconfig.debug | ||
| Makefile | ||
| Makefile_32.cpu | ||