From: Suresh Siddha <suresh.b.siddha@intel.com>
To: "H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@elte.hu>,
Thomas Gleixner <tglx@linutronix.de>
Cc: LKML <linux-kernel@vger.kernel.org>,
Suresh Siddha <suresh.b.siddha@intel.com>
Subject: [patch 0/5] x86: xsaveopt kernel enabling patches - v2
Date: Mon, 19 Jul 2010 16:05:47 -0700 [thread overview]
Message-ID: <20100719225747.372816924@sbs-t61.sc.intel.com> (raw)
AVX Programming Reference (June, 2010 version) located at
http://software.intel.com/en-us/avx/ refers to the optimized
extended state save instruction "xsaveopt".
xsaveopt is similar to xsave and incorporates optimizations specifically
targeted for speeding up context switch save, like:
a. if a state is in an INIT state, the instruction may clear the corresponding
bit in the xheader.bv with out writing the actual state in to the memory.
b. if the state hasn't been modified since the last xrstor, the instruction
may not write out the state to the save area.
Following patches enable the use of xsaveopt for context switch save/restore
of the extended state.
changes in v2:
Split the cpu feature detection bits in to multiple patches along with the
misc changes in the init_scattered_cpuid_features() -- Requested by hpa.
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
next reply other threads:[~2010-07-19 23:08 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-19 23:05 Suresh Siddha [this message]
2010-07-19 23:05 ` [patch 1/5] x86: track the offset, size of features state in the xsave layout Suresh Siddha
2010-07-20 1:51 ` [tip:x86/xsave] x86, xsave: Track the offset, size of " tip-bot for Suresh Siddha
2010-07-19 23:05 ` [patch 2/5] x86: sync xsave memory layout with its header for user handling Suresh Siddha
2010-07-20 1:52 ` [tip:x86/xsave] x86, xsave: Sync " tip-bot for Suresh Siddha
2010-07-19 23:05 ` [patch 3/5] x86: extend init_scattered_cpuid_features() to consider cpuid subleaves Suresh Siddha
2010-07-20 0:51 ` [tip:x86/cpu] x86, cpu: Make init_scattered_cpuid_features() " tip-bot for Suresh Siddha
2010-07-19 23:05 ` [patch 4/5] x86: Add xsaveopt cpufeature Suresh Siddha
2010-07-20 0:52 ` [tip:x86/cpu] x86, cpu: " tip-bot for Suresh Siddha
2010-07-19 23:05 ` [patch 5/5] x86: use xsaveopt in context-switch path when supported Suresh Siddha
2010-07-20 0:52 ` [tip:x86/cpu] x86, cpu: Enumerate xsaveopt tip-bot for Suresh Siddha
2010-07-20 1:52 ` [tip:x86/xsave] x86, xsave: Use xsaveopt in context-switch path when supported tip-bot for Suresh Siddha
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