STINNER Victor <vstin...@redhat.com> added the comment:
Ah, the cpuid command tells me "bytes required by XSAVE/XRSTOR area = 1088":
CPU 0:
vendor_id = "GenuineIntel"
version information (1/eax):
processor type = primary processor (0)
family = Intel Pentium Pro/II/III/Celeron/Core/Core 2/Atom, AMD
Athlon/Duron, Cyrix M2, VIA C3 (6)
model = 0xe (14)
stepping id = 0x3 (3)
extended family = 0x0 (0)
extended model = 0x5 (5)
(simple synth) = Intel Core i3-6000 / i5-6000 / i7-6000 / Pentium G4000
/ Celeron G3900 / Xeon E3-1200 (Skylake), 14nm
...
feature information (1/edx):
FXSAVE/FXRSTOR = true
...
feature information (1/ecx):
XSAVE/XSTOR states = true
OS-enabled XSAVE/XSTOR = true
...
XSAVE features (0xd/0):
bytes required by XSAVE/XRSTOR area = 0x00000440 (1088)
...
XSAVE features (0xd/1):
XSAVEOPT instruction = true
XSAVEC instruction = true
XSAVES/XRSTORS instructions = true
...
/proc/cpuinfo also says:
flags : ... xsave avx ... xsaveopt xsavec xgetbv1 xsaves ...
I recall that the Linux kernel was modified to only save AVX registers if a
program uses AVX. So the process state size depends on the usage of AVX. But I
cannot find the related LWN article.
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