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Align x86 TCB to 64 bytes (cache line size), important for Atom.

This commit is contained in:
Roland McGrath 2011-08-14 15:46:52 -07:00
parent 85ae058936
commit 5744c68d78
3 changed files with 26 additions and 7 deletions
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5
nptl/ChangeLog
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@ -1,3 +1,8 @@
2011-08-14 Roland McGrath <roland@hack.frob.com>
* sysdeps/i386/pthreaddef.h (TCB_ALIGNMENT): Set to 64, optimal on Atom.
* sysdeps/x86_64/pthreaddef.h (TCB_ALIGNMENT): Likewise.
2011-08-08 Andreas Schwab <schwab@redhat.com>
* sysdeps/unix/sysv/linux/x86_64/cancellation.S: Maintain aligned

12
nptl/sysdeps/i386/pthreaddef.h
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@ -1,4 +1,4 @@
/* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
/* Copyright (C) 2002,2003,2011 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
@ -27,8 +27,14 @@
/* Minimal stack size after allocating thread descriptor and guard size. */
#define MINIMAL_REST_STACK 2048
/* Alignment requirement for TCB. */
#define TCB_ALIGNMENT 16
/* Alignment requirement for TCB.
Some processors such as Intel Atom pay a big penalty on every
access using a segment override if that segment's base is not
aligned to the size of a cache line. (See Intel 64 and IA-32
Architectures Optimization Reference Manual, section 13.3.3.3,
"Segment Base".) On such machines, a cache line is 64 bytes. */
#define TCB_ALIGNMENT 64
/* Location of current stack frame. */

16
nptl/sysdeps/x86_64/pthreaddef.h
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@ -1,4 +1,4 @@
/* Copyright (C) 2002, 2003, 2007 Free Software Foundation, Inc.
/* Copyright (C) 2002,2003,2007,2011 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
@ -27,9 +27,17 @@
/* Minimal stack size after allocating thread descriptor and guard size. */
#define MINIMAL_REST_STACK 2048
/* Alignment requirement for TCB. Need to store post-AVX vector registers
in the TCB and we want the storage to be aligned at 32-byte. */
#define TCB_ALIGNMENT 32
/* Alignment requirement for TCB.
We need to store post-AVX vector registers in the TCB and we want the
storage to be aligned to at least 32 bytes.
Some processors such as Intel Atom pay a big penalty on every
access using a segment override if that segment's base is not
aligned to the size of a cache line. (See Intel 64 and IA-32
Architectures Optimization Reference Manual, section 13.3.3.3,
"Segment Base".) On such machines, a cache line is 64 bytes. */
#define TCB_ALIGNMENT 64
/* Location of current stack frame. The frame pointer is not usable. */