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authorSiddhesh Poyarekar <siddhesh@sourceware.org>2017-06-30 22:58:39 +0530
committerSiddhesh Poyarekar <siddhesh@sourceware.org>2017-06-30 22:58:39 +0530
commit28cfa3a48e59f9c6b9bc25a003a4ede435841382 (patch)
treeec2c7a24f4fd2a0d8b4e2ead2dabc36b6b3c3cf9 /sysdeps/aarch64/dl-tunables.list
parentab85da15301c552e3ea4577a6432aa028bee9295 (diff)
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tunables, aarch64: New tunable to override cpu
Add a new tunable (glibc.tune.cpu) to override CPU identification on
aarch64.  This is useful in two cases: one where it is desirable to
pretend to be another CPU for purposes of testing or because routines
written for that CPU are beneficial for specific workloads and second
where the underlying kernel does not support emulation of MRS to get
the MIDR of the CPU.

	* elf/dl-tunables.h (tunable_is_name): Move from...
	* elf/dl-tunables.c (is_name): ... here.
	(parse_tunables, __tunables_init): Adjust.
	* manual/tunables.texi: Document glibc.tune.cpu.
	* sysdeps/aarch64/dl-tunables.list: New file.
	* sysdeps/unix/sysv/linux/aarch64/cpu-features.c (struct
	cpu_list): New type.
	(cpu_list): New list of CPU names and their MIDR.
	(get_midr_from_mcpu): New function.
	(init_cpu_features): Override MIDR if necessary.
Diffstat (limited to 'sysdeps/aarch64/dl-tunables.list')
-rw-r--r--sysdeps/aarch64/dl-tunables.list25
1 files changed, 25 insertions, 0 deletions
diff --git a/sysdeps/aarch64/dl-tunables.list b/sysdeps/aarch64/dl-tunables.list
new file mode 100644
index 0000000000..b1da2bfdfe
--- /dev/null
+++ b/sysdeps/aarch64/dl-tunables.list
@@ -0,0 +1,25 @@
+# aarch64 specific tunables.
+# Copyright (C) 2017 Free Software Foundation, Inc.
+# This file is part of the GNU C Library.
+
+# The GNU C Library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+
+# The GNU C Library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+
+# You should have received a copy of the GNU Lesser General Public
+# License along with the GNU C Library; if not, see
+# <http://www.gnu.org/licenses/>.
+
+glibc {
+  tune {
+    cpu {
+      type: STRING
+    }
+  }
+}