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authorSverker Eriksson <sverker@erlang.org>2016-04-12 20:41:58 +0200
committerSverker Eriksson <sverker@erlang.org>2016-04-15 19:02:49 +0200
commit85a6623152988c267cea008d20616b61ea9c223c (patch)
treec83b93cb1ca5e3f396c62bd4cb7f723d97c9221e /erts/doc
parent90641d82a4b07e6b0be142d07ac85107b8ebee9d (diff)
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erts: Add 'exec_alloc' for hipe code
that uses its own super carrier (erts_exec_mmapper) to guarantee low addressed and executable memory (PROT_EXEC). Currently only used on x86_64 that needs low memory for HiPE/AMD64's small code model. By initializing erts_exec_mapper early we secure its low memory area before erts_literal_mmapper might steal it.
Diffstat (limited to 'erts/doc')
-rw-r--r--erts/doc/src/erts_alloc.xml18
1 files changed, 16 insertions, 2 deletions
diff --git a/erts/doc/src/erts_alloc.xml b/erts/doc/src/erts_alloc.xml
index 0965f9b49c..c54082f8c8 100644
--- a/erts/doc/src/erts_alloc.xml
+++ b/erts/doc/src/erts_alloc.xml
@@ -63,6 +63,9 @@
<tag><c>fix_alloc</c></tag>
<item>A fast allocator used for some frequently used
fixed size data types.</item>
+ <tag><c>exec_alloc</c></tag>
+ <item>Allocator used by hipe for native executable code
+ on specific architectures (x86_64).</item>
<tag><c>std_alloc</c></tag>
<item>Allocator used for most memory blocks not allocated via any of
the other allocators described above.</item>
@@ -80,7 +83,8 @@
the number of system calls made.</item>
</taglist>
<p><c>sys_alloc</c> and <c>literal_alloc</c> are always enabled and
- cannot be disabled. <c>mseg_alloc</c> is always enabled if it is
+ cannot be disabled. <c>exec_alloc</c> is only available if it is needed
+ and cannot be disabled. <c>mseg_alloc</c> is always enabled if it is
available and an allocator that uses it is enabled. All other
allocators can be <seealso marker="#M_e">enabled or disabled</seealso>.
By default all allocators are enabled.
@@ -248,16 +252,17 @@
the currently present allocators:</p>
<list type="bulleted">
<item><c>B: binary_alloc</c></item>
- <item><c>I: literal_alloc</c></item>
<item><c>D: std_alloc</c></item>
<item><c>E: ets_alloc</c></item>
<item><c>F: fix_alloc</c></item>
<item><c>H: eheap_alloc</c></item>
+ <item><c>I: literal_alloc</c></item>
<item><c>L: ll_alloc</c></item>
<item><c>M: mseg_alloc</c></item>
<item><c>R: driver_alloc</c></item>
<item><c>S: sl_alloc</c></item>
<item><c>T: temp_alloc</c></item>
+ <item><c>X: exec_alloc</c></item>
<item><c>Y: sys_alloc</c></item>
</list>
<p>The following flags are available for configuration of
@@ -576,6 +581,15 @@
and is usually sufficient. The flag is ignored on 32-bit
architectures.</item>
</taglist>
+ <p>The following flag is special for <c>exec_alloc</c>:</p>
+ <taglist>
+ <tag><marker id="MIscs"/><c><![CDATA[+MXscs <size in MB>]]></c></tag>
+ <item>
+ <c>exec_alloc</c> super carrier size (in MB). The amount of
+ <em>virtual</em> address space reserved for native executable code
+ used by hipe on specific architectures (x86_64). The default is 512 MB.
+ </item>
+ </taglist>
<p>Instrumentation flags:</p>
<taglist>
<tag><marker id="Mim"/><c>+Mim true|false</c></tag>