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authorRickard Green <[email protected]>2014-09-25 17:05:48 +0200
committerRickard Green <[email protected]>2014-09-25 17:05:48 +0200
commit3e4491cf98d6ec0ff8b10dfdfac8d8c0b7031e61 (patch)
tree1bee4fc91742e3291792caacc61d20a67a80300d /erts/doc/src
parent743ed31108ee555db18d9833186865e85e34333e (diff)
parent6084a42a24fca52a5de2bc487c0cd2be46dcc21f (diff)
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Merge branch 'rickard/eager-check-io/OTP-12117' into rickard/maint-17/eager-check-io/OTP-12117
* rickard/eager-check-io/OTP-12117: Introduce support for eager check I/O scheduling Conflicts: erts/emulator/beam/erl_bif_info.c erts/emulator/beam/erl_init.c erts/emulator/beam/erl_process.c erts/preloaded/ebin/erlang.beam
Diffstat (limited to 'erts/doc/src')
-rw-r--r--erts/doc/src/erl.xml17
-rw-r--r--erts/doc/src/erlang.xml11
2 files changed, 28 insertions, 0 deletions
diff --git a/erts/doc/src/erl.xml b/erts/doc/src/erl.xml
index f856b9ab86..141754e4f9 100644
--- a/erts/doc/src/erl.xml
+++ b/erts/doc/src/erl.xml
@@ -1141,6 +1141,23 @@
<p>For more information, see
<seealso marker="erlang#system_info_cpu_topology">erlang:system_info(cpu_topology)</seealso>.</p>
</item>
+ <tag><marker id="+secio"><c>+secio true|false</c></marker></tag>
+ <item>
+ <p>Enable or disable eager check I/O scheduling. The default
+ is currently <c>false</c>, but will most likely be changed
+ to <c>true</c> in OTP 18. The behaviour before this flag
+ was introduced corresponds to <c>+secio false</c>.</p>
+ <p>The flag effects when schedulers will check for I/O
+ operations possible to execute, and when such I/O operations
+ will execute. As the name of the parameter implies,
+ schedulers will be more eager to check for I/O when
+ <c>true</c> is passed. This however also implies that
+ execution of outstanding I/O operation will not be
+ prioritized to the same extent as when <c>false</c> is
+ passed.</p>
+ <p><seealso marker="erlang#system_info_eager_check_io"><c>erlang:system_info(eager_check_io)</c></seealso>
+ returns the value of this parameter used when starting the VM.</p>
+ </item>
<tag><marker id="+sfwi"><c>+sfwi Interval</c></marker></tag>
<item>
<p>Set scheduler forced wakeup interval. All run queues will
diff --git a/erts/doc/src/erlang.xml b/erts/doc/src/erlang.xml
index 84168397f6..111756407f 100644
--- a/erts/doc/src/erlang.xml
+++ b/erts/doc/src/erlang.xml
@@ -5775,6 +5775,7 @@ ok
<name name="system_info" arity="1" clause_i="52"/>
<name name="system_info" arity="1" clause_i="53"/>
<name name="system_info" arity="1" clause_i="54"/>
+ <name name="system_info" arity="1" clause_i="55"/>
<fsummary>Information about the system</fsummary>
<desc>
<p>Returns various information about the current system
@@ -5970,6 +5971,16 @@ ok
The return value will always be <c>false</c> since
the elib_malloc allocator has been removed.</p>
</item>
+ <tag><marker id="system_info_eager_check_io"><c>eager_check_io</c></marker></tag>
+ <item>
+ <p>
+ Returns the value of the <c>erl</c>
+ <seealso marker="erl#+secio">+secio</seealso> command line
+ flag which is either <c>true</c> or <c>false</c>. See the
+ documentation of the command line flag for information about
+ the different values.
+ </p>
+ </item>
<tag><c>ets_limit</c></tag>
<item>
<p>Returns the maximum number of ETS tables allowed. This limit