Add system_info(atom_limit)

Add system_info(atom_limit) to provide a way to retrieve the maximum
number of atoms allowed. Add tests and documentation for it too.

Also split system_info_SUITE:start_node/2 to start_node_ets/2 and
start_node_atm/2 to avoid code duplication.

1 files changed, 18 insertions, 6 deletions

diff --git a/erts/doc/src/erlang.xml b/erts/doc/src/erlang.xml
index b0d25389fd..43a3481351 100644
--- a/erts/doc/src/erlang.xml
+++ b/erts/doc/src/erlang.xml
@@ -7185,13 +7185,14 @@ ok
               <c>erlang:system_info({allocator,
               <anno>Alloc</anno>})</c></seealso>.</p>
           </item>
+          
         </taglist>
       </desc>
     </func>
 
     <func>
-      <name name="system_info" arity="1" clause_i="10"/>
       <name name="system_info" arity="1" clause_i="11"/>
+      <name name="system_info" arity="1" clause_i="12"/>
       <fsummary>Information about the CPU topology of the system.</fsummary>
       <type name="cpu_topology"/>
       <type name="level_entry"/>
@@ -7291,12 +7292,12 @@ ok
     </func>
 
     <func>
-      <name name="system_info" arity="1" clause_i="27"/>
       <name name="system_info" arity="1" clause_i="28"/>
-      <name name="system_info" arity="1" clause_i="36"/>
+      <name name="system_info" arity="1" clause_i="29"/>
       <name name="system_info" arity="1" clause_i="37"/>
       <name name="system_info" arity="1" clause_i="38"/>
       <name name="system_info" arity="1" clause_i="39"/>
+      <name name="system_info" arity="1" clause_i="40"/>
       <fsummary>Information about the default process heap settings.</fsummary>
       <type name="message_queue_data"/>
       <type name="max_heap_size"/>
@@ -7373,7 +7374,7 @@ ok
       <name name="system_info" arity="1" clause_i="7"/>
       <name name="system_info" arity="1" clause_i="8"/>
       <name name="system_info" arity="1" clause_i="9"/>
-      <name name="system_info" arity="1" clause_i="12"/>
+      <name name="system_info" arity="1" clause_i="10"/>
       <name name="system_info" arity="1" clause_i="13"/>
       <name name="system_info" arity="1" clause_i="14"/>
       <name name="system_info" arity="1" clause_i="15"/>
@@ -7388,14 +7389,14 @@ ok
       <name name="system_info" arity="1" clause_i="24"/>
       <name name="system_info" arity="1" clause_i="25"/>
       <name name="system_info" arity="1" clause_i="26"/>
-      <name name="system_info" arity="1" clause_i="29"/>
+      <name name="system_info" arity="1" clause_i="27"/>
       <name name="system_info" arity="1" clause_i="30"/>
       <name name="system_info" arity="1" clause_i="31"/>
       <name name="system_info" arity="1" clause_i="32"/>
       <name name="system_info" arity="1" clause_i="33"/>
       <name name="system_info" arity="1" clause_i="34"/>
       <name name="system_info" arity="1" clause_i="35"/>
-      <name name="system_info" arity="1" clause_i="40"/>
+      <name name="system_info" arity="1" clause_i="36"/>
       <name name="system_info" arity="1" clause_i="41"/>
       <name name="system_info" arity="1" clause_i="42"/>
       <name name="system_info" arity="1" clause_i="43"/>
@@ -7425,6 +7426,7 @@ ok
       <name name="system_info" arity="1" clause_i="67"/>
       <name name="system_info" arity="1" clause_i="68"/>
       <name name="system_info" arity="1" clause_i="69"/>
+      <name name="system_info" arity="1" clause_i="70"/>
       <fsummary>Information about the system.</fsummary>
       <desc>
         <p>Returns various information about the current system
@@ -7436,6 +7438,16 @@ ok
             <p>See <seealso marker="#system_info_allocator_tags">
               above</seealso>.</p>
           </item>
+          <tag><c>atom_limit</c></tag>
+          <item>
+            <marker id="system_info_atom_limit"></marker>
+            <p>Returns the maximum number of atoms allowed.
+              This limit can be increased at startup by passing
+              command-line flag
+              <seealso marker="erts:erl#+t"><c>+t</c></seealso> to
+              <c>erl(1)</c>. 
+            </p>
+          </item>
           <tag><c>build_type</c></tag>
           <item>
             <p>Returns an atom describing the build type of the runtime