ssl: Add upper limit for session cache

If upper limit is reached invalidate the current cache entries, e.i the session
lifetime is the max time a session will be keept, but it may be invalidated
earlier if the max limit for the table is reached. This will keep the ssl
manager process well behaved, not exhusting memeory. Invalidating the entries
will incrementally empty the cache to make room for fresh sessions entries.

1 files changed, 8 insertions, 1 deletions

diff --git a/lib/ssl/doc/src/ssl_app.xml b/lib/ssl/doc/src/ssl_app.xml
index 51ce0cedf1..257175a33f 100644
--- a/lib/ssl/doc/src/ssl_app.xml
+++ b/lib/ssl/doc/src/ssl_app.xml
@@ -66,7 +66,7 @@
       to <c>ssl:connect/[2,3]</c> and <c>ssl:listen/2</c>.</p></item>
 
       <tag><c><![CDATA[session_lifetime = integer() <optional>]]></c></tag>
-      <item><p>Lifetime of the session data in seconds.</p></item>
+      <item><p>Maximum lifetime of the session data in seconds.</p></item>
 
       <tag><c><![CDATA[session_cb = atom() <optional>]]></c></tag>
       <item><p>Name of the session cache callback module that implements
@@ -77,6 +77,13 @@
 
       <item><p>List of extra user-defined arguments to the <c>init</c> function
       in the session cache callback module. Defaults to <c>[]</c>.</p></item>
+
+      <tag><c><![CDATA[session_cache_client_max = integer() <optional>]]></c></tag>
+      <tag><c><![CDATA[session_cache_server_max = integer() <optional>]]></c></tag>
+      <item><p>Limits the growth of the clients/servers session cache,
+      if the maximum number of sessions is reached, the current cache entries will
+      be invalidated regardless of their remaining lifetime. Defaults to 1000.
+      </p></item>
       
       <tag><c><![CDATA[ssl_pem_cache_clean = integer() <optional>]]></c></tag>
       <item>