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-rw-r--r--erts/doc/src/erlang.xml23
1 files changed, 23 insertions, 0 deletions
diff --git a/erts/doc/src/erlang.xml b/erts/doc/src/erlang.xml
index 2b7a3b85e5..51ebddc155 100644
--- a/erts/doc/src/erlang.xml
+++ b/erts/doc/src/erlang.xml
@@ -776,6 +776,29 @@ Z = erlang:adler32_combine(X,Y,iolist_size(Data2)).</code>
by passing option <c>{allow_gc, false}</c>.</p>
</item>
</taglist>
+ <note>
+ <p>
+ Up until ERTS version 8.*, the check process code operation
+ checks for all types of references to the old code. That is,
+ direct references (e.g. return addresses on the process
+ stack), indirect references (<c>fun</c>s in process
+ context), and references to literals in the code.
+ </p>
+ <p>
+ As of ERTS version 9.0, the check process code operation
+ only checks for direct references to the code. Indirect
+ references via <c>fun</c>s will be ignored. If such
+ <c>fun</c>s exist and are used after a purge of the old
+ code, an exception will be raised upon usage (same as
+ the case when the <c>fun</c> is received by the process
+ after the purge). Literals will be taken care of (copied)
+ at a later stage. This behavior can as of ERTS version
+ 8.1 be enabled when
+ <seealso marker="doc/installation_guide:INSTALL#Advanced-configuration-and-build-of-ErlangOTP_Configuring">building OTP</seealso>,
+ and will automatically be enabled if dirty scheduler
+ support is enabled.
+ </p>
+ </note>
<p>See also <seealso marker="kernel:code">
<c>kernel:code(3)</c></seealso>.</p>
<p>Failures:</p>