commit 1e52e8495a074c9d1f7ef17f13b9060b76be6f41
Author: Sergio Lopez <slp@redhat.com>
Date:   Mon Dec 4 09:17:13 2017 +0100

    Document new {set,show} dump-excluded-mappings commands.
    
    gdb/ChangeLog:
    2017-11-29  Sergio Lopez  <slp@redhat.com>
    
            * NEWS (Changes since GDB 8.0): Announce {set,show}
            dump_excluded_mappings commands.
    
    gdb/doc/ChangeLog:
    2017-11-29  Sergio Lopez  <slp@redhat.com>
    
            * gdb.texinfo (gcore): Mention new {set,show}
            dump-excluded-mappings commands.
            (set dump-excluded-mappings): Document new command.

Index: gdb-7.6.1/gdb/NEWS
===================================================================
--- gdb-7.6.1.orig/gdb/NEWS	2017-12-06 20:56:34.005080504 +0100
+++ gdb-7.6.1/gdb/NEWS	2017-12-06 20:56:52.510200234 +0100
@@ -7,6 +7,11 @@
   Add entries to the list of directories from which to load auto-loaded
   scripts.
 
+set dump-excluded-mappings
+show dump-excluded-mappings
+  Control whether mappings marked with the VM_DONTDUMP flag should be
+  dumped when generating a core file.
+
 * Newly installed $prefix/bin/gcore acts as a shell interface for the
   GDB command gcore.
 
Index: gdb-7.6.1/gdb/doc/gdb.texinfo
===================================================================
--- gdb-7.6.1.orig/gdb/doc/gdb.texinfo	2017-12-06 20:56:30.604058498 +0100
+++ gdb-7.6.1/gdb/doc/gdb.texinfo	2017-12-06 20:56:34.015080568 +0100
@@ -10318,7 +10318,9 @@
 
 On @sc{gnu}/Linux, this command can take into account the value of the
 file @file{/proc/@var{pid}/coredump_filter} when generating the core
-dump (@pxref{set use-coredump-filter}).
+dump (@pxref{set use-coredump-filter}), and by default honors the
+@code{VM_DONTDUMP} flag for mappings where it is present in the file
+@file{/proc/@var{pid}/smaps} (@pxref{set dump-excluded-mappings}).
 
 @kindex set use-coredump-filter
 @anchor{set use-coredump-filter}
@@ -10348,6 +10350,16 @@
 (anonymous private mappings), @code{1} (anonymous shared mappings),
 @code{4} (ELF headers) and @code{5} (private huge pages) are active.
 This will cause these memory mappings to be dumped automatically.
+
+@kindex set dump-excluded-mappings
+@anchor{set dump-excluded-mappings}
+@item set dump-excluded-mappings on
+@itemx set dump-excluded-mappings off
+If @code{on} is specified, @value{GDBN} will dump memory mappings
+marked with the @code{VM_DONTDUMP} flag.  This flag is represented in
+the file @file{/proc/@var{pid}/smaps} with the acronym @code{dd}.
+
+The default value is @code{off}.
 @end table
 
 @node Character Sets