Clarify stack limit.

[pintos-anon] / doc / vm.texi

diff --git a/doc/vm.texi b/doc/vm.texi
index 544701a5b90844f24588e3d5d7dadc81d0244ec9..982cdcb4f3d06bdd619e22c196c9cc0e8ea713da 100644 (file)
--- a/doc/vm.texi
+++ b/doc/vm.texi
@@ -501,8 +501,9 @@ not be restartable in a straightforward fashion.)  Similarly, the
 bytes below the stack pointer.
 
 You may impose some absolute limit on stack size, as do most OSes.
-(Some OSes make the limit user-adjustable, e.g.@: with the
-@command{ulimit} command on many Unix systems.)
+Some OSes make the limit user-adjustable, e.g.@: with the
+@command{ulimit} command on many Unix systems.  On many GNU/Linux systems,
+the default limit is 8 MB.
 
 The first stack page need not be allocated lazily.  You can initialize
 it with the command line arguments at load time, with no need to wait
@@ -580,9 +581,15 @@ Here's a summary of our reference solution, produced by the
 @command{diffstat} program.  The final row gives total lines inserted
 and deleted; a changed line counts as both an insertion and a deletion.
 
-This summary is relative to the Pintos base code, but we started from
-the reference solution to project 2.  @xref{Project 2 FAQ}, for the
-summary of project 2.
+This summary is relative to the Pintos base code, but the reference
+solution for project 3 starts from the reference solution to project 2.
+@xref{Project 2 FAQ}, for the summary of project 2.
+
+The reference solution represents just one possible solution.  Many
+other solutions are also possible and many of those differ greatly from
+the reference solution.  Some excellent solutions may not modify all the
+files modified by the reference solution, and some may modify files not
+modified by the reference solution.
 
 @verbatim
  Makefile.build       |    4