From: Godmar Back Date: Mon, 8 Jan 2007 09:55:17 +0000 (+0000) Subject: clarified stack limit issue and removed comment about first instruction faulting... X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=74054a2132f28e7b33e13c8c6baddbb92ca017f1;p=pintos-anon clarified stack limit issue and removed comment about first instruction faulting in stack page --- diff --git a/doc/vm.texi b/doc/vm.texi index 3210bbc..25135f0 100644 --- a/doc/vm.texi +++ b/doc/vm.texi @@ -590,16 +590,14 @@ user stack pointer. You will need to arrange another way, such as saving @code{esp} into @struct{thread} on the initial transition from user to kernel mode. -You may impose some absolute limit on stack size, as do most OSes. +You should 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. 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 -for it to be faulted in. (Even if you did wait, the very first -instruction in the user program is likely to be one that faults in the -page.) +The first stack page need not be allocated lazily. You can allocate +and initialize it with the command line arguments at load time, with +no need to wait for it to be faulted in. All stack pages should be candidates for eviction. An evicted stack page should be written to swap.