14 messages in org.freebsd.freebsd-archU Area Removal| From | Sent On | Attachments |
|---|---|---|
| David Schultz | Nov 10, 2004 7:00 pm | |
| Scott Long | Nov 10, 2004 7:15 pm | |
| Brian Fundakowski Feldman | Nov 10, 2004 7:16 pm | |
| Bruce M Simpson | Nov 10, 2004 7:32 pm | |
| Scott Long | Nov 10, 2004 7:44 pm | |
| David Schultz | Nov 10, 2004 7:56 pm | |
| Julian Elischer | Nov 10, 2004 9:59 pm | |
| Marcel Moolenaar | Nov 10, 2004 11:53 pm | |
| John Baldwin | Nov 11, 2004 9:28 am | |
| Scott Long | Nov 11, 2004 4:16 pm | |
| David Schultz | Nov 11, 2004 5:01 pm | |
| Marcel Moolenaar | Nov 11, 2004 7:51 pm | |
| Scott Long | Nov 11, 2004 10:26 pm | |
| Matthew Dillon | Nov 13, 2004 6:19 pm |
| Subject: | U Area Removal | |
|---|---|---|
| From: | David Schultz (da...@FreeBSD.ORG) | |
| Date: | Nov 11, 2004 5:01:38 pm | |
| List: | org.freebsd.freebsd-arch | |
On Thu, Nov 11, 2004, Scott Long wrote:
I propose to remove the ability to swap the U area, allocating p_stats from malloced memory instead. Medium-term scheduling and swapping of kernel stacks would be retained. Here are the patches; !i386 testers wanted:
http://www.freebsd.org/~das/patches/upages.diff
[1] Most of the instances of PHOLD() and PRELE() right now never needed to be there or have been unnecessary ever since the PCB was moved out of the U area.
This breaks amd64 in bad ways on boot. I'll send a trace and more info when I get a serial console hooked up.
The bug jhb mentioned may be responsible for this:
| +struct pstats * | +pstats_alloc(void) | +{ | + | + return (malloc(sizeof(struct plimit), M_SUBPROC, M_ZERO|M_WAITOK)); | +} | | I think you mean s/plimit/pstats/ there.
On 32-bit architectures, sizeof(struct plimit) is 184 bytes and sizeof(struct pstats) is 216 bytes, so requests for either would get a 256-byte allocation and things work fine. But on 64-bit architectures, sizeof(struct plimit) is 192 bytes and sizeof(struct pstats) is 432 bytes...
In any case, I've updated the patch to correct this cut-and-paste-o.