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| author | dillon <dillon@FreeBSD.org> | 2001-03-14 06:48:53 +0000 |
|---|---|---|
| committer | dillon <dillon@FreeBSD.org> | 2001-03-14 06:48:53 +0000 |
| commit | be9d069cf0df15e40cb07b595afbe56b5359b408 (patch) | |
| tree | 5400fcb9ba1e85e52bb34d8439cc6b6f68e28828 /sys/vm/vm_map.h | |
| parent | 3b687e65750ed4e689dbfe35d1267ffffc702907 (diff) | |
| download | FreeBSD-src-be9d069cf0df15e40cb07b595afbe56b5359b408.zip FreeBSD-src-be9d069cf0df15e40cb07b595afbe56b5359b408.tar.gz | |
Fix a lock reversal problem in the VM subsystem related to threaded
programs. There is a case during a fork() which can cause a deadlock.
From Tor -
The workaround that consists of setting a flag in the vm map that
indicates that a fork is in progress and using that mark in the page
fault handling to force a revalidation failure. That change will only
affect (pessimize) page fault handling during fork for threaded
(linuxthreads style) applications and applications using aio_*().
Submited by: tegge
Diffstat (limited to 'sys/vm/vm_map.h')
| -rw-r--r-- | sys/vm/vm_map.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sys/vm/vm_map.h b/sys/vm/vm_map.h index 291826b..d52d2d8 100644 --- a/sys/vm/vm_map.h +++ b/sys/vm/vm_map.h @@ -162,6 +162,7 @@ struct vm_map { int nentries; /* Number of entries */ vm_size_t size; /* virtual size */ u_char system_map; /* Am I a system map? */ + u_char infork; /* Am I in fork processing? */ vm_map_entry_t hint; /* hint for quick lookups */ unsigned int timestamp; /* Version number */ vm_map_entry_t first_free; /* First free space hint */ |
