diff options
| author | markj <markj@FreeBSD.org> | 2015-03-09 03:50:53 +0000 |
|---|---|---|
| committer | markj <markj@FreeBSD.org> | 2015-03-09 03:50:53 +0000 |
| commit | 25e41e0131227176ba3e292de17004267793257b (patch) | |
| tree | c2951caec9b898eb9457779108d4f0b71d4607bb /sys/conf/NOTES | |
| parent | ef19e8f5a5201503d97ab0010589e37aadf9e262 (diff) | |
| download | FreeBSD-src-25e41e0131227176ba3e292de17004267793257b.zip FreeBSD-src-25e41e0131227176ba3e292de17004267793257b.tar.gz | |
Reimplement support for userland core dump compression using a new interface
in kern_gzio.c. The old gzio interface was somewhat inflexible and has not
worked properly since r272535: currently, the gzio functions are called with
a range lock held on the output vnode, but kern_gzio.c does not pass the
IO_RANGELOCKED flag to vn_rdwr() calls, resulting in deadlock when vn_rdwr()
attempts to reacquire the range lock. Moreover, the new gzio interface can
be used to implement kernel core compression.
This change also modifies the kernel configuration options needed to enable
userland core dump compression support: gzio is now an option rather than a
device, and the COMPRESS_USER_CORES option is removed. Core dump compression
is enabled using the kern.compress_user_cores sysctl/tunable.
Differential Revision: https://reviews.freebsd.org/D1832
Reviewed by: rpaulo
Discussed with: kib
Diffstat (limited to 'sys/conf/NOTES')
| -rw-r--r-- | sys/conf/NOTES | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/sys/conf/NOTES b/sys/conf/NOTES index 8b6a4c8..c0d5879 100644 --- a/sys/conf/NOTES +++ b/sys/conf/NOTES @@ -2889,11 +2889,6 @@ options SHMMNI=33 # a single process at one time. options SHMSEG=9 -# Compress user core dumps. -options COMPRESS_USER_CORES -# required to compress file output from kernel for COMPRESS_USER_CORES. -device gzio - # Set the amount of time (in seconds) the system will wait before # rebooting automatically when a kernel panic occurs. If set to (-1), # the system will wait indefinitely until a key is pressed on the @@ -2983,3 +2978,7 @@ options RANDOM_DEBUG # Debugging messages # Module to enable execution of application via emulators like QEMU options IMAGACT_BINMISC + +# zlib I/O stream support +# This enables support for compressed core dumps. +options GZIO |
