On 11/26/2014 12:08 PM, Dave Young wrote:
Hi, Hari
On 11/25/14 at 11:42am, Hari Bathini wrote:
When the value of vm.min_free_kbytes is set too high in /etc/sysctl.conf, kdump kernel fails with OOM. As min_free_kbytes may not be relevant for kdump kernel, this patch tries to fix the issue by removing it from the file sysctl.conf and thus forcing default value for vm.min_free_kbytes parameter.
Signed-off-by: Hari Bathini hbathini@linux.vnet.ibm.com
dracut-module-setup.sh | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/dracut-module-setup.sh b/dracut-module-setup.sh index dcebc47..6ada7d3 100755 --- a/dracut-module-setup.sh +++ b/dracut-module-setup.sh @@ -612,6 +612,11 @@ install() { # Also redirect dracut-emergency to kdump error handler ln_r "$systemdsystemunitdir/emergency.service" "$systemdsystemunitdir/dracut-emergency.service"
- # While min_free_kbytes may not be relevant for kdump kernel,
- # it leads to OOM in cases where this value is too high.
- # Let's be paranoid and force it to default value calculated in kernel.
- sed -e "/^$/d" -e "/^#/d" -e "/min_free_kbytes/d" /etc/sysctl.conf > "${initdir}/etc/sysctl.conf"
sysctl vm values are most for normal boot instead of initramfs, so I think default value should be good. But is there any other way to specify the value ie. cmdline param instead of hardcode here?
Dave, that was the first thing I tried. But couldn't find a boot parameter that overrides runtime parameters in sysctl.conf. As sysctl does runtime configuration for kernel parameters, I doubt if there is a boot time parameter to override these options. But if we do have, that would be nice for this kind of scenarios...
Thanks Hari
# Check for all the devices and if any device is iscsi, bring up iscsi # target. Ideally all this should be pushed into dracut iscsi module # at some point of time.
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