On 2025-01-23 17:12:54 Thu, Sourabh Jain wrote: > Update the fadump document to include details about the fadump > additional parameter feature. > > The document includes the following: > - Significance of the feature > - How to use it > - Feature restrictions > > No functional changes are introduced. > > Cc: Avnish Chouhan <avn...@linux.ibm.com> > Cc: Brian King <brk...@linux.ibm.com> > Cc: Hari Bathini <hbath...@linux.ibm.com> > Cc: Madhavan Srinivasan <ma...@linux.ibm.com> > Cc: Michael Ellerman <m...@ellerman.id.au> > Cc: Mahesh Salgaonkar <mah...@linux.ibm.com> > Signed-off-by: Sourabh Jain <sourabhj...@linux.ibm.com> > --- > Documentation/ABI/testing/sysfs-kernel-fadump | 3 ++- > .../arch/powerpc/firmware-assisted-dump.rst | 22 +++++++++++++++++++ > 2 files changed, 24 insertions(+), 1 deletion(-) > > diff --git a/Documentation/ABI/testing/sysfs-kernel-fadump > b/Documentation/ABI/testing/sysfs-kernel-fadump > index 2f9daa7ca55b..b64b7622e6fc 100644 > --- a/Documentation/ABI/testing/sysfs-kernel-fadump > +++ b/Documentation/ABI/testing/sysfs-kernel-fadump [...] > +-- Support for Additional Kernel Arguments in Fadump > + Fadump has a feature that allows passing additional kernel arguments > + to the fadump kernel. This feature was primarily designed to disable > + kernel functionalities that are not required for the fadump kernel > + and to reduce its memory footprint while collecting the dump. > + > + Command to Add Additional Kernel Parameters to Fadump: > + e.g. > + # echo "nr_cpus=16" > /sys/kernel/fadump/bootargs_append > + > + The above command is sufficient to add additional arguments to fadump. > + An explicit service restart is not required. > + > + Command to Retrieve the Additional Fadump Arguments: > + e.g. > + # cat /sys/kernel/fadump/bootargs_append > + > +Note: Additional kernel arguments for fadump with HASH MMU is only > + supported if the RMA size is greater than 768 MB. If the RMA > + size is less than 768 MB, the kernel does not export the > + /sys/kernel/fadump/bootargs_append sysfs node.
Reviewed-by: Mahesh Salgaonkar <mah...@linux.ibm.com> Thanks, -Mahesh. > + > Implementation details: > ----------------------- > > -- > 2.48.1 > > -- Mahesh J Salgaonkar
