On 12/18/23 at 11:40am, Pingfan Liu wrote: > From: Pingfan Liu <piliu@xxxxxxxxxx> > > The default size reserved for crashkernel=,low is decided by the macro > DEFAULT_CRASH_KERNEL_LOW_SIZE, which is based on arch. > > Signed-off-by: Pingfan Liu <piliu@xxxxxxxxxx> > Cc: Baoquan He <bhe@xxxxxxxxxx> > Cc: Dave Young <dyoung@xxxxxxxxxx> > To: kexec@xxxxxxxxxxxxxxxxxxx > To: linux-doc@xxxxxxxxxxxxxxx > --- > Documentation/admin-guide/kdump/kdump.rst | 5 +++-- > 1 file changed, 3 insertions(+), 2 deletions(-) > > diff --git a/Documentation/admin-guide/kdump/kdump.rst b/Documentation/admin-guide/kdump/kdump.rst > index 5762e7477a0c..a021ff155012 100644 > --- a/Documentation/admin-guide/kdump/kdump.rst > +++ b/Documentation/admin-guide/kdump/kdump.rst > @@ -310,8 +310,9 @@ crashkernel syntax > region above 4G, low memory under 4G is needed in this case. There are > three ways to get low memory: > > - 1) Kernel will allocate at least 256M memory below 4G automatically > - if crashkernel=Y,low is not specified. > + 1) Kernel will allocate a chunk of default size memory, which is based on > + architecture, below 4G automatically if crashkernel=Y,low is not > + specified. Good catch, thx. Acked-by: Baoquan He <bhe@xxxxxxxxxx> > 2) Let user specify low memory size instead. > 3) Specified value 0 will disable low memory allocation:: > > -- > 2.31.1 >
