Be more clear about the downsides, the upsides (yes, there are some!) and about code that unconditionally sets that. Reviewed-by: Stephen Brennan <stephen.s.brennan@xxxxxxxxxx> Signed-off-by: Guilherme G. Piccoli <gpiccoli@xxxxxxxxxx> --- V2: Some wording improvements from Stephen, thanks! Also added his review tag. V1 link: https://lore.kernel.org/r/20240830140401.458542-1-gpiccoli@xxxxxxxxxx/ Documentation/admin-guide/kernel-parameters.txt | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index efc52ddc6864..351730108c58 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -913,12 +913,16 @@ the parameter has no effect. crash_kexec_post_notifiers - Run kdump after running panic-notifiers and dumping - kmsg. This only for the users who doubt kdump always - succeeds in any situation. - Note that this also increases risks of kdump failure, - because some panic notifiers can make the crashed - kernel more unstable. + Only jump to kdump kernel after running the panic + notifiers and dumping kmsg. This option increases the + risks of a kdump failure, since some panic notifiers + can make the crashed kernel more unstable. In the + configurations where kdump may not be reliable, + running the panic notifiers can allow collecting more + data on dmesg, like stack traces from other CPUS or + extra data dumped by panic_print. Notice that some + code enables this option unconditionally, like + Hyper-V, PowerPC (fadump) and AMD SEV. crashkernel=size[KMG][@offset[KMG]] [KNL,EARLY] Using kexec, Linux can switch to a 'crash kernel' -- 2.46.0
