[PATCH] Documentation: Improve crash_kexec_post_notifiers description
"Guilherme G. Piccoli" <[email protected]>
| Newsgroups | org.kernel.vger.linux-debuggers,org.infradead.lists.kexec,org.kernel.vger.linux-doc,org.kernel.vger.linux-kernel |
|---|---|
| Message-ID | <[email protected]> |
Be more clear about the downsides, the upsides (yes, there are some!) and about code that unconditionally sets that. Signed-off-by: Guilherme G. Piccoli <[email protected]> --- 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..cb25dc5cbe9a 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. As a bright + side, it might allow to collect more data on dmesg like + stack traces from other CPUs or extra data dumped by + panic_print. This is usually only for users who doubt + kdump will succeed every time. 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