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Diffstat (limited to 'Documentation/admin-guide/kernel-parameters.txt')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 35b592823338..388653448e72 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -6752,6 +6752,19 @@ memory at 0x284500000 that is 12Megs. The per CPU buffers of that instance will be split up accordingly. + Alternatively, the memory can be reserved by the reserve_mem option: + + reserve_mem=12M:4096:trace trace_instance=boot_map@trace + + This will reserve 12 megabytes at boot up with a 4096 byte alignment + and place the ring buffer in this memory. Note that due to KASLR, the + memory may not be the same location each time, which will not preserve + the buffer content. + + Also note that the layout of the ring buffer data may change between + kernel versions where the validator will fail and reset the ring buffer + if the layout is not the same as the previous kernel. + trace_options=[option-list] [FTRACE] Enable or disable tracer options at boot. The option-list is a comma delimited list of options |