Messages in this thread | | | From | Christophe Leroy <> | Subject | Re: [PATCH v1 0/4] Kill the time spent in patch_instruction() | Date | Tue, 27 Sep 2022 14:38:25 +0000 |
| |
Argh !! Looks like I sent an old already applied series nested in the new one.
Ignore those x/4 patches, only look at the x/6 ones.
Le 27/09/2022 à 16:33, Christophe Leroy a écrit : > This series reduces by 70% the time required to activate > ftrace on an 8xx with CONFIG_STRICT_KERNEL_RWX. > > Measure is performed in function ftrace_replace_code() using mftb() > around the loop. > > With the series, > - Without CONFIG_STRICT_KERNEL_RWX, 416000 TB ticks are measured. > - With CONFIG_STRICT_KERNEL_RWX, 546000 TB ticks are measured. > > Before this series, > - Without CONFIG_STRICT_KERNEL_RWX, 427000 TB ticks are measured. > - With CONFIG_STRICT_KERNEL_RWX, 1744000 TB ticks are measured. > > Before the series, CONFIG_STRICT_KERNEL_RWX multiplies the time > required for ftrace activation by more than 4. > > With the series, CONFIG_STRICT_KERNEL_RWX increases the time > required for ftrace activation by only 30% > > Christophe Leroy (4): > powerpc/code-patching: Don't call is_vmalloc_or_module_addr() without > CONFIG_MODULES > powerpc/code-patching: Speed up page mapping/unmapping > powerpc/code-patching: Use jump_label for testing freed initmem > powerpc/code-patching: Use jump_label to check if poking_init() is > done > > arch/powerpc/include/asm/code-patching.h | 2 ++ > arch/powerpc/lib/code-patching.c | 37 +++++++++++++++--------- > arch/powerpc/mm/mem.c | 2 ++ > 3 files changed, 28 insertions(+), 13 deletions(-) > | |