On Thu, Jun 01, 2023 at 03:40:01PM -0700, Lucas De Marchi wrote:
> With the recent changes to bypass loading the file it's possible to
> reduce the work in userspace and delegating it to the kernel. Without
> any compression to illustrate:
>
> Before:
> read(3, "\177ELF\2\1", 6) = 6
> lseek(3, 0, SEEK_SET) = 0
> newfstatat(3, "", {st_mode=S_IFREG|0644, st_size=238592, ...}, AT_EMPTY_PATH) = 0
> mmap(NULL, 238592, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7fd85cbd1000
> finit_module(3, "", 0) = 0
> munmap(0x7fd85cbd1000, 238592) = 0
> close(3) = 0
>
> After:
> read(3, "\177ELF\2\1", 6) = 6
> lseek(3, 0, SEEK_SET) = 0
> finit_module(3, "", 0) = 0
> close(3) = 0
It's not clear to me how the patches did the above, in particular
avoiding the newfstatat() for the non-decompression use case.
Luis
