On Fri, 22 Jan 2016 09:20:41 +0100 Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx> wrote: > > : in half since offsets can typically be expressed in 32 bits. > > : > """ > > In addition to fixing the broken grammar, would it make sense to > mention that dynamic relocation only occurs under > CONFIG_RELOCATABLE=y? I.e., something like > > """ > On 64-bit architectures, it cuts the size of the kallsyms address > table in half, since offsets between kernel symbols can typically be > expressed in 32 bits. This saves several hundreds of kilobytes of > permanent .rodata on average. In addition, the kallsyms address table > is no longer subject to dynamic relocation when CONFIG_RELOCATABLE is > in effect, so the relocation work done after decompression now doesn't > have to do relocation updates for all these values. This saves up to > 24 bytes (i.e., the size of a ELF64 RELA relocation table entry) per > table entry, which easily adds up to a couple of megabytes of > uncompressed __init data on ppc64 or arm64. Even if these relocation > entries typically compress well, the combined size reduction of 2.8 MB > uncompressed for a ppc64_defconfig build (of which 2.4 MB is __init > data) results in a ~500 KB space saving in the compressed image. > """ Yes, that sounds very good. I'd buy one :) Can you please send along a complete new changelog sometime? -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
