On Wed, May 2, 2018 at 2:24 PM, Nicholas Piggin <npiggin@xxxxxxxxx> wrote: > On Wed, 2 May 2018 11:17:52 +0200 > Mathieu Malaterre <malat@xxxxxxxxxx> wrote: > >> Nick, >> >> On Sat, Apr 21, 2018 at 4:48 AM, Nicholas Piggin <npiggin@xxxxxxxxx> wrote: >> > On Fri, 20 Apr 2018 22:08:27 +0200 >> > Mathieu Malaterre <malat@xxxxxxxxxx> wrote: >> > >> >> On Fri, Apr 20, 2018 at 12:41 PM, Nicholas Piggin <npiggin@xxxxxxxxx> wrote: >> >> > On Fri, 20 Apr 2018 12:00:49 +0200 >> >> > Mathieu Malaterre <malat@xxxxxxxxxx> wrote: >> >> > >> >> >> On Fri, Apr 20, 2018 at 9:34 AM, Nicholas Piggin <npiggin@xxxxxxxxx> wrote: >> >> >> > This requires further changes to linker script to KEEP some tables >> >> >> > and wildcard compiler generated sections into the right place. This >> >> >> > includes pp32 modifications from Christophe Leroy. >> >> >> > >> >> >> > When compiling powernv_defconfig with this option: >> >> >> > >> >> >> > text data bss dec filename >> >> >> > 11827621 4810490 1341080 17979191 vmlinux >> >> >> > 11752437 4598858 1338776 17690071 vmlinux.dcde >> >> >> > >> >> >> > Resulting kernel is almost 400kB smaller (and still boots). >> >> >> > >> >> >> > [ppc32 numbers here] >> >> >> >> >> >> ^^^ >> >> >> >> >> >> Do you want somebody else to provide those numbers ? >> >> > >> >> > If you have a booting kernel, yes some more numbers would be good. >> >> >> >> I've used /boot/config-4.15.0-2-powerpc from my current debian >> >> package. Rebuild master with and without option, boot ok, load/unload >> >> module ok. >> >> >> >> $ size nick/vmlinux.with* >> >> text data bss dec hex filename >> >> 7386425 2364370 1425432 11176227 aa8923 nick/vmlinux.with >> >> 7461457 2475122 1428064 11364643 ad6923 nick/vmlinux.without >> >> >> >> This is not clear why with option the size of kernel is slightly bigger: >> >> >> >> $ du -sk nick/vmlinux.with* >> >> 124488 nick/vmlinux.with >> >> 124004 nick/vmlinux.without >> > >> > Not sure. readelf -S vmlinux may show something. >> > >> > To really get lots of detail, you can add to the top level Makefile: >> > >> > LDFLAGS_vmlinux += -M >> >> Here is what I did: >> >> $ git diff >> diff --git a/Makefile b/Makefile >> index 619a85ad716b..1a2e3d142a59 100644 >> --- a/Makefile >> +++ b/Makefile >> @@ -4,6 +4,7 @@ PATCHLEVEL = 17 >> SUBLEVEL = 0 >> EXTRAVERSION = -rc3 >> NAME = Fearless Coyote >> +LDFLAGS_vmlinux += -M > > That'll get overwritten further down. Put it down with another line > that starts with LDFLAGS_vmlinux += Sorry about that, I was not paying attention :( Anyway I cannot make sense of the output with -M. Here is a quick summary if needed (with option / without option). $ ./scripts/bloat-o-meter nick/vmlinux.without nick/vmlinux.with | head add/remove: 0/647 grow/shrink: 852/1846 up/down: 11276/-95033 (-83757) Function old new delta SiSInitPtr 2212 2600 +388 xmon_core.isra 7540 7900 +360 ata_attach_transport 840 1032 +192 via_pmu_interrupt 2828 3004 +176 matroxfb_init 3000 3156 +156 fbcon_scroll 3092 3248 +156 __do_adjtimex 1716 1868 +152 fbcon_event_notify 2044 2184 +140 $ ./scripts/bloat-o-meter nick/vmlinux.without nick/vmlinux.with | tail aty_set_pll18818 540 - -540 sel_ib_pkey_sid 556 - -556 pci_dev_acs_enabled 608 - -608 aa_label_find_merge 752 - -752 drmem_update_dt 796 - -796 powerpc_macros 1176 - -1176 ima_restore_measurement_list 1224 - -1224 rtas_os_term_buf 2048 - -2048 vle_opcodes 8200 - -8200 Total: Before=9927171, After=9843414, chg -0.84% > Thanks, > Nick -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
