Messages in this thread | | | Subject | Re: [2.6 patch] schedule obsolete OSS drivers for removal | From | Nix <> | Date | Mon, 31 Oct 2005 15:59:02 +0000 |
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On 30 Oct 2005, Adrian Bunk said: > E.g. it's clear that unused code or unused EXPORT_SYMBOL's in the kernel > are bloat, so I am working on eliminating such bloat.
And thank you very much for that!
What's most notable to me is a substantial cross-arch reduction in .data space consumed. This non-FUSE-2.6.13 versus FUSE-2.6.14 UltraSPARC comparison shows this effect clearly:
-rwxr-xr-x 1 root root 3460304 Oct 13 00:55 vmlinux-2.6.13.4 -rwxr-xr-x 1 root root 3190448 Oct 29 17:18 vmlinux-2.6.14
2.6.13.4 2.6.14 section size size diff .text 2330144 2341280 +10236 .rodata 198361 199009 +648 .pci_fixup 1536 1536 0 __ksymtab 32352 32336 -16 __ksymtab_gpl 3536 4048 +512 __kcrctab 0 0 0 __kcrctab_gpl 0 0 0 __ksymtab_strings 44688 45424 +736 __param 1640 1640 0 .data 669288 387576 -281712 .data.cacheline_aligned 704 704 0 .data.read_mostly 428 13144 -12716 .fixup 18256 18268 +12 __ex_table 15760 15768 +8 .init.text 109728 94528 -15200 .init.data 7280 8712 +1432 .init.setup 792 816 +24 .initcall.init 784 808 +24 .con_initcall.init 16 16 0 .security_initcall.init 0 0 0 .init.ramfs 134 134 0 .bss 226528 226152 -376 .note.GNU-stack 0 0 0 __ex_table.1 216 216 0 __ex_table.2 16 496 +480 Total 3662187 3392611 -269576
On a similarly-configured Athlon the difference in .data is a little less pronounced, but still there.
UltraSPARC 2.6.13.4 versus 2.6.14 at boot:
Memory: 511576k available (2280k kernel code, 936k data, 128k init) [fffff80000000000,0000000037ebc000] Memory: 511848k available (2288k kernel code, 672k data, 112k init) [fffff80000000000,0000000037ebc000]
(that's 264K, the same as the .data size difference above)
Athlon 2.6.13.4 versus 2.6.14 at book:
Memory: 774828k/786432k available (2794k kernel code, 11156k reserved, 1022k data, 148k init, 0k highmem) Memory: 774996k/786432k available (2833k kernel code, 10988k reserved, 808k data, 152k init, 0k highmem)
(that's 214K different in .data although kernel code has grown a little here, probably thanks to FUSE).
Most OSes cannot claim to shrink across upgrades. Linux, at least the kernel, can. :)
-- `"Gun-wielding recluse gunned down by local police" isn't the epitaph I want. I am hoping for "Witnesses reported the sound up to two hundred kilometers away" or "Last body part finally located".' --- James Nicoll - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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