LinuxカーネルHack: git blameとその応用
svn blameは日常良く使うけど、gitでも同じことができるか調べたら、やっぱりできた。git blameで。git blameは、横幅かなり取るなぁ。
% git blame mm/oom_kill.c ^1da177e (Linus Torvalds 2005-04-16 15:20:36 -0700 1) /* ^1da177e (Linus Torvalds 2005-04-16 15:20:36 -0700 2) * linux/mm/oom_kill.c ^1da177e (Linus Torvalds 2005-04-16 15:20:36 -0700 3) * ^1da177e (Linus Torvalds 2005-04-16 15:20:36 -0700 4) * Copyright (C) 1998,2000 Rik van Riel ^1da177e (Linus Torvalds 2005-04-16 15:20:36 -0700 5) * Thanks go out to Claus Fischer for some serious inspiration and ^1da177e (Linus Torvalds 2005-04-16 15:20:36 -0700 6) * for goading me into coding this file... a63d83f4 (David Rientjes 2010-08-09 17:19:46 -0700 7) * Copyright (C) 2010 Google, Inc. a63d83f4 (David Rientjes 2010-08-09 17:19:46 -0700 8) * Rewritten by David Rientjes ^1da177e (Linus Torvalds 2005-04-16 15:20:36 -0700 9) * ^1da177e (Linus Torvalds 2005-04-16 15:20:36 -0700 10) * The routines in this file are used to kill a process when a49335cc (Paul Jackson 2005-09-06 15:18:09 -0700 11) * we're seriously out of memory. This gets called from __alloc_pages() a49335cc (Paul Jackson 2005-09-06 15:18:09 -0700 12) * in mm/page_alloc.c when we really run out of memory. ^1da177e (Linus Torvalds 2005-04-16 15:20:36 -0700 13) * ^1da177e (Linus Torvalds 2005-04-16 15:20:36 -0700 14) * Since we won't call these routines often (on a well-configured ^1da177e (Linus Torvalds 2005-04-16 15:20:36 -0700 15) * machine) this file will double as a 'coding guide' and a signpost ^1da177e (Linus Torvalds 2005-04-16 15:20:36 -0700 16) * for newbie kernel hackers. It features several pointers to major ^1da177e (Linus Torvalds 2005-04-16 15:20:36 -0700 17) * kernel subsystems and hints as to where to find out what things do. ^1da177e (Linus Torvalds 2005-04-16 15:20:36 -0700 18) */ ^1da177e (Linus Torvalds 2005-04-16 15:20:36 -0700 19) 8ac773b4 (Alexey Dobriyan 2006-10-19 23:28:32 -0700 20) #include <linux/oom.h> ^1da177e (Linus Torvalds 2005-04-16 15:20:36 -0700 21) #include <linux/mm.h> 4e950f6f (Alexey Dobriyan 2007-07-30 02:36:13 +0400 22) #include <linux/err.h> 5a0e3ad6 (Tejun Heo 2010-03-24 17:04:11 +0900 23) #include <linux/gfp.h> ^1da177e (Linus Torvalds 2005-04-16 15:20:36 -0700 24) #include <linux/sched.h> ^1da177e (Linus Torvalds 2005-04-16 15:20:36 -0700 25) #include <linux/swap.h> ^1da177e (Linus Torvalds 2005-04-16 15:20:36 -0700 26) #include <linux/timex.h> ^1da177e (Linus Torvalds 2005-04-16 15:20:36 -0700 27) #include <linux/jiffies.h> ef08e3b4 (Paul Jackson 2005-09-06 15:18:13 -0700 28) #include <linux/cpuset.h> 8bc719d3 (Martin Schwidefsky 2006-09-25 23:31:20 -0700 29) #include <linux/module.h> 8bc719d3 (Martin Schwidefsky 2006-09-25 23:31:20 -0700 30) #include <linux/notifier.h> c7ba5c9e (Pavel Emelianov 2008-02-07 00:13:58 -0800 31) #include <linux/memcontrol.h> 6f48d0eb (David Rientjes 2010-08-09 17:18:52 -0700 32) #include <linux/mempolicy.h> 5cd9c58f (David Howells 2008-08-14 11:37:28 +0100 33) #include <linux/security.h> [...]
応用として、mm/oom_kill.cに誰が書いたコードがどれくらい(行数)生きているのか、ワンライナーを書いて調べてみた。KOSAKIさんのコードが結構入ってる。同じく日本人のKAMEZAWA Hiroyukiさんのコードも。
% git blame mm/oom_kill.c | perl -ne 'print "$1\n" if /^.+? \((.+?) \d{4}/' | sort | uniq -c | sort -nr
373 David Rientjes
88 Linus Torvalds
58 KOSAKI Motohiro
31 Nick Piggin
31 Luis Claudio R. Goncalves
26 KAMEZAWA Hiroyuki
24 Oleg Nesterov
22 Martin Schwidefsky
21 Mel Gorman
15 Christoph Lameter
14 Pavel Emelianov
9 Paul Jackson
5 Randy Dunlap
3 Dave Peterson
2 Minchan Kim
2 Li Zefan
2 Kurt Garloff
2 Daisuke Nishimura
2 Andrew Morton
2 Alexey Dobriyan
1 Tejun Heo
1 Kirill Korotaev
1 David Howells
1 Balbir Singh
