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    SubjectRe: [PATCH] concurrent inode allocation for ext2 against 2.5.64
    On Sat, Mar 15, 2003 at 02:02:41PM -0800, William Lee Irwin III wrote:
    > c01dc9ac 4532033 21.4566 .text.lock.dec_and_lock
    > c0169c0b 3835802 18.1603 .text.lock.dcache
    > c0106ff4 1741849 8.24666 default_idle

    More detailed wrt. atomic_dec_and_lock():

    c01dc920 1344198 6.36401 atomic_dec_and_lock
    c01dc920 567 0.0421813
    c01dc921 503 0.0374201
    c01dc923 8 0.00059515
    c01dc924 204 0.0151763
    c01dc925 199 0.0148044
    c01dc928 211 0.0156971
    c01dc92b 335 0.0249219
    c01dc92d 27983 2.08176
    c01dc930 118 0.00877847
    c01dc932 206 0.0153251
    c01dc934 181 0.0134653
    c01dc936 98 0.00729059
    c01dc93a 317972 23.6551
    c01dc93c 5 0.000371969
    c01dc93e 216 0.0160691
    c01dc942 43 0.00319893
    c01dc949 176692 13.1448
    c01dc962 749 0.055721
    c01dc965 809754 60.2407
    c01dc967 4 0.000297575
    c01dc96a 6005 0.446735
    c01dc971 56 0.00416605
    c01dc97f 2 0.000148788
    c01dc9a1 228 0.0169618
    c01dc9a3 217 0.0161435
    c01dc9a6 9 0.000669544
    c01dc9a7 1328 0.098795
    c01dc9a8 141 0.0104895
    c01dc9ab 164 0.0122006

    c01dc920 <atomic_dec_and_lock>:
    c01dc920: 55 push %ebp
    c01dc921: 89 e5 mov %esp,%ebp
    c01dc923: 56 push %esi
    c01dc924: 53 push %ebx
    c01dc925: 8b 75 08 mov 0x8(%ebp),%esi
    c01dc928: 8b 5d 0c mov 0xc(%ebp),%ebx
    c01dc92b: 8b 16 mov (%esi),%edx
    c01dc92d: 8d 4a ff lea 0xffffffff(%edx),%ecx
    c01dc930: 85 c9 test %ecx,%ecx
    c01dc932: 74 0e je c01dc942 <atomic_dec_and_lock+0x2
    2>
    c01dc934: 89 d0 mov %edx,%eax
    c01dc936: f0 0f b1 0e lock cmpxchg %ecx,(%esi)
    c01dc93a: 89 c1 mov %eax,%ecx
    c01dc93c: 39 d1 cmp %edx,%ecx
    c01dc93e: 75 eb jne c01dc92b <atomic_dec_and_lock+0xb
    >
    c01dc940: eb 5f jmp c01dc9a1 <atomic_dec_and_lock+0x8
    1>
    c01dc942: 81 7b 04 ad 4e ad de cmpl $0xdead4ead,0x4(%ebx)
    c01dc949: 74 17 je c01dc962 <atomic_dec_and_lock+0x4
    2>
    c01dc94b: 68 42 c9 1d c0 push $0xc01dc942
    c01dc950: 68 4c d1 2e c0 push $0xc02ed14c
    c01dc955: e8 4e 28 f4 ff call c011f1a8 <printk>
    c01dc95a: 0f 0b ud2a
    c01dc95c: 7b 00 jnp c01dc95e <atomic_dec_and_lock+0x3
    e>
    c01dc95e: 35 d1 2e c0 f0 xor $0xf0c02ed1,%eax
    c01dc963: fe 0b decb (%ebx)
    c01dc965: 78 45 js c01dc9ac <.text.lock.dec_and_lock
    >
    c01dc967: f0 ff 0e lock decl (%esi)
    c01dc96a: 0f 94 c0 sete %al
    c01dc96d: 84 c0 test %al,%al
    c01dc96f: 74 07 je c01dc978 <atomic_dec_and_lock+0x5
    8>
    c01dc971: b8 01 00 00 00 mov $0x1,%eax
    c01dc976: eb 2b jmp c01dc9a3 <atomic_dec_and_lock+0x8
    3>
    c01dc978: 81 7b 04 ad 4e ad de cmpl $0xdead4ead,0x4(%ebx)
    c01dc97f: 74 0f je c01dc990 <atomic_dec_and_lock+0x7
    0>
    c01dc981: 0f 0b ud2a
    c01dc983: 4a dec %edx
    c01dc984: 00 35 d1 2e c0 8d add %dh,0x8dc02ed1
    c01dc98a: b4 26 mov $0x26,%ah
    c01dc98c: 00 00 add %al,(%eax)
    c01dc98e: 00 00 add %al,(%eax)
    c01dc990: 8a 03 mov (%ebx),%al
    c01dc992: 84 c0 test %al,%al
    c01dc994: 7e 08 jle c01dc99e <atomic_dec_and_lock+0x7
    e>
    c01dc996: 0f 0b ud2a
    c01dc998: 4c dec %esp
    c01dc999: 00 35 d1 2e c0 c6 add %dh,0xc6c02ed1
    c01dc99f: 03 01 add (%ecx),%eax
    c01dc9a1: 31 c0 xor %eax,%eax
    c01dc9a3: 8d 65 f8 lea 0xfffffff8(%ebp),%esp
    c01dc9a6: 5b pop %ebx
    c01dc9a7: 5e pop %esi
    c01dc9a8: 89 ec mov %ebp,%esp
    c01dc9aa: 5d pop %ebp
    c01dc9ab: c3 ret

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