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Subject[ANNOUNCE] 2.6.0-tiny1 tree for small systems
This is the second release of the -tiny kernel tree. The aim of this
tree is to collect patches that reduce kernel disk and memory
footprint as well as tools for working on small systems. Target users
are things like embedded systems, small or legacy desktop folks, and
handhelds.

Latest release includes:
- sync against 2.6.0
- fix for CONFIG_SYSCTL compilation
- Jeff Garzik's netdrvr patchkit, along with latest netpoll/netconsole code
- kgdb and kgdb-over-ethernet debugging support
- "make checkstack" to find largest stack users
- script to estimate actual code size of inline functions (experimental)
- some other minor new tweaks

Thanks to Holger Shuring, Bill Irwin, and Zwane Mwaikamba for sending
me various tweaks.

The patch, currently against 2.6.0, can be found at:

http://selenic.com/tiny/2.6.0-tiny1.patch.bz2
http://selenic.com/tiny/2.6.0-tiny1-broken-out.tar.bz2


And while I'm at it, I'll include some demo logs:

[my tiny test config: ide + vt + ext2 + net ]
$ size vmlinux
text data bss dec hex filename
861316 76979 20524 958819 ea163 vmlinux

LILO boot: tiny mem=4m
Loading tiny.........
Uncompressing Linux... Ok, booting the kernel.
# cat /proc/meminfo
MemTotal: 2772 kB
MemFree: 1096 kB
Buffers: 64 kB
Cached: 896 kB
SwapCached: 0 kB
Active: 788 kB
Inactive: 392 kB
HighTotal: 0 kB
HighFree: 0 kB
LowTotal: 2772 kB
LowFree: 1096 kB
SwapTotal: 0 kB
SwapFree: 0 kB
Dirty: 0 kB
Writeback: 0 kB
Mapped: 616 kB
Slab: 356 kB
Committed_AS: 280 kB
PageTables: 48 kB
VmallocTotal: 1032168 kB
VmallocUsed: 0 kB
VmallocChunk: 1032168 kB
#

[rebooting with kmalloc auditing and kallsyms]
# cat /proc/kmalloc
total bytes allocated: 266848
slack bytes allocated: 37774
net bytes allocated: 145568
number of allocs: 732
number of frees: 282
number of callers: 71
lost callers: 0
lost allocs: 0
unknown frees: 0

total slack net alloc/free caller
256 203 256 8/0 alloc_vfsmnt+0x73
8192 3648 4096 2/1 atkbd_connect+0x1b
192 48 64 3/2 seq_open+0x10
12288 0 4096 3/2 seq_read+0x53
8192 0 0 2/2 alloc_skb+0x3b
960 0 0 10/10 load_elf_interp+0xa1
1920 288 0 10/10 load_elf_binary+0x100
320 130 0 10/10 load_elf_binary+0x1d8
192 48 96 6/3 request_irq+0x22
7200 1254 7200 75/0 proc_create+0x74
64 43 64 2/0 proc_symlink+0x40
4096 984 0 1/1 check_partition+0x1b
69632 0 45056 17/6 dup_task_struct+0x38
128 48 128 2/0 netlink_create+0x84
128 20 128 1/0 ext2_fill_super+0x2f
32 28 32 1/0 ext2_fill_super+0x385
32 31 32 1/0 ext2_fill_super+0x3b6
608 76 384 19/7 __request_region+0x18
64 32 64 2/0 rand_initialize_disk+0xd
8192 2016 8192 2/0 alloc_tty_struct+0x10
128 56 128 2/0 init_dev+0xba
128 56 128 2/0 init_dev+0xf3
128 0 128 2/0 create_workqueue+0x28
8960 1680 8960 70/0 tty_add_class_device+0x20
2048 960 2048 4/0 alloc_tty_driver+0x10
9280 2332 9280 4/0 tty_register_driver+0x2d
288 0 288 9/0 mempool_create+0x16
1280 196 1280 9/0 mempool_create+0x41
1536 384 1536 8/0 mempool_create+0x8f
64 28 64 1/0 kbd_connect+0x3e
928 348 0 29/29 kmem_cache_create+0x235
28288 1448 28288 81/0 do_tune_cpucache+0x2c
...

[counting inline function calls]
$ make 2>../inline-info
CHK include/linux/version.h
SPLIT include/linux/autoconf.h -> include/config/*
make[1]: `arch/i386/kernel/asm-offsets.s' is up to date.
CHK include/asm-i386/asm_offsets.h
CC init/main.o
...
LD arch/i386/boot/compressed/vmlinux
OBJCOPY arch/i386/boot/vmlinux.bin
BUILD arch/i386/boot/bzImage
Root device is (3, 3)
Boot sector 512 bytes.
Setup is 2538 bytes.
System is 485 kB
Kernel: arch/i386/boot/bzImage is ready
$ scripts/count-inlines ../inline-info
2682 current_thread_info (485 in *.c)
calls:
callers: get_current(1764) <other>(276) copy_from_user(135)
copy_to_user(131) test_thread_flag(36) tcp_put_port(23)
tcp_set_state(22) verify_area(21) TLan_SetTimer(10)
tcp_enter_memory_pressure(6) set_thread_flag(6) sock_orphan(5)
inet_putpeer(5) dev_kfree_skb_any(5) clear_thread_flag(5)
inet_getid(3) sock_graft(2) igmp_mcf_get_first(2) icmp_xmit_lock(2)
csum_and_copy_to_user(2) test_and_clear_thread_flag(1)
tcp_v4_lookup(1) neigh_update_hhs(1) ip_finish_output2(1) gfp_any(1)
fn_flush_list(1) do_kdsk_ioctl(1) do_kdgkb_ioctl(1)
do_kbkeycode_ioctl(1) do_getname(1) alloc_buf(1) activate_task(1)
1764 get_current (1494 in *.c)
calls: current_thread_info(2682)
callers: <other>(417) capable(159) flush_tlb_page(11) flush_tlb_mm(10)
do_trap(10) on_sig_stack(9) sas_ss_flags(8) find_process_by_pid(6)
check_sticky(5) flush_tlb_range(4) walk_init_root(3) scm_send(3)
current_is_pdflush(3) current_is_kswapd(3) rwsem_down_failed_common(2)
kmem_freepages(2) get_sigframe(2) follow_dotdot(2) do_mmap2(2)
do_follow_link(2) __vfs_follow_link(2) __exit_mm(2) scm_check_creds(1)
save_i387_fsave(1) restore_i387_fsave(1) read_zero_pagealigned(1)
handle_group_stop(1) good_sigevent(1) get_close_on_exec(1)
fork_traceflag(1) ext2_init_acl(1) exec_permission_lite(1) dup_mmap(1)
do_tty_write(1) de_thread(1) copy_signal(1) copy_sighand(1) copy_fs(1)
cap_set_all(1) cap_netlink_send(1) cap_emulate_setxuid(1)
arch_get_unmapped_area(1)

...

[top stack users]
$ make checkstack
objdump -d vmlinux | perl scripts/checkstack.pl i386
1492 ide_unregister
1428 huft_build
1320 inflate_dynamic
1168 inflate_fixed
552 ip_setsockopt
460 tcp_v4_conn_request
456 tcp_check_req
448 tcp_timewait_state_process
440 ip_getsockopt
368 extract_entropy
320 do_execve
288 icmp_send
...
--
Matt Mackall : http://www.selenic.com : Linux development and consulting
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