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Date: Mon, 22 Mar 2010 09:28:32 +0100
From: Ingo Molnar <mingo@...e.hu>
To: Jiri Kosina <jkosina@...e.cz>
Cc: linux-kernel@...r.kernel.org, x86@...nel.org,
Yinghai Lu <yinghai@...nel.org>,
"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] x86: remove early_res debug output (was Re: Confusing
bootmem messages on bootup)
* Jiri Kosina <jkosina@...e.cz> wrote:
>
> [ some more CCs added ]
>
> On Fri, 19 Mar 2010, Jiri Kosina wrote:
>
> > Hi,
> >
> > current tree (HEAD on 39710479303fd3a) gives quite non-informative and
> > confusing output during bootup:
> >
> >
> > === cut here ===
> > Subtract (85 early reservations)
> > #1 [0001000000 - 00023dc5e8] TEXT DATA BSS
> > #2 [003753c000 - 0037fefdaa] RAMDISK
> > #3 [00023dd000 - 00023dd214] BRK
> > #4 [00000f8390 - 0000100000] BIOS reserved
> > #5 [00000f8380 - 00000f8390] MP-table mpf
> > #6 [000009dc00 - 000009e271] BIOS reserved
> > #7 [000009e54d - 00000f8380] BIOS reserved
> > #8 [000009e271 - 000009e54d] MP-table mpc
> > #9 [0000010000 - 0000012000] TRAMPOLINE
> > #10 [0000012000 - 0000016000] ACPI WAKEUP
> > #11 [0000016000 - 0000018000] PGTABLE
> > #12 [0000018000 - 0000019000] PGTABLE
> > #13 [0000019000 - 000001d640] MEMNODEMAP
> > #14 [00023dd240 - 00023e2240] NODE_DATA
> > #15 [0100000000 - 0100005000] NODE_DATA
> > #16 [0130000000 - 0130005000] NODE_DATA
> > #17 [01b0000000 - 01b0005000] NODE_DATA
> > #18 [00023e2240 - 00023e3240] BOOTMEM
> > #19 [00023dc600 - 00023dc780] BOOTMEM
> > #20 [0080000000 - 0080000180] BOOTMEM
> > #21 [0130005000 - 0130005180] BOOTMEM
> > #22 [01b0005000 - 01b0005180] BOOTMEM
> > #23 [0002be4000 - 0002be5000] BOOTMEM
> > #24 [0002be5000 - 0002be6000] BOOTMEM
> > #25 [0002c00000 - 0004800000] MEMMAP 0
> > #26 [0100200000 - 0102000000] MEMMAP 1
> > #27 [0130200000 - 0131e00000] MEMMAP 2
> > #28 [01b0200000 - 01b1e00000] MEMMAP 3
> > #29 [00023dc780 - 00023dcb80] BOOTMEM
> > #30 [00023e3240 - 0002403240] BOOTMEM
> > #31 [0080000180 - 0080020180] BOOTMEM
> > #32 [0080020180 - 0080030180] BOOTMEM
> > #33 [0130005180 - 0130025180] BOOTMEM
> > #34 [01b0005180 - 01b0025180] BOOTMEM
> > #35 [0002404000 - 0002405000] BOOTMEM
> > #36 [00023dcb80 - 00023dcbc1] BOOTMEM
> > #37 [00023dcc00 - 00023dccc9] BOOTMEM
> > #38 [00023dcd00 - 00023dcfd8] BOOTMEM
> > #39 [0002403240 - 00024032a8] BOOTMEM
> > #40 [00024032c0 - 0002403328] BOOTMEM
> > #41 [0002403340 - 00024033a8] BOOTMEM
> > #42 [00024033c0 - 0002403428] BOOTMEM
> > #43 [0002403440 - 00024034a8] BOOTMEM
> > #44 [00024034c0 - 0002403528] BOOTMEM
> > #45 [0002403540 - 00024035a8] BOOTMEM
> > #46 [00024035c0 - 0002403628] BOOTMEM
> > #47 [0002403640 - 00024036a8] BOOTMEM
> > #48 [00024036c0 - 0002403728] BOOTMEM
> > #49 [0002403740 - 00024037a8] BOOTMEM
> > #50 [00024037c0 - 0002403828] BOOTMEM
> > #51 [0002403840 - 0002403860] BOOTMEM
> > #52 [0002403880 - 00024038a0] BOOTMEM
> > #53 [00024038c0 - 0002403958] BOOTMEM
> > #54 [0002403980 - 0002403a18] BOOTMEM
> > #55 [0002600000 - 000261c000] BOOTMEM
> > #56 [0002680000 - 000269c000] BOOTMEM
> > #57 [0002700000 - 000271c000] BOOTMEM
> > #58 [0002780000 - 000279c000] BOOTMEM
> > #59 [0080200000 - 008021c000] BOOTMEM
> > #60 [0080280000 - 008029c000] BOOTMEM
> > #61 [0080300000 - 008031c000] BOOTMEM
> > #62 [0080380000 - 008039c000] BOOTMEM
> > #63 [0131e00000 - 0131e1c000] BOOTMEM
> > #64 [0131e80000 - 0131e9c000] BOOTMEM
> > #65 [0131f00000 - 0131f1c000] BOOTMEM
> > #34 [01b0005180 - 01b0025180] BOOTMEM
> > #35 [0002404000 - 0002405000] BOOTMEM
> > #36 [00023dcb80 - 00023dcbc1] BOOTMEM
> > #37 [00023dcc00 - 00023dccc9] BOOTMEM
> > #38 [00023dcd00 - 00023dcfd8] BOOTMEM
> > #39 [0002403240 - 00024032a8] BOOTMEM
> > #40 [00024032c0 - 0002403328] BOOTMEM
> > #41 [0002403340 - 00024033a8] BOOTMEM
> > #42 [00024033c0 - 0002403428] BOOTMEM
> > #43 [0002403440 - 00024034a8] BOOTMEM
> > #44 [00024034c0 - 0002403528] BOOTMEM
> > #45 [0002403540 - 00024035a8] BOOTMEM
> > #46 [00024035c0 - 0002403628] BOOTMEM
> > #47 [0002403640 - 00024036a8] BOOTMEM
> > #48 [00024036c0 - 0002403728] BOOTMEM
> > #49 [0002403740 - 00024037a8] BOOTMEM
> > #50 [00024037c0 - 0002403828] BOOTMEM
> > #51 [0002403840 - 0002403860] BOOTMEM
> > #52 [0002403880 - 00024038a0] BOOTMEM
> > #53 [00024038c0 - 0002403958] BOOTMEM
> > #54 [0002403980 - 0002403a18] BOOTMEM
> > #55 [0002600000 - 000261c000] BOOTMEM
> > #56 [0002680000 - 000269c000] BOOTMEM
> > #57 [0002700000 - 000271c000] BOOTMEM
> > #58 [0002780000 - 000279c000] BOOTMEM
> > #59 [0080200000 - 008021c000] BOOTMEM
> > #60 [0080280000 - 008029c000] BOOTMEM
> > #61 [0080300000 - 008031c000] BOOTMEM
> > #62 [0080380000 - 008039c000] BOOTMEM
> > #63 [0131e00000 - 0131e1c000] BOOTMEM
> > #64 [0131e80000 - 0131e9c000] BOOTMEM
> > #65 [0131f00000 - 0131f1c000] BOOTMEM
> > #66 [0131f80000 - 0131f9c000] BOOTMEM
> > #67 [01b1e00000 - 01b1e1c000] BOOTMEM
> > #68 [01b1e80000 - 01b1e9c000] BOOTMEM
> > #69 [01b1f00000 - 01b1f1c000] BOOTMEM
> > #70 [01b1f80000 - 01b1f9c000] BOOTMEM
> > #71 [0002403a40 - 0002403a60] BOOTMEM
> > #72 [0002403a80 - 0002403aa0] BOOTMEM
> > #73 [0002403ac0 - 0002403b00] BOOTMEM
> > #74 [0002403b00 - 0002403b80] BOOTMEM
> > #75 [0002403b80 - 0002403cb0] BOOTMEM
> > #76 [0002403cc0 - 0002403d10] BOOTMEM
> > #77 [0002403d40 - 0002403d90] BOOTMEM
> > #78 [0002405000 - 000240d000] BOOTMEM
> > #79 [0020000000 - 0024000000] BOOTMEM
> > #80 [0002403dc0 - 0002403de0] BOOTMEM
> > #81 [0004800000 - 0008800000] BOOTMEM
> > #82 [000240d000 - 000242d000] BOOTMEM
> > #83 [000242d000 - 000246d000] BOOTMEM
> > #84 [000001ee40 - 0000026e40] BOOTMEM
> > 27 40 - 80 9d
> > 100 100 - 1000 1000
> > 246d 2480 - 2600 2600
> > 261c 2640 - 2680 2680
> > 269c 26c0 - 2700 2700
> > 271c 2740 - 2780 2780
> > 279c 27c0 - 2bc0 2be4
> > 2be6 - 2c00
> > 8800 8800 - 20000 20000
> > 24000 24000 - 37500 3753c
> > 37ff0 38000 - 80000 80000
> > 80031 80040 - 80200 80200
> > 8021c 80240 - 80280 80280
> > 8029c 802c0 - 80300 80300
> > 8031c 80340 - 80380 80380
> > 8039c 803c0 - cff00 cff00
> > 100005 100040 - 100200 100200
> > 102000 102000 - 130000 130000
> > 130026 130040 - 130200 130200
> > 131e1c 131e40 - 131e80 131e80
> > 131e9c 131ec0 - 131f00 131f00
> > 131f1c 131f40 - 131f80 131f80
> > 131f9c 131fc0 - 1b0000 1b0000
> > 1b0026 1b0040 - 1b0200 1b0200
> > 1b1e1c 1b1e40 - 1b1e80 1b1e80
> > 1b1e9c 1b1ec0 - 1b1f00 1b1f00
> > 1b1f1c 1b1f40 - 1b1f80 1b1f80
> > 1b1f9c 1b1fc0 - 230000 230000
> >
> > === cut here ===
> >
> > The first part (the early reservations themselves with the names) are
> > fine, but the numbers that follow without any other explanation seem to be
> > just completely useless to me ...
> >
> > I haven't yet looked at which code actually introduced this, but I guess
> > we should just remove it ... ?
>
> OK, this has been introduced by
>
> commit 08677214e318297f228237be0042aac754f48f1d
> Author: Yinghai Lu <yinghai@...nel.org>
> Date: Wed Feb 10 01:20:20 2010 -0800
>
> x86: Make 64 bit use early_res instead of bootmem before slab
>
> and is caused by forgotten (I guess) debugging output while freeing the
> pages when CONFIG_NO_BOOTMEM is set. Please consider applying the
> following patch to reduce noise.
>
>
>
> From: Jiri Kosina <jkosina@...e.cz>
> Subject: [PATCH] x86: remove early_res debug output
>
> Commit 08677214e318297 ("x86: Make 64 bit use early_res instead of bootmem
> before slab") introduced early_res replacement for bootmem, but left code
> in __free_pages_memory() which dumps all the ranges that are beeing freed,
> without any additional information, causing some noise in dmesg during
> bootup.
>
> Just remove printing of the ranges, that doesn't provide anything useful
> anyway.
>
> Signed-off-by: Jiri Kosina <jkosina@...e.cz>
>
> ---
>
> mm/bootmem.c | 7 -------
> 1 files changed, 0 insertions(+), 7 deletions(-)
>
> diff --git a/mm/bootmem.c b/mm/bootmem.c
> index d7c791e..9754c26 100644
> --- a/mm/bootmem.c
> +++ b/mm/bootmem.c
> @@ -180,19 +180,12 @@ static void __init __free_pages_memory(unsigned long start, unsigned long end)
> end_aligned = end & ~(BITS_PER_LONG - 1);
>
> if (end_aligned <= start_aligned) {
> -#if 1
> - printk(KERN_DEBUG " %lx - %lx\n", start, end);
> -#endif
> for (i = start; i < end; i++)
> __free_pages_bootmem(pfn_to_page(i), 0);
>
> return;
> }
>
> -#if 1
> - printk(KERN_DEBUG " %lx %lx - %lx %lx\n",
> - start, start_aligned, end_aligned, end);
> -#endif
> for (i = start; i < start_aligned; i++)
> __free_pages_bootmem(pfn_to_page(i), 0);
Please also remove the other KERN_DEBUG leftovers - the #if 0 variants.
Thanks,
Ingo
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