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fc54b9bf15
(stable-branch of Openmoko) git-svn-id: svn://svn.openwrt.org/openwrt/trunk@13613 3c298f89-4303-0410-b956-a3cf2f4a3e73
65 lines
2.8 KiB
Diff
65 lines
2.8 KiB
Diff
From 287b292cf95edbd82dc63085ae5f0167a6e8141f Mon Sep 17 00:00:00 2001
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From: Jason Uhlenkott <jasonuhl@jasonuhl.org>
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Date: Tue, 15 Jul 2008 11:37:45 +0100
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Subject: [PATCH] sdio: use interruptible sleep in kthread main loops
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My FreeRunner's load average was leveling off at 2.00 as a result of
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these two kernel threads:
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SDIO Helper D c02b4500 0 255 2
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[<c02b4298>] (schedule+0x0/0x2d4) from [<c02b4040>] (__down+0x100/0x158)
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[<c02b3f40>] (__down+0x0/0x158) from [<c02b3e2c>] (__down_failed+0xc/0x20)
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r7:00000000 r6:c01fbd64 r5:c7cb7134 r4:c7d58000
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[<c01fa6fc>] (CardDetectHelperFunction+0x0/0x1ac) from [<c01fbd80>] (HelperLaunch+0x1c/0x28)
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r5:c7cb7134 r4:c7cb7134
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[<c01fbd64>] (HelperLaunch+0x0/0x28) from [<c005bbd0>] (kthread+0x60/0x94)
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r4:c7d58000
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[<c005bb70>] (kthread+0x0/0x94) from [<c0048f7c>] (do_exit+0x0/0x744)
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r6:00000000 r5:00000000 r4:00000000
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SDIO Helper D c02b4500 0 259 2
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[<c02b4298>] (schedule+0x0/0x2d4) from [<c02b4040>] (__down+0x100/0x158)
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[<c02b3f40>] (__down+0x0/0x158) from [<c02b3e2c>] (__down_failed+0xc/0x20)
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r7:c0382bb4 r6:c0382b34 r5:c7d5a000 r4:00000001
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[<c01f9104>] (SDIOIrqHelperFunction+0x0/0x29c) from [<c01fbd80>] (HelperLaunch+0x1c/0x28)
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r8:00000000 r7:00000000 r6:c01fbd64 r5:c0382bb4 r4:c0382bb4
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[<c01fbd64>] (HelperLaunch+0x0/0x28) from [<c005bbd0>] (kthread+0x60/0x94)
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r4:c7d5a000
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[<c005bb70>] (kthread+0x0/0x94) from [<c0048f7c>] (do_exit+0x0/0x744)
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r6:00000000 r5:00000000 r4:00000000
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This fixes them to use interruptible sleep primitives while waiting in
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their main loops, as is conventional for kernel threads. They can't
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actually be interrupted since kernel threads ignore all signals, but
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by sleeping this way they get classified as long term waiters, and
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don't get counted as running for purposes of load average calculation.
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This is intended as a minimal fix. In the longer term, it'd probably
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make sense to replace the semaphores with completions or something,
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and to do away with some of these StudlyCapped wrapper functions.
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Signed-off-by: Jason Uhlenkott <jasonuhl@jasonuhl.org>
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--
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This is untested, but what could possibly go wrong? ;)
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---
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include/linux/sdio/ctsystem_linux.h | 2 +-
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1 files changed, 1 insertions(+), 1 deletions(-)
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diff --git a/include/linux/sdio/ctsystem_linux.h b/include/linux/sdio/ctsystem_linux.h
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index 0de89a6..c9e44f2 100644
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--- a/include/linux/sdio/ctsystem_linux.h
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+++ b/include/linux/sdio/ctsystem_linux.h
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@@ -968,7 +968,7 @@ typedef struct _OSKERNEL_HELPER {
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}
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+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
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-#define SD_WAIT_FOR_WAKEUP(p) SignalWait(&(p)->WakeSignal);
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+#define SD_WAIT_FOR_WAKEUP(p) SignalWaitInterruptible(&(p)->WakeSignal);
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#define CT_LE16_TO_CPU_ENDIAN(x) __le16_to_cpu(x)
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#define CT_LE32_TO_CPU_ENDIAN(x) __le32_to_cpu(x)
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--
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1.5.6.5
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