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Date: Mon, 23 Oct 2006 14:23:07 -0700 From: Mike Kravetz <kravetz@...ibm.com> To: linux-kernel@...r.kernel.org Subject: [RT] scheduling and oprofile I've been trying to use oprofile on an RT kernel to look at some performance issues. While running I notice the following sent to the console: BUG: scheduling with irqs disabled: java/0x00000000/4521 caller is rt_mutex_slowlock+0x156/0x1dd [<c032051a>] schedule+0x65/0xd2 (8) [<c0321338>] rt_mutex_slowlock+0x156/0x1dd (12) [<c032142a>] rt_mutex_lock+0x24/0x28 (72) [<c0134904>] rt_down_read+0x38/0x3b (20) [<c0322a89>] do_page_fault+0xe3/0x52d (12) [<c03229a6>] do_page_fault+0x0/0x52d (76) [<c01033bb>] error_code+0x4f/0x54 (8) [<c01ce6d0>] __copy_from_user_ll+0x55/0x7c (44) [<f89be7ef>] dump_user_backtrace+0x2e/0x56 [oprofile] (24) [<c0134869>] rt_up_read+0x3e/0x41 (20) [<f89be864>] x86_backtrace+0x4a/0x5a [oprofile] (20) [<f89bd53a>] oprofile_add_sample+0x73/0x89 [oprofile] (20) [<f89beea3>] athlon_check_ctrs+0x22/0x4a [oprofile] (32) [<f89be8c5>] nmi_callback+0x18/0x1b [oprofile] (28) [<c01041ff>] do_nmi+0x24/0x33 (12) [<c0103462>] nmi_stack_correct+0x1d/0x22 (16) It seems strange to me that oprofile would be calling '__copy_from_user_ll' in this context. I can see why the changes made for RT locking expose this. But, doesn't this issue also exist on non-RT (default) kernels? What happens when we generate a page fault in this context on non-RT kernels? -- Mike - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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