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| Filename | Latest commit message | Latest commit date |
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44d3bbb6f5
We see our Nehalem machines reporting 'perfevents: irq loop stuck!' in some cases when using perf: perfevents: irq loop stuck! WARNING: CPU: 0 PID: 3485 at arch/x86/events/intel/core.c:2282 intel_pmu_handle_irq+0x37b/0x530 ... RIP: 0010:intel_pmu_handle_irq+0x37b/0x530 ... Call Trace: <NMI> ? perf_event_nmi_handler+0x2e/0x50 ? intel_pmu_save_and_restart+0x50/0x50 perf_event_nmi_handler+0x2e/0x50 nmi_handle+0x6e/0x120 default_do_nmi+0x3e/0x100 do_nmi+0x102/0x160 end_repeat_nmi+0x16/0x50 ... ? native_write_msr+0x6/0x20 ? native_write_msr+0x6/0x20 </NMI> intel_pmu_enable_event+0x1ce/0x1f0 x86_pmu_start+0x78/0xa0 x86_pmu_enable+0x252/0x310 __perf_event_task_sched_in+0x181/0x190 ? __switch_to_asm+0x41/0x70 ? __switch_to_asm+0x35/0x70 ? __switch_to_asm+0x41/0x70 ? __switch_to_asm+0x35/0x70 finish_task_switch+0x158/0x260 __schedule+0x2f6/0x840 ? hrtimer_start_range_ns+0x153/0x210 schedule+0x32/0x80 schedule_hrtimeout_range_clock+0x8a/0x100 ? hrtimer_init+0x120/0x120 ep_poll+0x2f7/0x3a0 ? wake_up_q+0x60/0x60 do_epoll_wait+0xa9/0xc0 __x64_sys_epoll_wait+0x1a/0x20 do_syscall_64+0x4e/0x110 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7fdeb1e96c03 ... Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: acme@kernel.org Cc: Josh Hunt <johunt@akamai.com> Cc: bpuranda@akamai.com Cc: mingo@redhat.com Cc: jolsa@redhat.com Cc: tglx@linutronix.de Cc: namhyung@kernel.org Cc: alexander.shishkin@linux.intel.com Link: https://lkml.kernel.org/r/1566256411-18820-1-git-send-email-johunt@akamai.com |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.