97e1c18e8d
Implementation of kernel tracepoints. Inspired from the Linux Kernel Markers. Allows complete typing verification by declaring both tracing statement inline functions and probe registration/unregistration static inline functions within the same macro "DEFINE_TRACE". No format string is required. See the tracepoint Documentation and Samples patches for usage examples. Taken from the documentation patch : "A tracepoint placed in code provides a hook to call a function (probe) that you can provide at runtime. A tracepoint can be "on" (a probe is connected to it) or "off" (no probe is attached). When a tracepoint is "off" it has no effect, except for adding a tiny time penalty (checking a condition for a branch) and space penalty (adding a few bytes for the function call at the end of the instrumented function and adds a data structure in a separate section). When a tracepoint is "on", the function you provide is called each time the tracepoint is executed, in the execution context of the caller. When the function provided ends its execution, it returns to the caller (continuing from the tracepoint site). You can put tracepoints at important locations in the code. They are lightweight hooks that can pass an arbitrary number of parameters, which prototypes are described in a tracepoint declaration placed in a header file." Addition and removal of tracepoints is synchronized by RCU using the scheduler (and preempt_disable) as guarantees to find a quiescent state (this is really RCU "classic"). The update side uses rcu_barrier_sched() with call_rcu_sched() and the read/execute side uses "preempt_disable()/preempt_enable()". We make sure the previous array containing probes, which has been scheduled for deletion by the rcu callback, is indeed freed before we proceed to the next update. It therefore limits the rate of modification of a single tracepoint to one update per RCU period. The objective here is to permit fast batch add/removal of probes on _different_ tracepoints. Changelog : - Use #name ":" #proto as string to identify the tracepoint in the tracepoint table. This will make sure not type mismatch happens due to connexion of a probe with the wrong type to a tracepoint declared with the same name in a different header. - Add tracepoint_entry_free_old. - Change __TO_TRACE to get rid of the 'i' iterator. Masami Hiramatsu <mhiramat@redhat.com> : Tested on x86-64. Performance impact of a tracepoint : same as markers, except that it adds about 70 bytes of instructions in an unlikely branch of each instrumented function (the for loop, the stack setup and the function call). It currently adds a memory read, a test and a conditional branch at the instrumentation site (in the hot path). Immediate values will eventually change this into a load immediate, test and branch, which removes the memory read which will make the i-cache impact smaller (changing the memory read for a load immediate removes 3-4 bytes per site on x86_32 (depending on mov prefixes), or 7-8 bytes on x86_64, it also saves the d-cache hit). About the performance impact of tracepoints (which is comparable to markers), even without immediate values optimizations, tests done by Hideo Aoki on ia64 show no regression. His test case was using hackbench on a kernel where scheduler instrumentation (about 5 events in code scheduler code) was added. Quoting Hideo Aoki about Markers : I evaluated overhead of kernel marker using linux-2.6-sched-fixes git tree, which includes several markers for LTTng, using an ia64 server. While the immediate trace mark feature isn't implemented on ia64, there is no major performance regression. So, I think that we don't have any issues to propose merging marker point patches into Linus's tree from the viewpoint of performance impact. I prepared two kernels to evaluate. The first one was compiled without CONFIG_MARKERS. The second one was enabled CONFIG_MARKERS. I downloaded the original hackbench from the following URL: http://devresources.linux-foundation.org/craiger/hackbench/src/hackbench.c I ran hackbench 5 times in each condition and calculated the average and difference between the kernels. The parameter of hackbench: every 50 from 50 to 800 The number of CPUs of the server: 2, 4, and 8 Below is the results. As you can see, major performance regression wasn't found in any case. Even if number of processes increases, differences between marker-enabled kernel and marker- disabled kernel doesn't increase. Moreover, if number of CPUs increases, the differences doesn't increase either. Curiously, marker-enabled kernel is better than marker-disabled kernel in more than half cases, although I guess it comes from the difference of memory access pattern. * 2 CPUs Number of | without | with | diff | diff | processes | Marker [Sec] | Marker [Sec] | [Sec] | [%] | -------------------------------------------------------------- 50 | 4.811 | 4.872 | +0.061 | +1.27 | 100 | 9.854 | 10.309 | +0.454 | +4.61 | 150 | 15.602 | 15.040 | -0.562 | -3.6 | 200 | 20.489 | 20.380 | -0.109 | -0.53 | 250 | 25.798 | 25.652 | -0.146 | -0.56 | 300 | 31.260 | 30.797 | -0.463 | -1.48 | 350 | 36.121 | 35.770 | -0.351 | -0.97 | 400 | 42.288 | 42.102 | -0.186 | -0.44 | 450 | 47.778 | 47.253 | -0.526 | -1.1 | 500 | 51.953 | 52.278 | +0.325 | +0.63 | 550 | 58.401 | 57.700 | -0.701 | -1.2 | 600 | 63.334 | 63.222 | -0.112 | -0.18 | 650 | 68.816 | 68.511 | -0.306 | -0.44 | 700 | 74.667 | 74.088 | -0.579 | -0.78 | 750 | 78.612 | 79.582 | +0.970 | +1.23 | 800 | 85.431 | 85.263 | -0.168 | -0.2 | -------------------------------------------------------------- * 4 CPUs Number of | without | with | diff | diff | processes | Marker [Sec] | Marker [Sec] | [Sec] | [%] | -------------------------------------------------------------- 50 | 2.586 | 2.584 | -0.003 | -0.1 | 100 | 5.254 | 5.283 | +0.030 | +0.56 | 150 | 8.012 | 8.074 | +0.061 | +0.76 | 200 | 11.172 | 11.000 | -0.172 | -1.54 | 250 | 13.917 | 14.036 | +0.119 | +0.86 | 300 | 16.905 | 16.543 | -0.362 | -2.14 | 350 | 19.901 | 20.036 | +0.135 | +0.68 | 400 | 22.908 | 23.094 | +0.186 | +0.81 | 450 | 26.273 | 26.101 | -0.172 | -0.66 | 500 | 29.554 | 29.092 | -0.461 | -1.56 | 550 | 32.377 | 32.274 | -0.103 | -0.32 | 600 | 35.855 | 35.322 | -0.533 | -1.49 | 650 | 39.192 | 38.388 | -0.804 | -2.05 | 700 | 41.744 | 41.719 | -0.025 | -0.06 | 750 | 45.016 | 44.496 | -0.520 | -1.16 | 800 | 48.212 | 47.603 | -0.609 | -1.26 | -------------------------------------------------------------- * 8 CPUs Number of | without | with | diff | diff | processes | Marker [Sec] | Marker [Sec] | [Sec] | [%] | -------------------------------------------------------------- 50 | 2.094 | 2.072 | -0.022 | -1.07 | 100 | 4.162 | 4.273 | +0.111 | +2.66 | 150 | 6.485 | 6.540 | +0.055 | +0.84 | 200 | 8.556 | 8.478 | -0.078 | -0.91 | 250 | 10.458 | 10.258 | -0.200 | -1.91 | 300 | 12.425 | 12.750 | +0.325 | +2.62 | 350 | 14.807 | 14.839 | +0.032 | +0.22 | 400 | 16.801 | 16.959 | +0.158 | +0.94 | 450 | 19.478 | 19.009 | -0.470 | -2.41 | 500 | 21.296 | 21.504 | +0.208 | +0.98 | 550 | 23.842 | 23.979 | +0.137 | +0.57 | 600 | 26.309 | 26.111 | -0.198 | -0.75 | 650 | 28.705 | 28.446 | -0.259 | -0.9 | 700 | 31.233 | 31.394 | +0.161 | +0.52 | 750 | 34.064 | 33.720 | -0.344 | -1.01 | 800 | 36.320 | 36.114 | -0.206 | -0.57 | -------------------------------------------------------------- Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Acked-by: Masami Hiramatsu <mhiramat@redhat.com> Acked-by: 'Peter Zijlstra' <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
397 lines
12 KiB
C
397 lines
12 KiB
C
#ifndef LOAD_OFFSET
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#define LOAD_OFFSET 0
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#endif
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#ifndef VMLINUX_SYMBOL
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#define VMLINUX_SYMBOL(_sym_) _sym_
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#endif
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/* Align . to a 8 byte boundary equals to maximum function alignment. */
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#define ALIGN_FUNCTION() . = ALIGN(8)
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/* The actual configuration determine if the init/exit sections
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* are handled as text/data or they can be discarded (which
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* often happens at runtime)
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*/
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#ifdef CONFIG_HOTPLUG
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#define DEV_KEEP(sec) *(.dev##sec)
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#define DEV_DISCARD(sec)
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#else
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#define DEV_KEEP(sec)
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#define DEV_DISCARD(sec) *(.dev##sec)
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#endif
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#ifdef CONFIG_HOTPLUG_CPU
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#define CPU_KEEP(sec) *(.cpu##sec)
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#define CPU_DISCARD(sec)
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#else
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#define CPU_KEEP(sec)
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#define CPU_DISCARD(sec) *(.cpu##sec)
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#endif
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#if defined(CONFIG_MEMORY_HOTPLUG)
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#define MEM_KEEP(sec) *(.mem##sec)
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#define MEM_DISCARD(sec)
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#else
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#define MEM_KEEP(sec)
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#define MEM_DISCARD(sec) *(.mem##sec)
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#endif
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/* .data section */
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#define DATA_DATA \
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*(.data) \
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*(.data.init.refok) \
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*(.ref.data) \
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DEV_KEEP(init.data) \
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DEV_KEEP(exit.data) \
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CPU_KEEP(init.data) \
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CPU_KEEP(exit.data) \
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MEM_KEEP(init.data) \
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MEM_KEEP(exit.data) \
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. = ALIGN(8); \
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VMLINUX_SYMBOL(__start___markers) = .; \
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*(__markers) \
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VMLINUX_SYMBOL(__stop___markers) = .; \
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VMLINUX_SYMBOL(__start___tracepoints) = .; \
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*(__tracepoints) \
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VMLINUX_SYMBOL(__stop___tracepoints) = .;
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#define RO_DATA(align) \
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. = ALIGN((align)); \
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.rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \
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VMLINUX_SYMBOL(__start_rodata) = .; \
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*(.rodata) *(.rodata.*) \
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*(__vermagic) /* Kernel version magic */ \
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*(__markers_strings) /* Markers: strings */ \
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*(__tracepoints_strings)/* Tracepoints: strings */ \
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} \
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\
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.rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \
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*(.rodata1) \
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} \
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\
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BUG_TABLE \
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\
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/* PCI quirks */ \
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.pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \
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VMLINUX_SYMBOL(__start_pci_fixups_early) = .; \
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*(.pci_fixup_early) \
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VMLINUX_SYMBOL(__end_pci_fixups_early) = .; \
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VMLINUX_SYMBOL(__start_pci_fixups_header) = .; \
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*(.pci_fixup_header) \
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VMLINUX_SYMBOL(__end_pci_fixups_header) = .; \
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VMLINUX_SYMBOL(__start_pci_fixups_final) = .; \
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*(.pci_fixup_final) \
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VMLINUX_SYMBOL(__end_pci_fixups_final) = .; \
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VMLINUX_SYMBOL(__start_pci_fixups_enable) = .; \
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*(.pci_fixup_enable) \
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VMLINUX_SYMBOL(__end_pci_fixups_enable) = .; \
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VMLINUX_SYMBOL(__start_pci_fixups_resume) = .; \
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*(.pci_fixup_resume) \
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VMLINUX_SYMBOL(__end_pci_fixups_resume) = .; \
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VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .; \
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*(.pci_fixup_resume_early) \
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VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .; \
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VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .; \
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*(.pci_fixup_suspend) \
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VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .; \
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} \
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\
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/* Built-in firmware blobs */ \
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.builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \
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VMLINUX_SYMBOL(__start_builtin_fw) = .; \
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*(.builtin_fw) \
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VMLINUX_SYMBOL(__end_builtin_fw) = .; \
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} \
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\
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/* RapidIO route ops */ \
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.rio_route : AT(ADDR(.rio_route) - LOAD_OFFSET) { \
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VMLINUX_SYMBOL(__start_rio_route_ops) = .; \
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*(.rio_route_ops) \
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VMLINUX_SYMBOL(__end_rio_route_ops) = .; \
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} \
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\
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TRACEDATA \
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\
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/* Kernel symbol table: Normal symbols */ \
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__ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \
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VMLINUX_SYMBOL(__start___ksymtab) = .; \
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*(__ksymtab) \
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VMLINUX_SYMBOL(__stop___ksymtab) = .; \
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} \
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\
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/* Kernel symbol table: GPL-only symbols */ \
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__ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \
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VMLINUX_SYMBOL(__start___ksymtab_gpl) = .; \
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*(__ksymtab_gpl) \
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VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .; \
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} \
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\
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/* Kernel symbol table: Normal unused symbols */ \
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__ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \
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VMLINUX_SYMBOL(__start___ksymtab_unused) = .; \
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*(__ksymtab_unused) \
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VMLINUX_SYMBOL(__stop___ksymtab_unused) = .; \
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} \
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\
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/* Kernel symbol table: GPL-only unused symbols */ \
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__ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
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VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .; \
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*(__ksymtab_unused_gpl) \
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VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .; \
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} \
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\
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/* Kernel symbol table: GPL-future-only symbols */ \
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__ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
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VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .; \
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*(__ksymtab_gpl_future) \
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VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .; \
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} \
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\
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/* Kernel symbol table: Normal symbols */ \
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__kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \
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VMLINUX_SYMBOL(__start___kcrctab) = .; \
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*(__kcrctab) \
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VMLINUX_SYMBOL(__stop___kcrctab) = .; \
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} \
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\
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/* Kernel symbol table: GPL-only symbols */ \
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__kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \
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VMLINUX_SYMBOL(__start___kcrctab_gpl) = .; \
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*(__kcrctab_gpl) \
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VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .; \
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} \
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\
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/* Kernel symbol table: Normal unused symbols */ \
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__kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \
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VMLINUX_SYMBOL(__start___kcrctab_unused) = .; \
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*(__kcrctab_unused) \
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VMLINUX_SYMBOL(__stop___kcrctab_unused) = .; \
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} \
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\
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/* Kernel symbol table: GPL-only unused symbols */ \
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__kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
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VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .; \
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*(__kcrctab_unused_gpl) \
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VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .; \
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} \
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\
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/* Kernel symbol table: GPL-future-only symbols */ \
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__kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
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VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .; \
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*(__kcrctab_gpl_future) \
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VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .; \
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} \
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\
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/* Kernel symbol table: strings */ \
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__ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
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*(__ksymtab_strings) \
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} \
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\
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/* __*init sections */ \
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__init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \
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*(.ref.rodata) \
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DEV_KEEP(init.rodata) \
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DEV_KEEP(exit.rodata) \
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CPU_KEEP(init.rodata) \
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CPU_KEEP(exit.rodata) \
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MEM_KEEP(init.rodata) \
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MEM_KEEP(exit.rodata) \
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} \
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\
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/* Built-in module parameters. */ \
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__param : AT(ADDR(__param) - LOAD_OFFSET) { \
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VMLINUX_SYMBOL(__start___param) = .; \
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*(__param) \
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VMLINUX_SYMBOL(__stop___param) = .; \
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. = ALIGN((align)); \
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VMLINUX_SYMBOL(__end_rodata) = .; \
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} \
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. = ALIGN((align));
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/* RODATA provided for backward compatibility.
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* All archs are supposed to use RO_DATA() */
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#define RODATA RO_DATA(4096)
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#define SECURITY_INIT \
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.security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
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VMLINUX_SYMBOL(__security_initcall_start) = .; \
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*(.security_initcall.init) \
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VMLINUX_SYMBOL(__security_initcall_end) = .; \
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}
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/* .text section. Map to function alignment to avoid address changes
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* during second ld run in second ld pass when generating System.map */
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#define TEXT_TEXT \
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ALIGN_FUNCTION(); \
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*(.text.hot) \
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*(.text) \
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*(.ref.text) \
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*(.text.init.refok) \
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*(.exit.text.refok) \
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DEV_KEEP(init.text) \
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DEV_KEEP(exit.text) \
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CPU_KEEP(init.text) \
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CPU_KEEP(exit.text) \
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MEM_KEEP(init.text) \
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MEM_KEEP(exit.text) \
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*(.text.unlikely)
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/* sched.text is aling to function alignment to secure we have same
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* address even at second ld pass when generating System.map */
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#define SCHED_TEXT \
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ALIGN_FUNCTION(); \
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VMLINUX_SYMBOL(__sched_text_start) = .; \
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*(.sched.text) \
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VMLINUX_SYMBOL(__sched_text_end) = .;
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/* spinlock.text is aling to function alignment to secure we have same
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* address even at second ld pass when generating System.map */
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#define LOCK_TEXT \
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ALIGN_FUNCTION(); \
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VMLINUX_SYMBOL(__lock_text_start) = .; \
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*(.spinlock.text) \
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VMLINUX_SYMBOL(__lock_text_end) = .;
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#define KPROBES_TEXT \
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ALIGN_FUNCTION(); \
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VMLINUX_SYMBOL(__kprobes_text_start) = .; \
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*(.kprobes.text) \
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VMLINUX_SYMBOL(__kprobes_text_end) = .;
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/* Section used for early init (in .S files) */
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#define HEAD_TEXT *(.head.text)
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/* init and exit section handling */
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#define INIT_DATA \
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*(.init.data) \
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DEV_DISCARD(init.data) \
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DEV_DISCARD(init.rodata) \
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CPU_DISCARD(init.data) \
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CPU_DISCARD(init.rodata) \
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MEM_DISCARD(init.data) \
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MEM_DISCARD(init.rodata)
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#define INIT_TEXT \
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*(.init.text) \
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DEV_DISCARD(init.text) \
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CPU_DISCARD(init.text) \
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MEM_DISCARD(init.text)
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#define EXIT_DATA \
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*(.exit.data) \
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DEV_DISCARD(exit.data) \
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DEV_DISCARD(exit.rodata) \
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CPU_DISCARD(exit.data) \
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CPU_DISCARD(exit.rodata) \
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MEM_DISCARD(exit.data) \
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MEM_DISCARD(exit.rodata)
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#define EXIT_TEXT \
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*(.exit.text) \
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DEV_DISCARD(exit.text) \
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CPU_DISCARD(exit.text) \
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MEM_DISCARD(exit.text)
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/* DWARF debug sections.
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Symbols in the DWARF debugging sections are relative to
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the beginning of the section so we begin them at 0. */
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#define DWARF_DEBUG \
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/* DWARF 1 */ \
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.debug 0 : { *(.debug) } \
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.line 0 : { *(.line) } \
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/* GNU DWARF 1 extensions */ \
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.debug_srcinfo 0 : { *(.debug_srcinfo) } \
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.debug_sfnames 0 : { *(.debug_sfnames) } \
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/* DWARF 1.1 and DWARF 2 */ \
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.debug_aranges 0 : { *(.debug_aranges) } \
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.debug_pubnames 0 : { *(.debug_pubnames) } \
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/* DWARF 2 */ \
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.debug_info 0 : { *(.debug_info \
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.gnu.linkonce.wi.*) } \
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.debug_abbrev 0 : { *(.debug_abbrev) } \
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.debug_line 0 : { *(.debug_line) } \
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.debug_frame 0 : { *(.debug_frame) } \
|
|
.debug_str 0 : { *(.debug_str) } \
|
|
.debug_loc 0 : { *(.debug_loc) } \
|
|
.debug_macinfo 0 : { *(.debug_macinfo) } \
|
|
/* SGI/MIPS DWARF 2 extensions */ \
|
|
.debug_weaknames 0 : { *(.debug_weaknames) } \
|
|
.debug_funcnames 0 : { *(.debug_funcnames) } \
|
|
.debug_typenames 0 : { *(.debug_typenames) } \
|
|
.debug_varnames 0 : { *(.debug_varnames) } \
|
|
|
|
/* Stabs debugging sections. */
|
|
#define STABS_DEBUG \
|
|
.stab 0 : { *(.stab) } \
|
|
.stabstr 0 : { *(.stabstr) } \
|
|
.stab.excl 0 : { *(.stab.excl) } \
|
|
.stab.exclstr 0 : { *(.stab.exclstr) } \
|
|
.stab.index 0 : { *(.stab.index) } \
|
|
.stab.indexstr 0 : { *(.stab.indexstr) } \
|
|
.comment 0 : { *(.comment) }
|
|
|
|
#ifdef CONFIG_GENERIC_BUG
|
|
#define BUG_TABLE \
|
|
. = ALIGN(8); \
|
|
__bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \
|
|
VMLINUX_SYMBOL(__start___bug_table) = .; \
|
|
*(__bug_table) \
|
|
VMLINUX_SYMBOL(__stop___bug_table) = .; \
|
|
}
|
|
#else
|
|
#define BUG_TABLE
|
|
#endif
|
|
|
|
#ifdef CONFIG_PM_TRACE
|
|
#define TRACEDATA \
|
|
. = ALIGN(4); \
|
|
.tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \
|
|
VMLINUX_SYMBOL(__tracedata_start) = .; \
|
|
*(.tracedata) \
|
|
VMLINUX_SYMBOL(__tracedata_end) = .; \
|
|
}
|
|
#else
|
|
#define TRACEDATA
|
|
#endif
|
|
|
|
#define NOTES \
|
|
.notes : AT(ADDR(.notes) - LOAD_OFFSET) { \
|
|
VMLINUX_SYMBOL(__start_notes) = .; \
|
|
*(.note.*) \
|
|
VMLINUX_SYMBOL(__stop_notes) = .; \
|
|
}
|
|
|
|
#define INITCALLS \
|
|
*(.initcallearly.init) \
|
|
VMLINUX_SYMBOL(__early_initcall_end) = .; \
|
|
*(.initcall0.init) \
|
|
*(.initcall0s.init) \
|
|
*(.initcall1.init) \
|
|
*(.initcall1s.init) \
|
|
*(.initcall2.init) \
|
|
*(.initcall2s.init) \
|
|
*(.initcall3.init) \
|
|
*(.initcall3s.init) \
|
|
*(.initcall4.init) \
|
|
*(.initcall4s.init) \
|
|
*(.initcall5.init) \
|
|
*(.initcall5s.init) \
|
|
*(.initcallrootfs.init) \
|
|
*(.initcall6.init) \
|
|
*(.initcall6s.init) \
|
|
*(.initcall7.init) \
|
|
*(.initcall7s.init)
|
|
|
|
#define PERCPU(align) \
|
|
. = ALIGN(align); \
|
|
VMLINUX_SYMBOL(__per_cpu_start) = .; \
|
|
.data.percpu : AT(ADDR(.data.percpu) - LOAD_OFFSET) { \
|
|
*(.data.percpu.page_aligned) \
|
|
*(.data.percpu) \
|
|
*(.data.percpu.shared_aligned) \
|
|
} \
|
|
VMLINUX_SYMBOL(__per_cpu_end) = .;
|