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Kernel: Implement a simple process time profiler
The kernel now supports basic profiling of all the threads in a process by calling profiling_enable(pid_t). You finish the profiling by calling profiling_disable(pid_t). This all works by recording thread stacks when the timer interrupt fires and the current thread is in a process being profiled. Note that symbolication is deferred until profiling_disable() to avoid adding more noise than necessary to the profile. A simple "/bin/profile" command is included here that can be used to start/stop profiling like so: $ profile 10 on ... wait ... $ profile 10 off After a profile has been recorded, it can be fetched in /proc/profile There are various limits (or "bugs") on this mechanism at the moment: - Only one process can be profiled at a time. - We allocate 8MB for the samples, if you use more space, things will not work, and probably break a bit. - Things will probably fall apart if the profiled process dies during profiling, or while extracing /proc/profile
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13 changed files with 388 additions and 135 deletions
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@ -23,6 +23,7 @@
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#include <Kernel/Net/TCPSocket.h>
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#include <Kernel/Net/UDPSocket.h>
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#include <Kernel/PCI.h>
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#include <Kernel/Profiling.h>
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#include <Kernel/VM/MemoryManager.h>
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#include <Kernel/VM/PurgeableVMObject.h>
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#include <LibC/errno_numbers.h>
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@ -55,6 +56,7 @@ enum ProcFileType {
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FI_Root_uptime,
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FI_Root_cmdline,
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FI_Root_modules,
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FI_Root_profile,
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FI_Root_self, // symlink
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FI_Root_sys, // directory
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FI_Root_net, // directory
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@ -353,6 +355,31 @@ Optional<KBuffer> procfs$modules(InodeIdentifier)
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return builder.build();
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}
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Optional<KBuffer> procfs$profile(InodeIdentifier)
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{
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InterruptDisabler disabler;
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KBufferBuilder builder;
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JsonArraySerializer array(builder);
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Profiling::for_each_sample([&](auto& sample) {
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auto object = array.add_object();
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object.add("pid", sample.pid);
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object.add("tid", sample.tid);
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object.add("timestamp", sample.timestamp);
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auto sample_array = object.add_array("samples");
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for (size_t i = 0; i < Profiling::max_stack_frame_count; ++i) {
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if (sample.frames[i] == 0)
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break;
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auto frame_object = sample_array.add_object();
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frame_object.add("address", JsonValue((u32)sample.frames[i]));
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frame_object.add("symbol", sample.symbolicated_frames[i]);
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frame_object.finish();
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}
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sample_array.finish();
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});
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array.finish();
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return builder.build();
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}
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Optional<KBuffer> procfs$net_adapters(InodeIdentifier)
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{
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KBufferBuilder builder;
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@ -1333,6 +1360,7 @@ ProcFS::ProcFS()
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m_entries[FI_Root_uptime] = { "uptime", FI_Root_uptime, procfs$uptime };
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m_entries[FI_Root_cmdline] = { "cmdline", FI_Root_cmdline, procfs$cmdline };
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m_entries[FI_Root_modules] = { "modules", FI_Root_modules, procfs$modules };
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m_entries[FI_Root_profile] = { "profile", FI_Root_profile, procfs$profile };
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m_entries[FI_Root_sys] = { "sys", FI_Root_sys };
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m_entries[FI_Root_net] = { "net", FI_Root_net };
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