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55 lines
1.6 KiB
55 lines
1.6 KiB
# System calls
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On Linux and Android (userdebug builds only) Perfetto can keep track of system
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calls.
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Right now only the syscall number is recorded in the trace, the arguments are
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not stored to limit the trace size overhead.
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At import time, the Trace Processor uses an internal syscall mapping table,
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currently supporting x86, x86_64, ArmEabi, aarch32 and aarch64. These tables are
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generated through the
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[`extract_linux_syscall_tables`](/tools/extract_linux_syscall_tables) script.
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## UI
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At the UI level system calls are shown inlined with the per-thread slice tracks:
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## SQL
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At the SQL level, syscalls are no different than any other userspace slice
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event. They get interleaved in the per-thread slice stack and can be easily
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filtered by looking for the 'sys_' prefix:
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```sql
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select ts, dur, t.name as thread, s.name, depth from slices as s
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left join thread_track as tt on s.track_id = tt.id
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left join thread as t on tt.utid = t.utid
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where s.name like 'sys_%'
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```
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ts | dur | thread | name
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---|-----|--------|------
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856325324372751 | 439867648 | s.nexuslauncher | sys_epoll_pwait
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856325324376970 | 990 | FpsThrottlerThr | sys_recvfrom
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856325324378376 | 2657 | surfaceflinger | sys_ioctl
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856325324419574 | 1250 | android.anim.lf | sys_recvfrom
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856325324428168 | 27344 | android.anim.lf | sys_ioctl
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856325324451345 | 573 | FpsThrottlerThr | sys_getuid
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## TraceConfig
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```protobuf
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data_sources: {
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config {
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name: "linux.ftrace"
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ftrace_config {
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ftrace_events: "raw_syscalls/sys_enter"
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ftrace_events: "raw_syscalls/sys_exit"
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}
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}
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}
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```
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