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https://github.com/torvalds/linux.git
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perf trace: Show path associated with fd in live sessions
For live sessions we can just access /proc to map an fd to its path, on a best effort way, i.e. sometimes the fd will have gone away when we try to do the mapping, as it is done in a lazy way, only when a reference to such fd is made then the path will be looked up in /proc. This is disabled when processing perf.data files, where we will have to have a way to get getname events, be it via an on-the-fly 'perf probe' event or after a vfs_getname tracepoint is added to the kernel. A first step will be to synthesize such event for the use cases where the threads in the monitored workload exist already. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/n/tip-1r1ti33ye1666jezu2d8q1c3@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo
parent
3d903aa74a
commit
75b757ca90
@ -36,6 +36,8 @@
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struct syscall_arg {
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unsigned long val;
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struct thread *thread;
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struct trace *trace;
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void *parm;
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u8 idx;
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u8 mask;
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@ -65,6 +67,29 @@ static size_t syscall_arg__scnprintf_strarray(char *bf, size_t size,
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#define SCA_STRARRAY syscall_arg__scnprintf_strarray
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static size_t syscall_arg__scnprintf_fd(char *bf, size_t size,
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struct syscall_arg *arg);
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#define SCA_FD syscall_arg__scnprintf_fd
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static size_t syscall_arg__scnprintf_fd_at(char *bf, size_t size,
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struct syscall_arg *arg)
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{
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int fd = arg->val;
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if (fd == AT_FDCWD)
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return scnprintf(bf, size, "CWD");
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return syscall_arg__scnprintf_fd(bf, size, arg);
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}
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#define SCA_FDAT syscall_arg__scnprintf_fd_at
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static size_t syscall_arg__scnprintf_close_fd(char *bf, size_t size,
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struct syscall_arg *arg);
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#define SCA_CLOSE_FD syscall_arg__scnprintf_close_fd
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static size_t syscall_arg__scnprintf_hex(char *bf, size_t size,
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struct syscall_arg *arg)
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{
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@ -613,28 +638,84 @@ static struct syscall_fmt {
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{ .name = "brk", .hexret = true,
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.arg_scnprintf = { [0] = SCA_HEX, /* brk */ }, },
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{ .name = "clock_gettime", .errmsg = true, STRARRAY(0, clk_id, clockid), },
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{ .name = "close", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_CLOSE_FD, /* fd */ }, },
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{ .name = "connect", .errmsg = true, },
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{ .name = "dup", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
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{ .name = "dup2", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
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{ .name = "dup3", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
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{ .name = "epoll_ctl", .errmsg = true, STRARRAY(1, op, epoll_ctl_ops), },
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{ .name = "eventfd2", .errmsg = true,
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.arg_scnprintf = { [1] = SCA_EFD_FLAGS, /* flags */ }, },
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{ .name = "fcntl", .errmsg = true, STRARRAY(1, cmd, fcntl_cmds), },
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{ .name = "faccessat", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_FDAT, /* dfd */ }, },
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{ .name = "fadvise64", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
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{ .name = "fallocate", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
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{ .name = "fchdir", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
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{ .name = "fchmod", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
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{ .name = "fchmodat", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_FDAT, /* fd */ }, },
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{ .name = "fchown", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
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{ .name = "fchownat", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_FDAT, /* fd */ }, },
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{ .name = "fcntl", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_FD, /* fd */
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[1] = SCA_STRARRAY, /* cmd */ },
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.arg_parm = { [1] = &strarray__fcntl_cmds, /* cmd */ }, },
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{ .name = "fdatasync", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
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{ .name = "flock", .errmsg = true,
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.arg_scnprintf = { [1] = SCA_FLOCK, /* cmd */ }, },
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{ .name = "fstat", .errmsg = true, .alias = "newfstat", },
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{ .name = "fstatat", .errmsg = true, .alias = "newfstatat", },
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.arg_scnprintf = { [0] = SCA_FD, /* fd */
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[1] = SCA_FLOCK, /* cmd */ }, },
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{ .name = "fsetxattr", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
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{ .name = "fstat", .errmsg = true, .alias = "newfstat",
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.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
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{ .name = "fstatat", .errmsg = true, .alias = "newfstatat",
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.arg_scnprintf = { [0] = SCA_FDAT, /* dfd */ }, },
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{ .name = "fstatfs", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
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{ .name = "fsync", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
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{ .name = "ftruncate", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
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{ .name = "futex", .errmsg = true,
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.arg_scnprintf = { [1] = SCA_FUTEX_OP, /* op */ }, },
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{ .name = "futimesat", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_FDAT, /* fd */ }, },
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{ .name = "getdents", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
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{ .name = "getdents64", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
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{ .name = "getitimer", .errmsg = true, STRARRAY(0, which, itimers), },
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{ .name = "getrlimit", .errmsg = true, STRARRAY(0, resource, rlimit_resources), },
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{ .name = "ioctl", .errmsg = true,
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.arg_scnprintf = { [2] = SCA_HEX, /* arg */ }, },
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.arg_scnprintf = { [0] = SCA_FD, /* fd */
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[2] = SCA_HEX, /* arg */ }, },
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{ .name = "kill", .errmsg = true,
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.arg_scnprintf = { [1] = SCA_SIGNUM, /* sig */ }, },
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{ .name = "lseek", .errmsg = true, STRARRAY(2, whence, whences), },
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{ .name = "linkat", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_FDAT, /* fd */ }, },
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{ .name = "lseek", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_FD, /* fd */
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[2] = SCA_STRARRAY, /* whence */ },
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.arg_parm = { [2] = &strarray__whences, /* whence */ }, },
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{ .name = "lstat", .errmsg = true, .alias = "newlstat", },
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{ .name = "madvise", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_HEX, /* start */
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[2] = SCA_MADV_BHV, /* behavior */ }, },
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{ .name = "mkdirat", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_FDAT, /* fd */ }, },
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{ .name = "mknodat", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_FDAT, /* fd */ }, },
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{ .name = "mlock", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_HEX, /* addr */ }, },
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{ .name = "mlockall", .errmsg = true,
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@ -653,26 +734,45 @@ static struct syscall_fmt {
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.arg_scnprintf = { [0] = SCA_HEX, /* addr */ }, },
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{ .name = "munmap", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_HEX, /* addr */ }, },
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{ .name = "name_to_handle_at", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_FDAT, /* dfd */ }, },
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{ .name = "newfstatat", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_FDAT, /* dfd */ }, },
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{ .name = "open", .errmsg = true,
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.arg_scnprintf = { [1] = SCA_OPEN_FLAGS, /* flags */ }, },
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{ .name = "open_by_handle_at", .errmsg = true,
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.arg_scnprintf = { [2] = SCA_OPEN_FLAGS, /* flags */ }, },
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.arg_scnprintf = { [0] = SCA_FDAT, /* dfd */
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[2] = SCA_OPEN_FLAGS, /* flags */ }, },
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{ .name = "openat", .errmsg = true,
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.arg_scnprintf = { [2] = SCA_OPEN_FLAGS, /* flags */ }, },
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.arg_scnprintf = { [0] = SCA_FDAT, /* dfd */
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[2] = SCA_OPEN_FLAGS, /* flags */ }, },
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{ .name = "pipe2", .errmsg = true,
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.arg_scnprintf = { [1] = SCA_PIPE_FLAGS, /* flags */ }, },
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{ .name = "poll", .errmsg = true, .timeout = true, },
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{ .name = "ppoll", .errmsg = true, .timeout = true, },
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{ .name = "pread", .errmsg = true, .alias = "pread64", },
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{ .name = "pread", .errmsg = true, .alias = "pread64",
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.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
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{ .name = "preadv", .errmsg = true, .alias = "pread",
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.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
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{ .name = "prlimit64", .errmsg = true, STRARRAY(1, resource, rlimit_resources), },
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{ .name = "pwrite", .errmsg = true, .alias = "pwrite64", },
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{ .name = "read", .errmsg = true, },
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{ .name = "pwrite", .errmsg = true, .alias = "pwrite64",
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.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
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{ .name = "pwritev", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
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{ .name = "read", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
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{ .name = "readlinkat", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_FDAT, /* dfd */ }, },
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{ .name = "readv", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
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{ .name = "recvfrom", .errmsg = true,
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.arg_scnprintf = { [3] = SCA_MSG_FLAGS, /* flags */ }, },
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{ .name = "recvmmsg", .errmsg = true,
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.arg_scnprintf = { [3] = SCA_MSG_FLAGS, /* flags */ }, },
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{ .name = "recvmsg", .errmsg = true,
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.arg_scnprintf = { [2] = SCA_MSG_FLAGS, /* flags */ }, },
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{ .name = "renameat", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_FDAT, /* dfd */ }, },
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{ .name = "rt_sigaction", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_SIGNUM, /* sig */ }, },
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{ .name = "rt_sigprocmask", .errmsg = true, STRARRAY(0, how, sighow), },
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@ -689,6 +789,8 @@ static struct syscall_fmt {
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.arg_scnprintf = { [3] = SCA_MSG_FLAGS, /* flags */ }, },
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{ .name = "setitimer", .errmsg = true, STRARRAY(0, which, itimers), },
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{ .name = "setrlimit", .errmsg = true, STRARRAY(0, resource, rlimit_resources), },
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{ .name = "shutdown", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
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{ .name = "socket", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_STRARRAY, /* family */
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[1] = SCA_SK_TYPE, /* type */ },
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@ -698,11 +800,21 @@ static struct syscall_fmt {
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[1] = SCA_SK_TYPE, /* type */ },
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.arg_parm = { [0] = &strarray__socket_families, /* family */ }, },
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{ .name = "stat", .errmsg = true, .alias = "newstat", },
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{ .name = "symlinkat", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_FDAT, /* dfd */ }, },
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{ .name = "tgkill", .errmsg = true,
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.arg_scnprintf = { [2] = SCA_SIGNUM, /* sig */ }, },
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{ .name = "tkill", .errmsg = true,
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.arg_scnprintf = { [1] = SCA_SIGNUM, /* sig */ }, },
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{ .name = "uname", .errmsg = true, .alias = "newuname", },
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{ .name = "unlinkat", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_FDAT, /* dfd */ }, },
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{ .name = "utimensat", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_FDAT, /* dirfd */ }, },
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{ .name = "write", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
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{ .name = "writev", .errmsg = true,
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.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
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};
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static int syscall_fmt__cmp(const void *name, const void *fmtp)
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@ -747,11 +859,20 @@ struct thread_trace {
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unsigned long nr_events;
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char *entry_str;
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double runtime_ms;
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struct {
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int max;
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char **table;
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} paths;
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};
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static struct thread_trace *thread_trace__new(void)
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{
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return zalloc(sizeof(struct thread_trace));
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struct thread_trace *ttrace = zalloc(sizeof(struct thread_trace));
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if (ttrace)
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ttrace->paths.max = -1;
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return ttrace;
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}
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static struct thread_trace *thread__trace(struct thread *thread, FILE *fp)
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@ -792,6 +913,7 @@ struct trace {
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unsigned long nr_events;
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struct strlist *ev_qualifier;
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bool not_ev_qualifier;
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bool live;
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struct intlist *tid_list;
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struct intlist *pid_list;
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bool sched;
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@ -801,6 +923,98 @@ struct trace {
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double runtime_ms;
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};
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static int thread__read_fd_path(struct thread *thread, int fd)
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{
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struct thread_trace *ttrace = thread->priv;
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char linkname[PATH_MAX], pathname[PATH_MAX];
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struct stat st;
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int ret;
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if (thread->pid_ == thread->tid) {
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scnprintf(linkname, sizeof(linkname),
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"/proc/%d/fd/%d", thread->pid_, fd);
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} else {
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scnprintf(linkname, sizeof(linkname),
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"/proc/%d/task/%d/fd/%d", thread->pid_, thread->tid, fd);
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}
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if (lstat(linkname, &st) < 0 || st.st_size + 1 > (off_t)sizeof(pathname))
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return -1;
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ret = readlink(linkname, pathname, sizeof(pathname));
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if (ret < 0 || ret > st.st_size)
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return -1;
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pathname[ret] = '\0';
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if (fd > ttrace->paths.max) {
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char **npath = realloc(ttrace->paths.table, (fd + 1) * sizeof(char *));
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if (npath == NULL)
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return -1;
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if (ttrace->paths.max != -1) {
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memset(npath + ttrace->paths.max + 1, 0,
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(fd - ttrace->paths.max) * sizeof(char *));
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} else {
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memset(npath, 0, (fd + 1) * sizeof(char *));
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}
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ttrace->paths.table = npath;
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ttrace->paths.max = fd;
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}
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ttrace->paths.table[fd] = strdup(pathname);
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return ttrace->paths.table[fd] != NULL ? 0 : -1;
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}
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static const char *thread__fd_path(struct thread *thread, int fd, bool live)
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{
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struct thread_trace *ttrace = thread->priv;
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if (ttrace == NULL)
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return NULL;
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if (fd < 0)
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return NULL;
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if ((fd > ttrace->paths.max || ttrace->paths.table[fd] == NULL) &&
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(!live || thread__read_fd_path(thread, fd)))
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return NULL;
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return ttrace->paths.table[fd];
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}
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static size_t syscall_arg__scnprintf_fd(char *bf, size_t size,
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struct syscall_arg *arg)
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{
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int fd = arg->val;
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size_t printed = scnprintf(bf, size, "%d", fd);
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const char *path = thread__fd_path(arg->thread, fd, arg->trace->live);
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if (path)
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printed += scnprintf(bf + printed, size - printed, "<%s>", path);
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return printed;
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}
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static size_t syscall_arg__scnprintf_close_fd(char *bf, size_t size,
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struct syscall_arg *arg)
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{
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int fd = arg->val;
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size_t printed = syscall_arg__scnprintf_fd(bf, size, arg);
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struct thread_trace *ttrace = arg->thread->priv;
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if (ttrace && fd >= 0 && fd <= ttrace->paths.max) {
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free(ttrace->paths.table[fd]);
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ttrace->paths.table[fd] = NULL;
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}
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return printed;
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}
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static bool trace__filter_duration(struct trace *trace, double t)
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{
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return t < (trace->duration_filter * NSEC_PER_MSEC);
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@ -969,7 +1183,8 @@ static int trace__read_syscall_info(struct trace *trace, int id)
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}
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static size_t syscall__scnprintf_args(struct syscall *sc, char *bf, size_t size,
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unsigned long *args)
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unsigned long *args, struct trace *trace,
|
||||
struct thread *thread)
|
||||
{
|
||||
size_t printed = 0;
|
||||
|
||||
@ -977,8 +1192,10 @@ static size_t syscall__scnprintf_args(struct syscall *sc, char *bf, size_t size,
|
||||
struct format_field *field;
|
||||
u8 bit = 1;
|
||||
struct syscall_arg arg = {
|
||||
.idx = 0,
|
||||
.mask = 0,
|
||||
.idx = 0,
|
||||
.mask = 0,
|
||||
.trace = trace,
|
||||
.thread = thread,
|
||||
};
|
||||
|
||||
for (field = sc->tp_format->format.fields->next; field;
|
||||
@ -1111,7 +1328,8 @@ static int trace__sys_enter(struct trace *trace, struct perf_evsel *evsel,
|
||||
msg = ttrace->entry_str;
|
||||
printed += scnprintf(msg + printed, 1024 - printed, "%s(", sc->name);
|
||||
|
||||
printed += syscall__scnprintf_args(sc, msg + printed, 1024 - printed, args);
|
||||
printed += syscall__scnprintf_args(sc, msg + printed, 1024 - printed,
|
||||
args, trace, thread);
|
||||
|
||||
if (!strcmp(sc->name, "exit_group") || !strcmp(sc->name, "exit")) {
|
||||
if (!trace->duration_filter) {
|
||||
@ -1292,6 +1510,8 @@ static int trace__run(struct trace *trace, int argc, const char **argv)
|
||||
unsigned long before;
|
||||
const bool forks = argc > 0;
|
||||
|
||||
trace->live = true;
|
||||
|
||||
if (evlist == NULL) {
|
||||
fprintf(trace->output, "Not enough memory to run!\n");
|
||||
goto out;
|
||||
@ -1423,6 +1643,7 @@ out_delete_maps:
|
||||
out_delete_evlist:
|
||||
perf_evlist__delete(evlist);
|
||||
out:
|
||||
trace->live = false;
|
||||
return err;
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user