Usando SystemTap com Sensores Estáticos DTrace

Em algumas distribuições Linux, o utilitário SystemTap de instrumentação pode ser usado para instrumentar sensores estáticos do PHP. Isso está disponível no PHP 5.4.20 e PHP 5.5.

Instalando PHP com SystemTap

Instale o pacote de desenvolvimento do SystemTap, SDT:

# yum install systemtap-sdt-devel

Instale o PHP com os sensores DTrace habilitados:

# ./configure --enable-dtrace ...
# make

Listando os Sensores Estáticos com SystemTap

Os sensores estáticos em PHP podem ser listados usando stap:

# stap -l 'process.provider("php").mark("*")' -c 'sapi/cli/php -i'

A saída será:

process("sapi/cli/php").provider("php").mark("compile__file__entry")
process("sapi/cli/php").provider("php").mark("compile__file__return")
process("sapi/cli/php").provider("php").mark("error")
process("sapi/cli/php").provider("php").mark("exception__caught")
process("sapi/cli/php").provider("php").mark("exception__thrown")
process("sapi/cli/php").provider("php").mark("execute__entry")
process("sapi/cli/php").provider("php").mark("execute__return")
process("sapi/cli/php").provider("php").mark("function__entry")
process("sapi/cli/php").provider("php").mark("function__return")
process("sapi/cli/php").provider("php").mark("request__shutdown")
process("sapi/cli/php").provider("php").mark("request__startup")

Exemplo de SystemTap com PHP

Exemplo #1 all_probes.stp para instrumentação de todos os Sensores Estáticos do PHP com SystemTap

probe process("sapi/cli/php").provider("php").mark("compile__file__entry") {
    printf("Probe compile__file__entry\n");
    printf("  compile_file %s\n", user_string($arg1));
    printf("  compile_file_translated %s\n", user_string($arg2));
}
probe process("sapi/cli/php").provider("php").mark("compile__file__return") {
    printf("Probe compile__file__return\n");
    printf("  compile_file %s\n", user_string($arg1));
    printf("  compile_file_translated %s\n", user_string($arg2));
}
probe process("sapi/cli/php").provider("php").mark("error") {
    printf("Probe error\n");
    printf("  errormsg %s\n", user_string($arg1));
    printf("  request_file %s\n", user_string($arg2));
    printf("  lineno %d\n", $arg3);
}
probe process("sapi/cli/php").provider("php").mark("exception__caught") {
    printf("Probe exception__caught\n");
    printf("  classname %s\n", user_string($arg1));
}
probe process("sapi/cli/php").provider("php").mark("exception__thrown") {
    printf("Probe exception__thrown\n");
    printf("  classname %s\n", user_string($arg1));
}
probe process("sapi/cli/php").provider("php").mark("execute__entry") {
    printf("Probe execute__entry\n");
    printf("  request_file %s\n", user_string($arg1));
    printf("  lineno %d\n", $arg2);
}
probe process("sapi/cli/php").provider("php").mark("execute__return") {
    printf("Probe execute__return\n");
    printf("  request_file %s\n", user_string($arg1));
    printf("  lineno %d\n", $arg2);
}
probe process("sapi/cli/php").provider("php").mark("function__entry") {
    printf("Probe function__entry\n");
    printf("  function_name %s\n", user_string($arg1));
    printf("  request_file %s\n", user_string($arg2));
    printf("  lineno %d\n", $arg3);
    printf("  classname %s\n", user_string($arg4));
    printf("  scope %s\n", user_string($arg5));
}
probe process("sapi/cli/php").provider("php").mark("function__return") {
    printf("Probe function__return: %s\n", user_string($arg1));
    printf(" function_name %s\n", user_string($arg1));
    printf("  request_file %s\n", user_string($arg2));
    printf("  lineno %d\n", $arg3);
    printf("  classname %s\n", user_string($arg4));
    printf("  scope %s\n", user_string($arg5));
}
probe process("sapi/cli/php").provider("php").mark("request__shutdown") {
    printf("Probe request__shutdown\n");
    printf("  file %s\n", user_string($arg1));
    printf("  request_uri %s\n", user_string($arg2));
    printf("  request_method %s\n", user_string($arg3));
}
probe process("sapi/cli/php").provider("php").mark("request__startup") {
    printf("Probe request__startup\n");
    printf("  file %s\n", user_string($arg1));
    printf("  request_uri %s\n", user_string($arg2));
    printf("  request_method %s\n", user_string($arg3));
}

O script acima irá instrumentar todos os pontos de sensores estáticos do núcleo do PHP durante toda a duração de um script PHP em execução:

# stap -c 'sapi/cli/php test.php' all_probes.stp

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User Contributed Notes 1 note

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idealities at gmail dot com
6 years ago
# stap -l 'process.provider("php").mark("*")' -c 'sapi/cli/php -i'

This can also be archived by:

stap -l 'process("sapi/cli/php").mark("*")'

And, no need to be root to run this command.
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