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94c7eb54c4
There has been some heat around prandom_u32() lately, and some people
were wondering if there was a simple way to determine how often
it was used, before considering making it maybe 10 times more expensive.
This tracepoint exports the generated pseudo random value.
Tested:
perf list | grep prandom_u32
random:prandom_u32 [Tracepoint event]
perf record -a [-g] [-C1] -e random:prandom_u32 sleep 1
[ perf record: Woken up 0 times to write data ]
[ perf record: Captured and wrote 259.748 MB perf.data (924087 samples) ]
perf report --nochildren
...
97.67% ksoftirqd/1 [kernel.vmlinux] [k] prandom_u32
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---prandom_u32
prandom_u32
|
|--48.86%--tcp_v4_syn_recv_sock
| tcp_check_req
| tcp_v4_rcv
| ...
--48.81%--tcp_conn_request
tcp_v4_conn_request
tcp_rcv_state_process
...
perf script
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Willy Tarreau <w@1wt.eu>
Cc: Sedat Dilek <sedat.dilek@gmail.com>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
331 lines
7.3 KiB
C
331 lines
7.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM random
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#if !defined(_TRACE_RANDOM_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_RANDOM_H
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#include <linux/writeback.h>
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#include <linux/tracepoint.h>
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TRACE_EVENT(add_device_randomness,
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TP_PROTO(int bytes, unsigned long IP),
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TP_ARGS(bytes, IP),
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TP_STRUCT__entry(
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__field( int, bytes )
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__field(unsigned long, IP )
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),
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TP_fast_assign(
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__entry->bytes = bytes;
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__entry->IP = IP;
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),
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TP_printk("bytes %d caller %pS",
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__entry->bytes, (void *)__entry->IP)
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);
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DECLARE_EVENT_CLASS(random__mix_pool_bytes,
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TP_PROTO(const char *pool_name, int bytes, unsigned long IP),
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TP_ARGS(pool_name, bytes, IP),
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TP_STRUCT__entry(
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__field( const char *, pool_name )
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__field( int, bytes )
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__field(unsigned long, IP )
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),
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TP_fast_assign(
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__entry->pool_name = pool_name;
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__entry->bytes = bytes;
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__entry->IP = IP;
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),
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TP_printk("%s pool: bytes %d caller %pS",
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__entry->pool_name, __entry->bytes, (void *)__entry->IP)
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);
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DEFINE_EVENT(random__mix_pool_bytes, mix_pool_bytes,
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TP_PROTO(const char *pool_name, int bytes, unsigned long IP),
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TP_ARGS(pool_name, bytes, IP)
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);
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DEFINE_EVENT(random__mix_pool_bytes, mix_pool_bytes_nolock,
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TP_PROTO(const char *pool_name, int bytes, unsigned long IP),
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TP_ARGS(pool_name, bytes, IP)
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);
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TRACE_EVENT(credit_entropy_bits,
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TP_PROTO(const char *pool_name, int bits, int entropy_count,
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unsigned long IP),
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TP_ARGS(pool_name, bits, entropy_count, IP),
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TP_STRUCT__entry(
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__field( const char *, pool_name )
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__field( int, bits )
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__field( int, entropy_count )
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__field(unsigned long, IP )
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),
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TP_fast_assign(
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__entry->pool_name = pool_name;
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__entry->bits = bits;
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__entry->entropy_count = entropy_count;
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__entry->IP = IP;
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),
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TP_printk("%s pool: bits %d entropy_count %d caller %pS",
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__entry->pool_name, __entry->bits,
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__entry->entropy_count, (void *)__entry->IP)
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);
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TRACE_EVENT(push_to_pool,
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TP_PROTO(const char *pool_name, int pool_bits, int input_bits),
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TP_ARGS(pool_name, pool_bits, input_bits),
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TP_STRUCT__entry(
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__field( const char *, pool_name )
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__field( int, pool_bits )
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__field( int, input_bits )
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),
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TP_fast_assign(
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__entry->pool_name = pool_name;
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__entry->pool_bits = pool_bits;
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__entry->input_bits = input_bits;
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),
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TP_printk("%s: pool_bits %d input_pool_bits %d",
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__entry->pool_name, __entry->pool_bits,
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__entry->input_bits)
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);
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TRACE_EVENT(debit_entropy,
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TP_PROTO(const char *pool_name, int debit_bits),
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TP_ARGS(pool_name, debit_bits),
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TP_STRUCT__entry(
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__field( const char *, pool_name )
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__field( int, debit_bits )
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),
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TP_fast_assign(
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__entry->pool_name = pool_name;
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__entry->debit_bits = debit_bits;
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),
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TP_printk("%s: debit_bits %d", __entry->pool_name,
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__entry->debit_bits)
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);
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TRACE_EVENT(add_input_randomness,
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TP_PROTO(int input_bits),
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TP_ARGS(input_bits),
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TP_STRUCT__entry(
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__field( int, input_bits )
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),
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TP_fast_assign(
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__entry->input_bits = input_bits;
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),
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TP_printk("input_pool_bits %d", __entry->input_bits)
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);
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TRACE_EVENT(add_disk_randomness,
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TP_PROTO(dev_t dev, int input_bits),
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TP_ARGS(dev, input_bits),
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TP_STRUCT__entry(
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__field( dev_t, dev )
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__field( int, input_bits )
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),
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TP_fast_assign(
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__entry->dev = dev;
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__entry->input_bits = input_bits;
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),
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TP_printk("dev %d,%d input_pool_bits %d", MAJOR(__entry->dev),
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MINOR(__entry->dev), __entry->input_bits)
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);
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TRACE_EVENT(xfer_secondary_pool,
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TP_PROTO(const char *pool_name, int xfer_bits, int request_bits,
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int pool_entropy, int input_entropy),
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TP_ARGS(pool_name, xfer_bits, request_bits, pool_entropy,
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input_entropy),
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TP_STRUCT__entry(
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__field( const char *, pool_name )
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__field( int, xfer_bits )
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__field( int, request_bits )
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__field( int, pool_entropy )
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__field( int, input_entropy )
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),
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TP_fast_assign(
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__entry->pool_name = pool_name;
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__entry->xfer_bits = xfer_bits;
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__entry->request_bits = request_bits;
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__entry->pool_entropy = pool_entropy;
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__entry->input_entropy = input_entropy;
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),
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TP_printk("pool %s xfer_bits %d request_bits %d pool_entropy %d "
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"input_entropy %d", __entry->pool_name, __entry->xfer_bits,
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__entry->request_bits, __entry->pool_entropy,
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__entry->input_entropy)
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);
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DECLARE_EVENT_CLASS(random__get_random_bytes,
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TP_PROTO(int nbytes, unsigned long IP),
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TP_ARGS(nbytes, IP),
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TP_STRUCT__entry(
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__field( int, nbytes )
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__field(unsigned long, IP )
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),
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TP_fast_assign(
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__entry->nbytes = nbytes;
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__entry->IP = IP;
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),
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TP_printk("nbytes %d caller %pS", __entry->nbytes, (void *)__entry->IP)
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);
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DEFINE_EVENT(random__get_random_bytes, get_random_bytes,
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TP_PROTO(int nbytes, unsigned long IP),
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TP_ARGS(nbytes, IP)
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);
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DEFINE_EVENT(random__get_random_bytes, get_random_bytes_arch,
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TP_PROTO(int nbytes, unsigned long IP),
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TP_ARGS(nbytes, IP)
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);
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DECLARE_EVENT_CLASS(random__extract_entropy,
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TP_PROTO(const char *pool_name, int nbytes, int entropy_count,
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unsigned long IP),
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TP_ARGS(pool_name, nbytes, entropy_count, IP),
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TP_STRUCT__entry(
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__field( const char *, pool_name )
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__field( int, nbytes )
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__field( int, entropy_count )
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__field(unsigned long, IP )
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),
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TP_fast_assign(
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__entry->pool_name = pool_name;
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__entry->nbytes = nbytes;
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__entry->entropy_count = entropy_count;
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__entry->IP = IP;
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),
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TP_printk("%s pool: nbytes %d entropy_count %d caller %pS",
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__entry->pool_name, __entry->nbytes, __entry->entropy_count,
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(void *)__entry->IP)
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);
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DEFINE_EVENT(random__extract_entropy, extract_entropy,
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TP_PROTO(const char *pool_name, int nbytes, int entropy_count,
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unsigned long IP),
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TP_ARGS(pool_name, nbytes, entropy_count, IP)
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);
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DEFINE_EVENT(random__extract_entropy, extract_entropy_user,
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TP_PROTO(const char *pool_name, int nbytes, int entropy_count,
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unsigned long IP),
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TP_ARGS(pool_name, nbytes, entropy_count, IP)
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);
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TRACE_EVENT(random_read,
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TP_PROTO(int got_bits, int need_bits, int pool_left, int input_left),
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TP_ARGS(got_bits, need_bits, pool_left, input_left),
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TP_STRUCT__entry(
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__field( int, got_bits )
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__field( int, need_bits )
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__field( int, pool_left )
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__field( int, input_left )
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),
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TP_fast_assign(
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__entry->got_bits = got_bits;
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__entry->need_bits = need_bits;
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__entry->pool_left = pool_left;
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__entry->input_left = input_left;
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),
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TP_printk("got_bits %d still_needed_bits %d "
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"blocking_pool_entropy_left %d input_entropy_left %d",
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__entry->got_bits, __entry->got_bits, __entry->pool_left,
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__entry->input_left)
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);
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TRACE_EVENT(urandom_read,
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TP_PROTO(int got_bits, int pool_left, int input_left),
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TP_ARGS(got_bits, pool_left, input_left),
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TP_STRUCT__entry(
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__field( int, got_bits )
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__field( int, pool_left )
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__field( int, input_left )
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),
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TP_fast_assign(
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__entry->got_bits = got_bits;
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__entry->pool_left = pool_left;
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__entry->input_left = input_left;
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),
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TP_printk("got_bits %d nonblocking_pool_entropy_left %d "
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"input_entropy_left %d", __entry->got_bits,
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__entry->pool_left, __entry->input_left)
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);
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TRACE_EVENT(prandom_u32,
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TP_PROTO(unsigned int ret),
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TP_ARGS(ret),
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TP_STRUCT__entry(
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__field( unsigned int, ret)
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),
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TP_fast_assign(
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__entry->ret = ret;
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),
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TP_printk("ret=%u" , __entry->ret)
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);
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#endif /* _TRACE_RANDOM_H */
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/* This part must be outside protection */
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#include <trace/define_trace.h>
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