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    Subject[RFC PATCH 29/30 v3] make varaible size buffers for traces
    Each trace now can have the size of its trace entries modified
    through command line arguments.

    trace_fn_entries - function trace entries (default 65536)
    trace_irq_entries - irq off trace entries (default 512)
    trace_ctx_entries - schedule switch entries (default 16384)

    Signed-off-by: Steven Rostedt <srostedt@redhat.com>
    ---
    lib/tracing/trace_function.c | 14 ++++++++++++--
    lib/tracing/trace_irqsoff.c | 14 ++++++++++++--
    lib/tracing/trace_sched_switch.c | 14 ++++++++++++--
    lib/tracing/tracer.h | 1 -
    4 files changed, 36 insertions(+), 7 deletions(-)

    Index: linux-compile.git/lib/tracing/trace_function.c
    ===================================================================
    --- linux-compile.git.orig/lib/tracing/trace_function.c 2008-01-15 15:13:59.000000000 -0500
    +++ linux-compile.git/lib/tracing/trace_function.c 2008-01-15 15:15:00.000000000 -0500
    @@ -18,6 +18,16 @@
    static struct tracing_trace function_trace __read_mostly;
    static DEFINE_PER_CPU(struct tracing_trace_cpu, function_trace_cpu);
    static int trace_enabled __read_mostly;
    +static unsigned long trace_nr_entries = (65536UL);
    +
    +static int __init set_nr_entries(char *str)
    +{
    + if (!str)
    + return 0;
    + trace_nr_entries = simple_strtoul(str, &str, 0);
    + return 1;
    +}
    +__setup("trace_fn_entries=", set_nr_entries);

    static notrace void function_trace_reset(struct tracing_trace *tr)
    {
    @@ -132,7 +142,7 @@ static void function_trace_close(struct

    __init static int function_trace_alloc_buffers(void)
    {
    - const int order = page_order(TRACING_NR_ENTRIES * TRACING_ENTRY_SIZE);
    + const int order = page_order(trace_nr_entries * TRACING_ENTRY_SIZE);
    const unsigned long size = (1UL << order) << PAGE_SHIFT;
    struct tracing_entry *array;
    int i;
    @@ -156,7 +166,7 @@ __init static int function_trace_alloc_b
    function_trace.entries = size / TRACING_ENTRY_SIZE;

    pr_info("function tracer: %ld bytes allocated for %ld",
    - size, TRACING_NR_ENTRIES);
    + size, trace_nr_entries);
    pr_info(" entries of %ld bytes\n", (long)TRACING_ENTRY_SIZE);
    pr_info(" actual entries %ld\n", function_trace.entries);

    Index: linux-compile.git/lib/tracing/trace_irqsoff.c
    ===================================================================
    --- linux-compile.git.orig/lib/tracing/trace_irqsoff.c 2008-01-15 15:13:59.000000000 -0500
    +++ linux-compile.git/lib/tracing/trace_irqsoff.c 2008-01-15 15:15:00.000000000 -0500
    @@ -25,6 +25,16 @@ static unsigned long preempt_max_latency
    static unsigned long preempt_thresh;
    static __cacheline_aligned_in_smp DEFINE_MUTEX(max_mutex);
    static int trace_enabled __read_mostly;
    +static unsigned long trace_nr_entries = (512UL);
    +
    +static int __init set_nr_entries(char *str)
    +{
    + if (!str)
    + return 0;
    + trace_nr_entries = simple_strtoul(str, &str, 0);
    + return 1;
    +}
    +__setup("trace_irq_entries=", set_nr_entries);

    /*
    * max trace is switched with this buffer.
    @@ -497,7 +507,7 @@ static void notrace irqsoff_trace_close(

    __init static int trace_irqsoff_alloc_buffers(void)
    {
    - const int order = page_order(TRACING_NR_ENTRIES * TRACING_ENTRY_SIZE);
    + const int order = page_order(trace_nr_entries * TRACING_ENTRY_SIZE);
    const unsigned long size = (1UL << order) << PAGE_SHIFT;
    struct tracing_entry *array;
    int i;
    @@ -535,7 +545,7 @@ __init static int trace_irqsoff_alloc_bu
    max_tr.stop = irqsoff_stop;

    pr_info("irqs off tracer: %ld bytes allocated for %ld",
    - size, TRACING_NR_ENTRIES);
    + size, trace_nr_entries);
    pr_info(" entries of %d bytes\n", (int)TRACING_ENTRY_SIZE);
    pr_info(" actual entries %ld\n", irqsoff_trace.entries);

    Index: linux-compile.git/lib/tracing/tracer.h
    ===================================================================
    --- linux-compile.git.orig/lib/tracing/tracer.h 2008-01-15 15:13:59.000000000 -0500
    +++ linux-compile.git/lib/tracing/tracer.h 2008-01-15 15:15:00.000000000 -0500
    @@ -76,7 +76,6 @@ struct tracing_iterator {
    };

    #define TRACING_ENTRY_SIZE sizeof(struct tracing_entry)
    -#define TRACING_NR_ENTRIES (65536UL)

    void notrace tracing_reset(struct tracing_trace_cpu *data);
    int tracing_open_generic(struct inode *inode, struct file *filp);
    Index: linux-compile.git/lib/tracing/trace_sched_switch.c
    ===================================================================
    --- linux-compile.git.orig/lib/tracing/trace_sched_switch.c 2008-01-15 15:13:59.000000000 -0500
    +++ linux-compile.git/lib/tracing/trace_sched_switch.c 2008-01-15 15:15:00.000000000 -0500
    @@ -18,6 +18,16 @@ static struct tracing_trace sched_switch
    static DEFINE_PER_CPU(struct tracing_trace_cpu, sched_switch_trace_cpu);

    static int trace_enabled __read_mostly;
    +static unsigned long trace_nr_entries = (16384UL);
    +
    +static int __init set_nr_entries(char *str)
    +{
    + if (!str)
    + return 0;
    + trace_nr_entries = simple_strtoul(str, &str, 0);
    + return 1;
    +}
    +__setup("trace_ctx_entries=", set_nr_entries);

    static notrace void sched_switch_callback(const struct marker *mdata,
    void *private_data,
    @@ -144,7 +154,7 @@ static void sched_switch_trace_close(str

    __init static int sched_switch_trace_alloc_buffers(void)
    {
    - const int order = page_order(TRACING_NR_ENTRIES * TRACING_ENTRY_SIZE);
    + const int order = page_order(trace_nr_entries * TRACING_ENTRY_SIZE);
    const unsigned long size = (1UL << order) << PAGE_SHIFT;
    struct tracing_entry *array;
    int ret;
    @@ -170,7 +180,7 @@ __init static int sched_switch_trace_all
    sched_switch_trace.entries = size / TRACING_ENTRY_SIZE;

    pr_info("sched_switch tracer: %ld bytes allocated for %ld",
    - size, TRACING_NR_ENTRIES);
    + size, trace_nr_entries);
    pr_info(" entries of %ld bytes\n", (long)TRACING_ENTRY_SIZE);
    pr_info(" actual entries %ld\n", sched_switch_trace.entries);

    --


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