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Add probes for all changes to malloc options.
for ChangeLog * malloc/malloc.c (__libc_free): Add memory_mallopt_free_dyn_thresholds probe. (__libc_mallopt): Add multiple memory_mallopt probes. * manual/probes.texi: Document them.
This commit is contained in:
Alexandre Oliva
parent
3ea5be5436
commit
0653427fdb
@ -1,5 +1,10 @@
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2013-09-20 Alexandre Oliva <aoliva@redhat.com>
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* malloc/malloc.c (__libc_free): Add
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memory_mallopt_free_dyn_thresholds probe.
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(__libc_mallopt): Add multiple memory_mallopt probes.
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* manual/probes.texi: Document them.
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* malloc/malloc.c: Include stap-probe.h.
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(__libc_mallopt): Add memory_mallopt probe.
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* malloc/arena.c (_int_new_arena): Add memory_arena_new probe.
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@ -2896,6 +2896,8 @@ __libc_free(void* mem)
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{
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mp_.mmap_threshold = chunksize (p);
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mp_.trim_threshold = 2 * mp_.mmap_threshold;
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LIBC_PROBE (memory_mallopt_free_dyn_thresholds, 2,
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mp_.mmap_threshold, mp_.trim_threshold);
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}
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munmap_chunk(p);
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return;
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@ -4701,19 +4703,25 @@ int __libc_mallopt(int param_number, int value)
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switch(param_number) {
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case M_MXFAST:
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if (value >= 0 && value <= MAX_FAST_SIZE) {
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set_max_fast(value);
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}
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if (value >= 0 && value <= MAX_FAST_SIZE)
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{
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LIBC_PROBE (memory_mallopt_mxfast, 2, value, get_max_fast ());
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set_max_fast(value);
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}
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else
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res = 0;
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break;
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case M_TRIM_THRESHOLD:
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LIBC_PROBE (memory_mallopt_trim_threshold, 3, value,
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mp_.trim_threshold, mp_.no_dyn_threshold);
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mp_.trim_threshold = value;
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mp_.no_dyn_threshold = 1;
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break;
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case M_TOP_PAD:
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LIBC_PROBE (memory_mallopt_top_pad, 3, value,
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mp_.top_pad, mp_.no_dyn_threshold);
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mp_.top_pad = value;
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mp_.no_dyn_threshold = 1;
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break;
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@ -4724,33 +4732,45 @@ int __libc_mallopt(int param_number, int value)
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res = 0;
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else
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{
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LIBC_PROBE (memory_mallopt_mmap_threshold, 3, value,
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mp_.mmap_threshold, mp_.no_dyn_threshold);
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mp_.mmap_threshold = value;
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mp_.no_dyn_threshold = 1;
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}
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break;
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case M_MMAP_MAX:
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LIBC_PROBE (memory_mallopt_mmap_max, 3, value,
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mp_.n_mmaps_max, mp_.no_dyn_threshold);
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mp_.n_mmaps_max = value;
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mp_.no_dyn_threshold = 1;
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break;
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case M_CHECK_ACTION:
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LIBC_PROBE (memory_mallopt_check_action, 2, value, check_action);
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check_action = value;
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break;
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case M_PERTURB:
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LIBC_PROBE (memory_mallopt_perturb, 2, value, perturb_byte);
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perturb_byte = value;
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break;
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#ifdef PER_THREAD
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case M_ARENA_TEST:
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if (value > 0)
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mp_.arena_test = value;
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{
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LIBC_PROBE (memory_mallopt_arena_test, 2, value, mp_.arena_test);
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mp_.arena_test = value;
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}
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break;
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case M_ARENA_MAX:
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if (value > 0)
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mp_.arena_max = value;
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{
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LIBC_PROBE (memory_mallopt_arena_max, 2, value, mp_.arena_max);
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mp_.arena_max = value;
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}
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break;
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#endif
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}
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@ -22,7 +22,9 @@ arguments.
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@section Memory Allocation Probes
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These probes are designed to signal relatively unusual situations within
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the virtual memory subsystem of @theglibc{}.
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the virtual memory subsystem of @theglibc{}. The location and the
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availability of some probes depend on whether per-thread arenas are
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enabled (the default) or disabled at the time @theglibc{} is compiled.
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@deftp Probe memory_arena_new (void *@var{$arg1}, size_t @var{$arg2})
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This probe is triggered when @code{malloc} allocates and initializes an
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@ -39,3 +41,82 @@ This probe is triggered when function @code{mallopt} is called to change
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the parameters is made. The arguments @var{$arg1} and @var{$arg2} are
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the ones passed to the @code{mallopt} function.
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@end deftp
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@deftp Probe memory_mallopt_mxfast (int @var{$arg1}, int @var{$arg2})
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This probe is triggered shortly after the @code{memory_mallopt} probe,
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when the parameter to be changed is @code{M_MXFAST}, and the requested
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value is in an acceptable range. Argument @var{$arg1} is the requested
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value, and @var{$arg2} is the previous value of this @code{malloc}
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parameter.
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@end deftp
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@deftp Probe memory_mallopt_trim_threshold (int @var{$arg1}, int @var{$arg2}, int @var{$arg3})
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This probe is triggere shortly after the @code{memory_mallopt} probe,
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when the parameter to be changed is @code{M_TRIM_THRESHOLD}. Argument
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@var{$arg1} is the requested value, @var{$arg2} is the previous value of
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this @code{malloc} parameter, and @var{$arg3} is nonzero if dynamic
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threshold adjustment was already disabled.
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@end deftp
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@deftp Probe memory_mallopt_top_pad (int @var{$arg1}, int @var{$arg2}, int @var{$arg3})
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This probe is triggered shortly after the @code{memory_mallopt} probe,
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when the parameter to be changed is @code{M_TOP_PAD}. Argument
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@var{$arg1} is the requested value, @var{$arg2} is the previous value of
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this @code{malloc} parameter, and @var{$arg3} is nonzero if dynamic
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threshold adjustment was already disabled.
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@end deftp
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@deftp Probe memory_mallopt_mmap_threshold (int @var{$arg1}, int @var{$arg2}, int @var{$arg3})
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This probe is triggered shortly after the @code{memory_mallopt} probe,
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when the parameter to be changed is @code{M_MMAP_THRESHOLD}, and the
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requested value is in an acceptable range. Argument @var{$arg1} is the
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requested value, @var{$arg2} is the previous value of this @code{malloc}
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parameter, and @var{$arg3} is nonzero if dynamic threshold adjustment
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was already disabled.
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@end deftp
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@deftp Probe memory_mallopt_mmap_max (int @var{$arg1}, int @var{$arg2}, int @var{$arg3})
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This probe is triggered shortly after the @code{memory_mallopt} probe,
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when the parameter to be changed is @code{M_MMAP_MAX}. Argument
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@var{$arg1} is the requested value, @var{$arg2} is the previous value of
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this @code{malloc} parameter, and @var{$arg3} is nonzero if dynamic
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threshold adjustment was already disabled.
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@end deftp
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@deftp Probe memory_mallopt_check_action (int @var{$arg1}, int @var{$arg2})
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This probe is triggered shortly after the @code{memory_mallopt} probe,
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when the parameter to be changed is @code{M_CHECK_ACTION}. Argument
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@var{$arg1} is the requested value, and @var{$arg2} is the previous
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value of this @code{malloc} parameter.
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@end deftp
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@deftp Probe memory_mallopt_perturb (int @var{$arg1}, int @var{$arg2})
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This probe is triggered shortly after the @code{memory_mallopt} probe,
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when the parameter to be changed is @code{M_PERTURB}. Argument
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@var{$arg1} is the requested value, and @var{$arg2} is the previous
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value of this @code{malloc} parameter.
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@end deftp
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@deftp Probe memory_mallopt_arena_test (int @var{$arg1}, int @var{$arg2})
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This probe is triggered shortly after the @code{memory_mallopt} probe,
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when the parameter to be changed is @code{M_ARENA_TEST}, and the
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requested value is in an acceptable range. Argument @var{$arg1} is the
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requested value, and @var{$arg2} is the previous value of this
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@code{malloc} parameter. This probe is only available when per-thread
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arenas are enabled.
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@end deftp
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@deftp Probe memory_mallopt_arena_max (int @var{$arg1}, int @var{$arg2})
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This probe is triggered shortly after the @code{memory_mallopt} probe,
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when the parameter to be changed is @code{M_ARENA_MAX}, and the
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requested value is in an acceptable range. Argument @var{$arg1} is the
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requested value, and @var{$arg2} is the previous value of this
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@code{malloc} parameter. This probe is only available when per-thread
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arenas are enabled.
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@end deftp
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@deftp Probe memory_mallopt_free_dyn_thresholds (int @var{$arg1}, int @var{$arg2})
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This probe is triggered when function @code{free} decides to adjust the
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dynamic brk/mmap thresholds. Argument @var{$arg1} and @var{$arg2} are
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the adjusted mmap and trim thresholds, respectively.
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@end deftp
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