diff options
| -rw-r--r-- | ChangeLog | 9 | ||||
| -rw-r--r-- | malloc/arena.c | 1 | ||||
| -rw-r--r-- | malloc/malloc.c | 4 | ||||
| -rw-r--r-- | manual/Makefile | 2 | ||||
| -rw-r--r-- | manual/probes.texi | 41 | ||||
| -rw-r--r-- | manual/threads.texi | 2 |
6 files changed, 57 insertions, 2 deletions
@@ -1,3 +1,12 @@ +2013-09-20 Alexandre Oliva <aoliva@redhat.com> + + * malloc/malloc.c: Include stap-probe.h. + (__libc_mallopt): Add memory_mallopt probe. + * malloc/arena.c (_int_new_arena): Add memory_arena_new probe. + * manual/probes.texi: New. + * manual/Makefile (chapters): Add probes. + * manual/threads.texi: Set next node. + 2013-09-19 Wei-Lun Chao <bluebat@member.fsf.org> [BZ #15963, #13985] diff --git a/malloc/arena.c b/malloc/arena.c index 12a48ad7ba..0822fc85d5 100644 --- a/malloc/arena.c +++ b/malloc/arena.c @@ -736,6 +736,7 @@ _int_new_arena(size_t size) top(a) = (mchunkptr)ptr; set_head(top(a), (((char*)h + h->size) - ptr) | PREV_INUSE); + LIBC_PROBE (memory_arena_new, 2, a, size); tsd_setspecific(arena_key, (void *)a); mutex_init(&a->mutex); (void)mutex_lock(&a->mutex); diff --git a/malloc/malloc.c b/malloc/malloc.c index f7718a9c9a..97ba34f995 100644 --- a/malloc/malloc.c +++ b/malloc/malloc.c @@ -1878,6 +1878,8 @@ static int perturb_byte; #define free_perturb(p, n) memset (p, perturb_byte & 0xff, n) +#include <stap-probe.h> + /* ------------------- Support for multiple arenas -------------------- */ #include "arena.c" @@ -4695,6 +4697,8 @@ int __libc_mallopt(int param_number, int value) /* Ensure initialization/consolidation */ malloc_consolidate(av); + LIBC_PROBE (memory_mallopt, 2, param_number, value); + switch(param_number) { case M_MXFAST: if (value >= 0 && value <= MAX_FAST_SIZE) { diff --git a/manual/Makefile b/manual/Makefile index 44c0fd4f68..7bb419aea4 100644 --- a/manual/Makefile +++ b/manual/Makefile @@ -42,7 +42,7 @@ chapters = $(addsuffix .texi, \ message search pattern io stdio llio filesys \ pipe socket terminal syslog math arith time \ resource setjmp signal startup process job nss \ - users sysinfo conf crypt debug threads) + users sysinfo conf crypt debug threads probes) add-chapters = $(wildcard $(foreach d, $(add-ons), ../$d/$d.texi)) appendices = lang.texi header.texi install.texi maint.texi platform.texi \ contrib.texi diff --git a/manual/probes.texi b/manual/probes.texi new file mode 100644 index 0000000000..fc02ffddc9 --- /dev/null +++ b/manual/probes.texi @@ -0,0 +1,41 @@ +@node Internal Probes +@c @node Internal Probes, , POSIX Threads, Top +@c %MENU% Probes to monitor libc internal behavior +@chapter Internal probes + +In order to aid in debugging and monitoring internal behavior, +@theglibc{} exposes nearly-zero-overhead SystemTap probes marked with +the @code{libc} provider. + +These probes are not part of the @glibcadj{} stable ABI, and they are +subject to change or removal across releases. Our only promise with +regard to them is that, if we find a need to remove or modify the +arguments of a probe, the modified probe will have a different name, so +that program monitors relying on the old probe will not get unexpected +arguments. + +@menu +* Memory Allocation Probes:: Probes in the memory allocation subsystem +@end menu + +@node Memory Allocation Probes +@section Memory Allocation Probes + +These probes are designed to signal relatively unusual situations within +the virtual memory subsystem of @theglibc{}. + +@deftp Probe memory_arena_new (void *@var{$arg1}, size_t @var{$arg2}) +This probe is triggered when @code{malloc} allocates and initializes an +additional arena (not the main arena), but before the arena is assigned +to the running thread or inserted into the internal linked list of +arenas. The arena's @code{malloc_state} internal data structure is +located at @var{$arg1}, within a newly-allocated heap big enough to hold +at least @var{$arg2} bytes. +@end deftp + +@deftp Probe memory_mallopt (int @var{$arg1}, int @var{$arg2}) +This probe is triggered when function @code{mallopt} is called to change +@code{malloc} internal configuration parameters, before any change to +the parameters is made. The arguments @var{$arg1} and @var{$arg2} are +the ones passed to the @code{mallopt} function. +@end deftp diff --git a/manual/threads.texi b/manual/threads.texi index a23ac261ef..6b7523c525 100644 --- a/manual/threads.texi +++ b/manual/threads.texi @@ -1,5 +1,5 @@ @node POSIX Threads -@c @node POSIX Threads, , Cryptographic Functions, Top +@c @node POSIX Threads, Intenal Probes, Cryptographic Functions, Top @chapter POSIX Threads @c %MENU% POSIX Threads @cindex pthreads |