core: Add some documentation to the malloc_trim code
This adds documentation to handle_cli_malloc_trim() indicating how it can be useful when debugging OOM conditions. Change-Id: I1936185e78035bf123cd5e097b793a55eeebdc78
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main/cli.c
55
main/cli.c
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@ -1790,30 +1790,43 @@ static char *handle_cli_wait_fullybooted(struct ast_cli_entry *e, int cmd, struc
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#ifdef HAVE_MALLOC_TRIM
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/* BUGBUG malloc_trim() is a libc specific function. Non-portable. */
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static char *handle_cli_malloc_trim(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
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{
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extern int malloc_trim(size_t __pad) __THROW;
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switch (cmd) {
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case CLI_INIT:
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e->command = "malloc trim";
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e->usage =
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"Usage: malloc trim\n"
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" Try to give excess memory back to the OS.\n";
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return NULL;
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case CLI_GENERATE:
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return NULL;
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}
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/*!
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* \internal
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* \brief Attempt to reclaim unused heap memory.
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*
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* Users have reported that asterisk will sometimes be killed because it can't allocate
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* more than around 3G of memory on a 32 bit system.
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*
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* Using malloc_trim() will help us to determine if it's because there's a leak or because
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* the heap is so fragmented that there isn't enough contiguous memory available.
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*
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* \note malloc_trim() is a GNU extension and is therefore not portable.
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*/
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static char *handle_cli_malloc_trim(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
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{
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extern int malloc_trim(size_t __pad) __THROW;
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if (malloc_trim(0)) {
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ast_cli(a->fd, "Returned some memory to the OS.\n");
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} else {
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ast_cli(a->fd, "No memory returned to the OS.\n");
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}
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return CLI_SUCCESS;
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switch (cmd) {
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case CLI_INIT:
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e->command = "malloc trim";
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e->usage =
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"Usage: malloc trim\n"
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" Try to give excess memory back to the OS.\n";
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return NULL;
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case CLI_GENERATE:
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return NULL;
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}
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if (malloc_trim(0)) {
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ast_cli(a->fd, "Returned some memory to the OS.\n");
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} else {
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ast_cli(a->fd, "No memory returned to the OS.\n");
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}
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return CLI_SUCCESS;
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}
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#endif
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static char *handle_help(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
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