Function sysctl_kern_malloc_stats

freebsd/kern/kern_malloc.c:1289–1349

}

static int
sysctl_kern_malloc_stats(SYSCTL_HANDLER_ARGS)
{
	struct malloc_type_stream_header mtsh;
	struct malloc_type_internal *mtip;
	struct malloc_type_stats *mtsp, zeromts;
	struct malloc_type_header mth;
	struct malloc_type *mtp;
	int error, i;
	struct sbuf sbuf;

	error = sysctl_wire_old_buffer(req, 0);
	if (error != 0)
		return (error);
	sbuf_new_for_sysctl(&sbuf, NULL, 128, req);
	sbuf_clear_flags(&sbuf, SBUF_INCLUDENUL);
	mtx_lock(&malloc_mtx);

	bzero(&zeromts, sizeof(zeromts));

	/*
	 * Insert stream header.
	 */
	bzero(&mtsh, sizeof(mtsh));
	mtsh.mtsh_version = MALLOC_TYPE_STREAM_VERSION;
	mtsh.mtsh_maxcpus = MAXCPU;
	mtsh.mtsh_count = kmemcount;
	(void)sbuf_bcat(&sbuf, &mtsh, sizeof(mtsh));

	/*
	 * Insert alternating sequence of type headers and type statistics.
	 */
	for (mtp = kmemstatistics; mtp != NULL; mtp = mtp->ks_next) {
		mtip = &mtp->ks_mti;

		/*
		 * Insert type header.
		 */
		bzero(&mth, sizeof(mth));
		strlcpy(mth.mth_name, mtp->ks_shortdesc, MALLOC_MAX_NAME);
		(void)sbuf_bcat(&sbuf, &mth, sizeof(mth));

		/*
		 * Insert type statistics for each CPU.
		 */
		for (i = 0; i <= mp_maxid; i++) {
			mtsp = zpcpu_get_cpu(mtip->mti_stats, i);
			(void)sbuf_bcat(&sbuf, mtsp, sizeof(*mtsp));
		}
		/*
		 * Fill in the missing CPUs.
		 */
		for (; i < MAXCPU; i++) {
			(void)sbuf_bcat(&sbuf, &zeromts, sizeof(zeromts));
		}
	}
	mtx_unlock(&malloc_mtx);
	error = sbuf_finish(&sbuf);