Add a "show malloc" command to DDB, which prints out the current stats for
available kernel malloc types. Quite useful for post-mortem debugging of memory leaks without a dump device configured on a panicked box. MFC after: 2 weeks
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=151519
@ -34,6 +34,7 @@
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_ddb.h"
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#include "opt_vm.h"
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#include <sys/param.h>
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@ -69,6 +70,8 @@ __FBSDID("$FreeBSD$");
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#include <machine/cpu.h>
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#endif
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#include <ddb/ddb.h>
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/*
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* When realloc() is called, if the new size is sufficiently smaller than
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* the old size, realloc() will allocate a new, smaller block to avoid
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@ -813,6 +816,30 @@ SYSCTL_PROC(_kern, OID_AUTO, malloc_stats, CTLFLAG_RD|CTLTYPE_STRUCT,
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SYSCTL_INT(_kern, OID_AUTO, malloc_count, CTLFLAG_RD, &kmemcount, 0,
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"Count of kernel malloc types");
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#ifdef DDB
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DB_SHOW_COMMAND(malloc, db_show_malloc)
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{
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struct malloc_type_internal *mtip;
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struct malloc_type *mtp;
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u_int64_t allocs, frees;
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int i;
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db_printf("%18s %12s %12s %12s\n", "Type", "Allocs", "Frees",
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"Used");
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for (mtp = kmemstatistics; mtp != NULL; mtp = mtp->ks_next) {
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mtip = (struct malloc_type_internal *)mtp->ks_handle;
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allocs = 0;
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frees = 0;
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for (i = 0; i < MAXCPU; i++) {
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allocs += mtip->mti_stats[i].mts_numallocs;
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frees += mtip->mti_stats[i].mts_numfrees;
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}
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db_printf("%18s %12llu %12llu %12llu\n", mtp->ks_shortdesc,
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allocs, frees, allocs - frees);
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}
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}
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#endif
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#ifdef MALLOC_PROFILE
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static int
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