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80ad63dc31
procps/proc/slabinfo.c
Jim Warner 80ad63dc31 library: refactor exposed pointers management, 3rd gen 
This commit brings all of those 'fetch' type functions
(supporting some form of 'reap') into closer alignment
with one another. The biggest impact is to be found in
the <stat> module, which now provides for the separate
copy of stack pointers which will be exposed to users.

The reason such a copy was not employed initially with
<stat>, unlike those for <pids> and <slabinfo>, is due
to the fact that such stacks were never sortable. Thus
the original raw consolidated extent pointers wouldn't
have been disturbed. But that meant no NULL delimiter.

So with this commit, all reap/fetch operations now use
pointer copies when returning results to callers. And,
all such arrays are now NULL delimited meaning callers
can choose their own access fencepost: totals or NULL.

Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-07-02 16:33:01 +10:00

1006 lines
34 KiB
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/*
* slabinfo.c - slabinfo related functions for libproc
*
* Chris Rivera <cmrivera@ufl.edu>
* Robert Love <rml@tech9.net>
*
* Copyright (C) 2003 Chris Rivera
* Copyright (C) 2004 Albert Cahalan
* Copyright (C) 2015 Craig Small <csmall@enc.com.au>
* Copyright (C) 2016 Jim Warnerl <james.warner@comcast.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <proc/procps-private.h>
#include <proc/slabinfo.h>
#define SLABINFO_FILE "/proc/slabinfo"
#define SLABINFO_LINE_LEN 2048
#define SLAB_INFO_NAME_LEN 128
#define STACKS_INCR 128
/*
Because 'select' could, at most, return only node[0] values and since 'reap' |
would be forced to duplicate global slabs stuff in every node results stack, |
the following #define can be used to enforce strictly logical return values. |
select: allow only PROCPS_SLABINFO & PROCPS_SLABS items
reap: allow only PROCPS_SLABINFO & PROCPS_SLABNODE items
Without the #define, these functions always return something even if just 0. |
get: return only PROCPS_SLABS results, else 0
select: return only PROCPS_SLABINFO & PROCPS_SLABS results, else zero
reap: return any requested, even when duplicated in each node's stack */
//#define ENFORCE_LOGICAL // ensure only logical items accepted by select/reap
struct slabs_summ {
unsigned int nr_objs; /* number of objects, among all caches */
unsigned int nr_active_objs; /* number of active objects, among all caches */
unsigned int nr_pages; /* number of pages consumed by all objects */
unsigned int nr_slabs; /* number of slabs, among all caches */
unsigned int nr_active_slabs; /* number of active slabs, among all caches */
unsigned int nr_caches; /* number of caches */
unsigned int nr_active_caches; /* number of active caches */
unsigned int avg_obj_size; /* average object size */
unsigned int min_obj_size; /* size of smallest object */
unsigned int max_obj_size; /* size of largest object */
unsigned long active_size; /* size of all active objects */
unsigned long total_size; /* size of all objects */
};
struct slabs_node {
char name[SLAB_INFO_NAME_LEN]; /* name of this cache */
unsigned long cache_size; /* size of entire cache */
unsigned int nr_objs; /* number of objects in this cache */
unsigned int nr_active_objs; /* number of active objects */
unsigned int obj_size; /* size of each object */
unsigned int objs_per_slab; /* number of objects per slab */
unsigned int pages_per_slab; /* number of pages per slab */
unsigned int nr_slabs; /* number of slabs in this cache */
unsigned int nr_active_slabs; /* number of active slabs */
unsigned int use; /* percent full: total / active */
};
struct slabs_hist {
struct slabs_summ new;
struct slabs_summ old;
};
struct stacks_extent {
int ext_numstacks;
struct stacks_extent *next;
struct slabinfo_stack **stacks;
};
struct ext_support {
int numitems; // includes 'logical_end' delimiter
enum slabinfo_item *items; // includes 'logical_end' delimiter
struct stacks_extent *extents; // anchor for these extents
#ifdef ENFORCE_LOGICAL
enum slabinfo_item lowest; // range of allowable enums
enum slabinfo_item highest;
#endif
int dirty_stacks;
};
struct fetch_support {
struct slabinfo_stack **anchor; // fetch consolidated extents
int n_alloc; // number of above pointers allocated
int n_inuse; // number of above pointers occupied
int n_alloc_save; // last known reap.stacks allocation
struct slabinfo_reap results; // count + stacks for return to caller
};
struct procps_slabinfo {
int refcount;
FILE *slabinfo_fp;
int slabinfo_was_read;
int nodes_alloc; /* nodes alloc()ed */
int nodes_used; /* nodes using alloced memory */
struct slabs_node *nodes; /* first slabnode of this list */
struct slabs_hist hist; /* new/old slabs_summ data */
struct ext_support select_ext; /* supports concurrent select/reap */
struct ext_support fetch_ext; /* supports concurrent select/reap */
struct fetch_support fetch; /* support for procps_slabinfo_reap */
struct slabs_node nul_node; /* used by slabinfo_get/select */
struct slabinfo_result get_this; /* used by slabinfo_get */
};
// ___ Results 'Set' Support ||||||||||||||||||||||||||||||||||||||||||||||||||
#define setNAME(e) set_results_ ## e
#define setDECL(e) static void setNAME(e) \
(struct slabinfo_result *R, struct slabs_hist *S, struct slabs_node *N)
// regular assignment
#define REG_set(e,t,x) setDECL(e) { (void)N; R->result. t = S->new . x; }
#define NOD_set(e,t,x) setDECL(e) { (void)S; R->result. t = N-> x; }
// delta assignment
#define HST_set(e,t,x) setDECL(e) { (void)N; R->result. t = (signed long)S->new . x - S->old. x; }
setDECL(noop) { (void)R; (void)S; (void)N; }
setDECL(extra) { (void)R; (void)S; (void)N; }
REG_set(SLABS_OBJS, u_int, nr_objs)
REG_set(SLABS_AOBJS, u_int, nr_active_objs)
REG_set(SLABS_PAGES, u_int, nr_pages)
REG_set(SLABS_SLABS, u_int, nr_slabs)
REG_set(SLABS_ASLABS, u_int, nr_active_slabs)
REG_set(SLABS_CACHES, u_int, nr_caches)
REG_set(SLABS_ACACHES, u_int, nr_active_caches)
REG_set(SLABS_SIZE_AVG, u_int, avg_obj_size)
REG_set(SLABS_SIZE_MIN, u_int, min_obj_size)
REG_set(SLABS_SIZE_MAX, u_int, max_obj_size)
REG_set(SLABS_SIZE_ACTIVE, ul_int, active_size)
REG_set(SLABS_SIZE_TOTAL, ul_int, total_size)
HST_set(SLABS_DELTA_OBJS, s_int, nr_objs)
HST_set(SLABS_DELTA_AOBJS, s_int, nr_active_objs)
HST_set(SLABS_DELTA_PAGES, s_int, nr_pages)
HST_set(SLABS_DELTA_SLABS, s_int, nr_slabs)
HST_set(SLABS_DELTA_ASLABS, s_int, nr_active_slabs)
HST_set(SLABS_DELTA_CACHES, s_int, nr_caches)
HST_set(SLABS_DELTA_ACACHES, s_int, nr_active_caches)
HST_set(SLABS_DELTA_SIZE_AVG, s_int, avg_obj_size)
HST_set(SLABS_DELTA_SIZE_MIN, s_int, min_obj_size)
HST_set(SLABS_DELTA_SIZE_MAX, s_int, max_obj_size)
HST_set(SLABS_DELTA_SIZE_ACTIVE, s_int, active_size)
HST_set(SLABS_DELTA_SIZE_TOTAL, s_int, total_size)
NOD_set(SLABNODE_NAME, str, name)
NOD_set(SLABNODE_OBJS, u_int, nr_objs)
NOD_set(SLABNODE_AOBJS, u_int, nr_active_objs)
NOD_set(SLABNODE_OBJ_SIZE, u_int, obj_size)
NOD_set(SLABNODE_OBJS_PER_SLAB, u_int, objs_per_slab)
NOD_set(SLABNODE_PAGES_PER_SLAB, u_int, pages_per_slab)
NOD_set(SLABNODE_SLABS, u_int, nr_slabs)
NOD_set(SLABNODE_ASLABS, u_int, nr_active_slabs)
NOD_set(SLABNODE_USE, u_int, use)
NOD_set(SLABNODE_SIZE, ul_int, cache_size)
#undef setDECL
#undef REG_set
#undef NOD_set
#undef HST_set
// ___ Sorting Support ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
struct sort_parms {
int offset;
enum slabinfo_sort_order order;
};
#define srtNAME(t) sort_results_ ## t
#define srtDECL(t) static int srtNAME(t) \
(const struct slabinfo_stack **A, const struct slabinfo_stack **B, struct sort_parms *P)
srtDECL(u_int) {
const struct slabinfo_result *a = (*A)->head + P->offset; \
const struct slabinfo_result *b = (*B)->head + P->offset; \
if ( a->result.u_int > b->result.u_int ) return P->order > 0 ? 1 : -1; \
if ( a->result.u_int < b->result.u_int ) return P->order > 0 ? -1 : 1; \
return 0;
}
srtDECL(ul_int) {
const struct slabinfo_result *a = (*A)->head + P->offset; \
const struct slabinfo_result *b = (*B)->head + P->offset; \
if ( a->result.ul_int > b->result.ul_int ) return P->order > 0 ? 1 : -1; \
if ( a->result.ul_int < b->result.ul_int ) return P->order > 0 ? -1 : 1; \
return 0;
}
srtDECL(str) {
const struct slabinfo_result *a = (*A)->head + P->offset;
const struct slabinfo_result *b = (*B)->head + P->offset;
return P->order * strcoll(a->result.str, b->result.str);
}
srtDECL(noop) { \
(void)A; (void)B; (void)P; \
return 0;
}
#undef srtDECL
// ___ Controlling Table ||||||||||||||||||||||||||||||||||||||||||||||||||||||
typedef void (*SET_t)(struct slabinfo_result *, struct slabs_hist *, struct slabs_node *);
#define RS(e) (SET_t)setNAME(e)
typedef int (*QSR_t)(const void *, const void *, void *);
#define QS(t) (QSR_t)srtNAME(t)
/*
* Need it be said?
* This table must be kept in the exact same order as
* those *enum slabinfo_item* guys ! */
static struct {
SET_t setsfunc; // the actual result setting routine
QSR_t sortfunc; // sort cmp func for a specific type
} Item_table[] = {
/* setsfunc sortfunc
--------------------------- --------- */
{ RS(noop), QS(ul_int) },
{ RS(extra), QS(noop) },
{ RS(SLABS_OBJS), QS(noop) },
{ RS(SLABS_AOBJS), QS(noop) },
{ RS(SLABS_PAGES), QS(noop) },
{ RS(SLABS_SLABS), QS(noop) },
{ RS(SLABS_ASLABS), QS(noop) },
{ RS(SLABS_CACHES), QS(noop) },
{ RS(SLABS_ACACHES), QS(noop) },
{ RS(SLABS_SIZE_AVG), QS(noop) },
{ RS(SLABS_SIZE_MIN), QS(noop) },
{ RS(SLABS_SIZE_MAX), QS(noop) },
{ RS(SLABS_SIZE_ACTIVE), QS(noop) },
{ RS(SLABS_SIZE_TOTAL), QS(noop) },
{ RS(SLABS_DELTA_OBJS), QS(noop) },
{ RS(SLABS_DELTA_AOBJS), QS(noop) },
{ RS(SLABS_DELTA_PAGES), QS(noop) },
{ RS(SLABS_DELTA_SLABS), QS(noop) },
{ RS(SLABS_DELTA_ASLABS), QS(noop) },
{ RS(SLABS_DELTA_CACHES), QS(noop) },
{ RS(SLABS_DELTA_ACACHES), QS(noop) },
{ RS(SLABS_DELTA_SIZE_AVG), QS(noop) },
{ RS(SLABS_DELTA_SIZE_MIN), QS(noop) },
{ RS(SLABS_DELTA_SIZE_MAX), QS(noop) },
{ RS(SLABS_DELTA_SIZE_ACTIVE), QS(noop) },
{ RS(SLABS_DELTA_SIZE_TOTAL), QS(noop) },
{ RS(SLABNODE_NAME), QS(str) },
{ RS(SLABNODE_OBJS), QS(u_int) },
{ RS(SLABNODE_AOBJS), QS(u_int) },
{ RS(SLABNODE_OBJ_SIZE), QS(u_int) },
{ RS(SLABNODE_OBJS_PER_SLAB), QS(u_int) },
{ RS(SLABNODE_PAGES_PER_SLAB), QS(u_int) },
{ RS(SLABNODE_SLABS), QS(u_int) },
{ RS(SLABNODE_ASLABS), QS(u_int) },
{ RS(SLABNODE_USE), QS(u_int) },
{ RS(SLABNODE_SIZE), QS(ul_int) },
// dummy entry corresponding to PROCPS_SLABINFO_logical_end ...
{ NULL, NULL }
};
/* please note,
* this enum MUST be 1 greater than the highest value of any enum */
enum slabinfo_item PROCPS_SLABINFO_logical_end = PROCPS_SLABNODE_SIZE + 1;
#undef setNAME
#undef srtNAME
#undef RS
#undef QS
// ___ Private Functions ||||||||||||||||||||||||||||||||||||||||||||||||||||||
// --- slabnode specific support ----------------------------------------------
/* Alloc up more slabnode memory, if required
*/
static int alloc_slabnodes (
struct procps_slabinfo *info)
{
struct slabs_node *new_nodes;
int new_count;
if (info->nodes_used < info->nodes_alloc)
return 0;
/* Increment the allocated number of slabs */
new_count = info->nodes_alloc * 5/4+30;
new_nodes = realloc(info->nodes, sizeof(struct slabs_node) * new_count);
if (!new_nodes)
return -ENOMEM;
info->nodes = new_nodes;
info->nodes_alloc = new_count;
return 0;
} // end: alloc_slabnodes
/*
* get_slabnode - allocate slab_info structures using a free list
*
* In the fast path, we simply return a node off the free list. In the slow
* list, we malloc() a new node. The free list is never automatically reaped,
* both for simplicity and because the number of slab caches is fairly
* constant.
*/
static int get_slabnode (
struct procps_slabinfo *info,
struct slabs_node **node)
{
int retval;
if (info->nodes_used == info->nodes_alloc) {
if ((retval = alloc_slabnodes(info)) < 0)
return retval;
}
*node = &(info->nodes[info->nodes_used++]);
return 0;
} // end: get_slabnode
/* parse_slabinfo20:
*
* sactual parse routine for slabinfo 2.x (2.6 kernels)
* Note: difference between 2.0 and 2.1 is in the ": globalstat" part where version 2.1
* has extra column <nodeallocs>. We don't use ": globalstat" part in both versions.
*
* Formats (we don't use "statistics" extensions)
*
* slabinfo - version: 2.1
* # name <active_objs> <num_objs> <objsize> <objperslab> <pagesperslab> \
* : tunables <batchcount> <limit> <sharedfactor> \
* : slabdata <active_slabs> <num_slabs> <sharedavail>
*
* slabinfo - version: 2.1 (statistics)
* # name <active_objs> <num_objs> <objsize> <objperslab> <pagesperslab> \
* : tunables <batchcount> <limit> <sharedfactor> \
* : slabdata <active_slabs> <num_slabs> <sharedavail> \
* : globalstat <listallocs> <maxobjs> <grown> <reaped> <error> <maxfreeable> <freelimit> <nodeallocs> \
* : cpustat <allochit> <allocmiss> <freehit> <freemiss>
*
* slabinfo - version: 2.0
* # name <active_objs> <num_objs> <objsize> <objperslab> <pagesperslab> \
* : tunables <batchcount> <limit> <sharedfactor> \
* : slabdata <active_slabs> <num_slabs> <sharedavail>
*
* slabinfo - version: 2.0 (statistics)
* # name <active_objs> <num_objs> <objsize> <objperslab> <pagesperslab> \
* : tunables <batchcount> <limit> <sharedfactor> \
* : slabdata <active_slabs> <num_slabs> <sharedavail> \
* : globalstat <listallocs> <maxobjs> <grown> <reaped> <error> <maxfreeable> <freelimit> \
* : cpustat <allochit> <allocmiss> <freehit> <freemiss>
*/
static int parse_slabinfo20 (
struct procps_slabinfo *info)
{
struct slabs_node *node;
char buffer[SLABINFO_LINE_LEN];
int retval;
int page_size = getpagesize();
struct slabs_summ *hist = &(info->hist.new);
hist->min_obj_size = INT_MAX;
hist->max_obj_size = 0;
while (fgets(buffer, SLABINFO_LINE_LEN, info->slabinfo_fp )) {
if (buffer[0] == '#')
continue;
if ((retval = get_slabnode(info, &node)) < 0)
return retval;
if (sscanf(buffer,
"%" STRINGIFY(SLAB_INFO_NAME_LEN) "s" \
"%u %u %u %u %u : tunables %*u %*u %*u : slabdata %u %u %*u",
node->name,
&node->nr_active_objs, &node->nr_objs,
&node->obj_size, &node->objs_per_slab,
&node->pages_per_slab, &node->nr_active_slabs,
&node->nr_slabs) < 8) {
if (errno != 0)
return -errno;
return -EINVAL;
}
if (!node->name[0])
snprintf(node->name, sizeof(node->name), "%s", "unknown");
if (node->obj_size < hist->min_obj_size)
hist->min_obj_size = node->obj_size;
if (node->obj_size > hist->max_obj_size)
hist->max_obj_size = node->obj_size;
node->cache_size = (unsigned long)node->nr_slabs * node->pages_per_slab
* page_size;
if (node->nr_objs) {
node->use = (unsigned int)100 * (node->nr_active_objs / node->nr_objs);
hist->nr_active_caches++;
} else
node->use = 0;
hist->nr_objs += node->nr_objs;
hist->nr_active_objs += node->nr_active_objs;
hist->total_size += (unsigned long)node->nr_objs * node->obj_size;
hist->active_size += (unsigned long)node->nr_active_objs * node->obj_size;
hist->nr_pages += node->nr_slabs * node->pages_per_slab;
hist->nr_slabs += node->nr_slabs;
hist->nr_active_slabs += node->nr_active_slabs;
hist->nr_caches++;
}
if (hist->nr_objs)
hist->avg_obj_size = hist->total_size / hist->nr_objs;
return 0;
} // end: parse_slabinfo20
/* read_slabinfo_failed():
*
* Read the data out of /proc/slabinfo putting the information
* into the supplied info container
*
* Returns: 0 on success, negative on error
*/
static int read_slabinfo_failed (
struct procps_slabinfo *info)
{
char line[SLABINFO_LINE_LEN];
int retval, major, minor;
memcpy(&info->hist.old, &info->hist.new, sizeof(struct slabs_summ));
memset(&(info->hist.new), 0, sizeof(struct slabs_summ));
if ((retval = alloc_slabnodes(info)) < 0)
return retval;
memset(info->nodes, 0, sizeof(struct slabs_node)*info->nodes_alloc);
info->nodes_used = 0;
if (NULL == info->slabinfo_fp
&& (info->slabinfo_fp = fopen(SLABINFO_FILE, "r")) == NULL)
return -errno;
if (fseek(info->slabinfo_fp, 0L, SEEK_SET) < 0)
return -errno;
/* Parse the version string */
if (!fgets(line, SLABINFO_LINE_LEN, info->slabinfo_fp))
return -errno;
if (sscanf(line, "slabinfo - version: %d.%d", &major, &minor) != 2)
return -EINVAL;
if (major == 2)
retval = parse_slabinfo20(info);
else
return -ERANGE;
if (!info->slabinfo_was_read)
memcpy(&info->hist.old, &info->hist.new, sizeof(struct slabs_summ));
info->slabinfo_was_read = 1;
return retval;
} // end: read_slabinfo_failed
// ___ Private Functions ||||||||||||||||||||||||||||||||||||||||||||||||||||||
// --- generalized support ----------------------------------------------------
static inline void assign_results (
struct slabinfo_stack *stack,
struct slabs_hist *summ,
struct slabs_node *node)
{
struct slabinfo_result *this = stack->head;
for (;;) {
enum slabinfo_item item = this->item;
if (item >= PROCPS_SLABINFO_logical_end)
break;
Item_table[item].setsfunc(this, summ, node);
++this;
}
return;
} // end: assign_results
static inline void cleanup_stack (
struct slabinfo_result *this)
{
for (;;) {
if (this->item >= PROCPS_SLABINFO_logical_end)
break;
if (this->item > PROCPS_SLABINFO_noop)
this->result.ul_int = 0;
++this;
}
} // end: cleanup_stack
static inline void cleanup_stacks_all (
struct ext_support *this)
{
int i;
struct stacks_extent *ext = this->extents;
while (ext) {
for (i = 0; ext->stacks[i]; i++)
cleanup_stack(ext->stacks[i]->head);
ext = ext->next;
};
this->dirty_stacks = 0;
} // end: cleanup_stacks_all
static void extents_free_all (
struct ext_support *this)
{
while (this->extents) {
struct stacks_extent *p = this->extents;
this->extents = this->extents->next;
free(p);
};
} // end: extents_free_all
static inline struct slabinfo_result *itemize_stack (
struct slabinfo_result *p,
int depth,
enum slabinfo_item *items)
{
struct slabinfo_result *p_sav = p;
int i;
for (i = 0; i < depth; i++) {
p->item = items[i];
p->result.ul_int = 0;
++p;
}
return p_sav;
} // end: itemize_stack
static void itemize_stacks_all (
struct ext_support *this)
{
struct stacks_extent *ext = this->extents;
while (ext) {
int i;
for (i = 0; ext->stacks[i]; i++)
itemize_stack(ext->stacks[i]->head, this->numitems, this->items);
ext = ext->next;
};
this->dirty_stacks = 0;
} // end: static void itemize_stacks_all
static inline int items_check_failed (
struct ext_support *this,
enum slabinfo_item *items,
int numitems)
{
int i;
/* if an enum is passed instead of an address of one or more enums, ol' gcc
* will silently convert it to an address (possibly NULL). only clang will
* offer any sort of warning like the following:
*
* warning: incompatible integer to pointer conversion passing 'int' to parameter of type 'enum slabinfo_item *'
* my_stack = procps_slabinfo_select(info, PROCPS_SLABINFO_noop, num);
* ^~~~~~~~~~~~~~~~
*/
if (numitems < 1
|| (void *)items < (void *)(unsigned long)(2 * PROCPS_SLABINFO_logical_end))
return -1;
for (i = 0; i < numitems; i++) {
#ifdef ENFORCE_LOGICAL
if (items[i] == PROCPS_SLABINFO_noop
|| (items[i] == PROCPS_SLABINFO_extra))
continue;
if (items[i] < this->lowest
|| (items[i] > this->highest))
return -1;
#else
// a slabinfo_item is currently unsigned, but we'll protect our future
if (items[i] < 0)
return -1;
if (items[i] >= PROCPS_SLABINFO_logical_end)
return -1;
#endif
}
return 0;
} // end: items_check_failed
static struct stacks_extent *stacks_alloc (
struct ext_support *this,
int maxstacks)
{
struct stacks_extent *p_blob;
struct slabinfo_stack **p_vect;
struct slabinfo_stack *p_head;
size_t vect_size, head_size, list_size, blob_size;
void *v_head, *v_list;
int i;
if (this == NULL || this->items == NULL)
return NULL;
if (maxstacks < 1)
return NULL;
vect_size = sizeof(void *) * maxstacks; // size of the addr vectors |
vect_size += sizeof(void *); // plus NULL addr delimiter |
head_size = sizeof(struct slabinfo_stack); // size of that head struct |
list_size = sizeof(struct slabinfo_result)*this->numitems;// any single results stack |
blob_size = sizeof(struct stacks_extent); // the extent anchor itself |
blob_size += vect_size; // plus room for addr vects |
blob_size += head_size * maxstacks; // plus room for head thing |
blob_size += list_size * maxstacks; // plus room for our stacks |
/* note: all of our memory is allocated in a single blob, facilitating a later free(). |
as a minimum, it is important that the result structures themselves always be |
contiguous for every stack since they are accessed through relative position. | */
if (NULL == (p_blob = calloc(1, blob_size)))
return NULL;
p_blob->next = this->extents; // push this extent onto... |
this->extents = p_blob; // ...some existing extents |
p_vect = (void *)p_blob + sizeof(struct stacks_extent); // prime our vector pointer |
p_blob->stacks = p_vect; // set actual vectors start |
v_head = (void *)p_vect + vect_size; // prime head pointer start |
v_list = v_head + (head_size * maxstacks); // prime our stacks pointer |
for (i = 0; i < maxstacks; i++) {
p_head = (struct slabinfo_stack *)v_head;
p_head->head = itemize_stack((struct slabinfo_result *)v_list, this->numitems, this->items);
p_blob->stacks[i] = p_head;
v_list += list_size;
v_head += head_size;
}
p_blob->ext_numstacks = maxstacks;
return p_blob;
} // end: stacks_alloc
static int stacks_fetch (
struct procps_slabinfo *info)
{
#define n_alloc info->fetch.n_alloc
#define n_inuse info->fetch.n_inuse
#define n_saved info->fetch.n_alloc_save
struct stacks_extent *ext;
// initialize stuff -----------------------------------
if (!info->fetch.anchor) {
if (!(info->fetch.anchor = calloc(sizeof(void *), STACKS_INCR)))
return -ENOMEM;
n_alloc = STACKS_INCR;
}
if (!info->fetch_ext.extents) {
if (!(ext = stacks_alloc(&info->fetch_ext, n_alloc)))
return -ENOMEM;
memset(info->fetch.anchor, 0, sizeof(void *) * n_alloc);
memcpy(info->fetch.anchor, ext->stacks, sizeof(void *) * n_alloc);
itemize_stacks_all(&info->fetch_ext);
}
cleanup_stacks_all(&info->fetch_ext);
// iterate stuff --------------------------------------
n_inuse = 0;
while (n_inuse < info->nodes_used) {
if (!(n_inuse < n_alloc)) {
n_alloc += STACKS_INCR;
if ((!(info->fetch.anchor = realloc(info->fetch.anchor, sizeof(void *) * n_alloc)))
|| (!(ext = stacks_alloc(&info->fetch_ext, STACKS_INCR))))
return -1;
memcpy(info->fetch.anchor + n_inuse, ext->stacks, sizeof(void *) * STACKS_INCR);
}
assign_results(info->fetch.anchor[n_inuse], &info->hist, &info->nodes[n_inuse]);
++n_inuse;
}
// finalize stuff -------------------------------------
/* note: we go to this trouble of maintaining a duplicate of the consolidated |
extent stacks addresses represented as our 'anchor' since these ptrs |
are exposed to a user (um, not that we don't trust 'em or anything). |
plus, we can NULL delimit these ptrs which we couldn't do otherwise. | */
if (n_saved < n_inuse + 1) {
n_saved = n_inuse + 1;
if (!(info->fetch.results.stacks = realloc(info->fetch.results.stacks, sizeof(void *) * n_saved)))
return -ENOMEM;
}
memcpy(info->fetch.results.stacks, info->fetch.anchor, sizeof(void *) * n_inuse);
info->fetch.results.stacks[n_inuse] = NULL;
info->fetch.results.total = n_inuse;
return n_inuse;
#undef n_alloc
#undef n_inuse
#undef n_saved
} // end: stacks_fetch
static int stacks_reconfig_maybe (
struct ext_support *this,
enum slabinfo_item *items,
int numitems)
{
if (items_check_failed(this, items, numitems))
return -EINVAL;
/* is this the first time or have things changed since we were last called?
if so, gotta' redo all of our stacks stuff ... */
if (this->numitems != numitems + 1
|| memcmp(this->items, items, sizeof(enum slabinfo_item) * numitems)) {
// allow for our PROCPS_SLABINFO_logical_end
if (!(this->items = realloc(this->items, sizeof(enum slabinfo_item) * (numitems + 1))))
return -ENOMEM;
memcpy(this->items, items, sizeof(enum slabinfo_item) * numitems);
this->items[numitems] = PROCPS_SLABINFO_logical_end;
this->numitems = numitems + 1;
if (this->extents)
extents_free_all(this);
return 1;
}
return 0;
} // end: stacks_reconfig_maybe
// ___ Public Functions |||||||||||||||||||||||||||||||||||||||||||||||||||||||
// --- standard required functions --------------------------------------------
/*
* procps_slabinfo_new():
*
* @info: location of returned new structure
*
* Returns: 0 on success <0 on failure
*/
PROCPS_EXPORT int procps_slabinfo_new (
struct procps_slabinfo **info)
{
struct procps_slabinfo *p;
int rc;
if (info == NULL)
return -EINVAL;
if (!(p = calloc(1, sizeof(struct procps_slabinfo))))
return -ENOMEM;
#ifdef ENFORCE_LOGICAL
p->select_ext.lowest = PROCPS_SLABS_OBJS;
p->select_ext.highest = PROCPS_SLABS_DELTA_SIZE_TOTAL;
p->fetch_ext.lowest = PROCPS_SLABNODE_NAME;
p->fetch_ext.highest = PROCPS_SLABNODE_SIZE;
#endif
p->refcount = 1;
/* do a priming read here for the following potential benefits: |
1) see if that caller's permissions were sufficient (root) |
2) make delta results potentially useful, even if 1st time | */
if ((rc = read_slabinfo_failed(p))) {
procps_slabinfo_unref(&p);
return rc;
}
*info = p;
return 0;
} // end: procps_slabinfo_new
PROCPS_EXPORT int procps_slabinfo_ref (
struct procps_slabinfo *info)
{
if (info == NULL)
return -EINVAL;
info->refcount++;
return info->refcount;
} // end: procps_slabinfo_ref
PROCPS_EXPORT int procps_slabinfo_unref (
struct procps_slabinfo **info)
{
if (info == NULL || *info == NULL)
return -EINVAL;
(*info)->refcount--;
if ((*info)->refcount == 0) {
if ((*info)->slabinfo_fp) {
fclose((*info)->slabinfo_fp);
(*info)->slabinfo_fp = NULL;
}
if ((*info)->select_ext.extents)
extents_free_all((&(*info)->select_ext));
if ((*info)->select_ext.items)
free((*info)->select_ext.items);
if ((*info)->fetch.anchor)
free((*info)->fetch.anchor);
if ((*info)->fetch.results.stacks)
free((*info)->fetch.results.stacks);
if ((*info)->fetch_ext.extents)
extents_free_all(&(*info)->fetch_ext);
if ((*info)->fetch_ext.items)
free((*info)->fetch_ext.items);
free((*info)->nodes);
free(*info);
*info = NULL;
return 0;
}
return (*info)->refcount;
} // end: procps_slabinfo_unref
// --- variable interface functions -------------------------------------------
PROCPS_EXPORT struct slabinfo_result *procps_slabinfo_get (
struct procps_slabinfo *info,
enum slabinfo_item item)
{
static time_t sav_secs;
time_t cur_secs;
if (info == NULL)
return NULL;
if (item < 0 || item >= PROCPS_SLABINFO_logical_end)
return NULL;
/* we will NOT read the slabinfo file with every call - rather, we'll offer
a granularity of 1 second between reads ... */
cur_secs = time(NULL);
if (1 <= cur_secs - sav_secs) {
if (read_slabinfo_failed(info))
return NULL;
sav_secs = cur_secs;
}
info->get_this.item = item;
// with 'get', we must NOT honor the usual 'noop' guarantee
// if (item > PROCPS_SLABINFO_noop)
info->get_this.result.ul_int = 0;
Item_table[item].setsfunc(&info->get_this, &info->hist, &info->nul_node);
return &info->get_this;
} // end: procps_slabinfo_get
/* procps_slabinfo_reap():
*
* Harvest all the requested SLABNODE (individual nodes) information
* providing the result stacks along with the total number of nodes.
*
* Returns: pointer to a slabinfo_reap struct on success, NULL on error.
*/
PROCPS_EXPORT struct slabinfo_reap *procps_slabinfo_reap (
struct procps_slabinfo *info,
enum slabinfo_item *items,
int numitems)
{
if (info == NULL || items == NULL)
return NULL;
if (0 > stacks_reconfig_maybe(&info->fetch_ext, items, numitems))
return NULL;
if (info->fetch_ext.dirty_stacks)
cleanup_stacks_all(&info->fetch_ext);
if (read_slabinfo_failed(info))
return NULL;
stacks_fetch(info);
info->fetch_ext.dirty_stacks = 1;
return &info->fetch.results;
} // end: procps_slabinfo_reap
/* procps_slabinfo_select():
*
* Obtain all the requested SLABS (global) information then return
* it in a single library provided results stack.
*
* Returns: pointer to a slabinfo_stack struct on success, NULL on error.
*/
PROCPS_EXPORT struct slabinfo_stack *procps_slabinfo_select (
struct procps_slabinfo *info,
enum slabinfo_item *items,
int numitems)
{
if (info == NULL || items == NULL)
return NULL;
if (0 > stacks_reconfig_maybe(&info->select_ext, items, numitems))
return NULL;
if (!info->select_ext.extents
&& !(stacks_alloc(&info->select_ext, 1)))
return NULL;
if (info->select_ext.dirty_stacks)
cleanup_stacks_all(&info->select_ext);
if (read_slabinfo_failed(info))
return NULL;
assign_results(info->select_ext.extents->stacks[0], &info->hist, &info->nul_node);
info->select_ext.dirty_stacks = 1;
return info->select_ext.extents->stacks[0];
} // end: procps_slabinfo_select
/*
* procps_slabinfo_sort():
*
* Sort stacks anchored as 'heads' in the passed slabinfo_stack pointers
* array based on the designated sort enumerator.
*
* Returns those same addresses sorted.
*
* Note: all of the stacks must be homogeneous (of equal length and content).
*/
PROCPS_EXPORT struct slabinfo_stack **procps_slabinfo_sort (
struct procps_slabinfo *info,
struct slabinfo_stack *stacks[],
int numstacked,
enum slabinfo_item sortitem,
enum slabinfo_sort_order order)
{
struct slabinfo_result *p;
struct sort_parms parms;
int offset;
if (info == NULL || stacks == NULL)
return NULL;
// a slabinfo_item is currently unsigned, but we'll protect our future
if (sortitem < 0 || sortitem >= PROCPS_SLABINFO_logical_end)
return NULL;
if (order != PROCPS_SLABINFO_ASCEND && order != PROCPS_SLABINFO_DESCEND)
return NULL;
if (numstacked < 2)
return stacks;
offset = 0;
p = stacks[0]->head;
for (;;) {
if (p->item == sortitem)
break;
++offset;
if (p->item == PROCPS_SLABINFO_logical_end)
return NULL;
++p;
}
parms.offset = offset;
parms.order = order;
qsort_r(stacks, numstacked, sizeof(void *), (QSR_t)Item_table[p->item].sortfunc, &parms);
return stacks;
} // end: procps_slabinfo_sort
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