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procps/proc/meminfo.c
Jim Warner 23cfb71366 library: ensure thread safety for all static variables 
Even though we we had to abandon the master branch top
multi-thread effort and even though the newlib version
of a multi-threaded top provides no real benefit, that
whole exercise was not wasted. Rather, it has revealed
some deficiencies in our library which this addresses.

If two or more threads in the same address space tried
to access the same api simultaneously, there is a good
chance some function-local static variables will yield
some of those renowned unpredictable results. So, this
patch protects them with the '__thread' storage class.

Reference(s):
https://www.freelists.org/post/procps/a-few-more-patches,7

Signed-off-by: Jim Warner <james.warner@comcast.net>
2021-10-02 12:55:31 +10:00

1016 lines
35 KiB
C
Raw Blame History

/*
* meminfo.c - memory related definitions for libprocps
*
* Copyright (C) 2015 Craig Small <csmall@dropbear.xyz>
* Copyright (C) 2016-2021 Jim Warner <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 <errno.h>
#include <fcntl.h>
#include <search.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/meminfo.h>
#define MEMINFO_FILE "/proc/meminfo"
#define MEMINFO_BUFF 8192
/* ------------------------------------------------------------------------- +
this provision can be used to ensure that our Item_table was synchronized |
with those enumerators found in the associated header file. It's intended |
to only be used locally (& temporarily) at some point prior to a release! | */
// #define ITEMTABLE_DEBUG //----------------------------------------------- |
// ------------------------------------------------------------------------- +
struct meminfo_data {
unsigned long Active;
unsigned long Active_anon; // as: Active(anon): man 5 proc: 'to be documented'
unsigned long Active_file; // as: Active(file): man 5 proc: 'to be documented'
unsigned long AnonHugePages;
unsigned long AnonPages;
unsigned long Bounce;
unsigned long Buffers;
unsigned long Cached;
unsigned long CmaFree;
unsigned long CmaTotal;
unsigned long CommitLimit;
unsigned long Committed_AS;
unsigned long DirectMap1G;
unsigned long DirectMap2M;
unsigned long DirectMap4M;
unsigned long DirectMap4k;
unsigned long Dirty;
unsigned long FileHugePages;
unsigned long FilePmdMapped;
unsigned long HardwareCorrupted; // man 5 proc: 'to be documented'
unsigned long HighFree;
unsigned long HighTotal;
unsigned long HugePages_Free;
unsigned long HugePages_Rsvd;
unsigned long HugePages_Surp;
unsigned long HugePages_Total;
unsigned long Hugepagesize;
unsigned long Hugetlb;
unsigned long Inactive;
unsigned long Inactive_anon; // as: Inactive(anon): man 5 proc: 'to be documented'
unsigned long Inactive_file; // as: Inactive(file): man 5 proc: 'to be documented'
unsigned long KReclaimable;
unsigned long KernelStack;
unsigned long LowFree;
unsigned long LowTotal;
unsigned long Mapped;
unsigned long MemAvailable;
unsigned long MemFree;
unsigned long MemTotal;
unsigned long Mlocked; // man 5 proc: 'to be documented'
unsigned long MmapCopy; // man 5 proc: 'to be documented'
unsigned long NFS_Unstable;
unsigned long PageTables;
unsigned long Percpu;
unsigned long SReclaimable;
unsigned long SUnreclaim;
unsigned long ShadowCallStack;
unsigned long Shmem;
unsigned long ShmemHugePages;
unsigned long ShmemPmdMapped;
unsigned long Slab;
unsigned long SwapCached;
unsigned long SwapFree;
unsigned long SwapTotal;
unsigned long Unevictable; // man 5 proc: 'to be documented'
unsigned long VmallocChunk;
unsigned long VmallocTotal;
unsigned long VmallocUsed;
unsigned long Writeback;
unsigned long WritebackTmp;
unsigned long derived_mem_cached;
unsigned long derived_mem_hi_used;
unsigned long derived_mem_lo_used;
unsigned long derived_mem_used;
unsigned long derived_swap_used;
};
struct mem_hist {
struct meminfo_data new;
struct meminfo_data old;
};
struct stacks_extent {
int ext_numstacks;
struct stacks_extent *next;
struct meminfo_stack **stacks;
};
struct meminfo_info {
int refcount;
int meminfo_fd;
struct mem_hist hist;
int numitems;
enum meminfo_item *items;
struct stacks_extent *extents;
struct hsearch_data hashtab;
struct meminfo_result get_this;
};
// ___ Results 'Set' Support ||||||||||||||||||||||||||||||||||||||||||||||||||
#define setNAME(e) set_meminfo_ ## e
#define setDECL(e) static void setNAME(e) \
(struct meminfo_result *R, struct mem_hist *H)
// regular assignment
#define MEM_set(e,t,x) setDECL(e) { R->result. t = H->new. x; }
// delta assignment
#define HST_set(e,t,x) setDECL(e) { R->result. t = ( H->new. x - H->old. x ); }
setDECL(noop) { (void)R; (void)H; }
setDECL(extra) { (void)H; R->result.ul_int = 0; }
MEM_set(MEM_ACTIVE, ul_int, Active)
MEM_set(MEM_ACTIVE_ANON, ul_int, Active_anon)
MEM_set(MEM_ACTIVE_FILE, ul_int, Active_file)
MEM_set(MEM_ANON, ul_int, AnonPages)
MEM_set(MEM_AVAILABLE, ul_int, MemAvailable)
MEM_set(MEM_BOUNCE, ul_int, Bounce)
MEM_set(MEM_BUFFERS, ul_int, Buffers)
MEM_set(MEM_CACHED, ul_int, Cached)
MEM_set(MEM_CACHED_ALL, ul_int, derived_mem_cached)
MEM_set(MEM_CMA_FREE, ul_int, CmaFree)
MEM_set(MEM_CMA_TOTAL, ul_int, CmaTotal)
MEM_set(MEM_COMMITTED_AS, ul_int, Committed_AS)
MEM_set(MEM_COMMIT_LIMIT, ul_int, CommitLimit)
MEM_set(MEM_DIRECTMAP_1G, ul_int, DirectMap1G)
MEM_set(MEM_DIRECTMAP_2M, ul_int, DirectMap2M)
MEM_set(MEM_DIRECTMAP_4K, ul_int, DirectMap4k)
MEM_set(MEM_DIRECTMAP_4M, ul_int, DirectMap4M)
MEM_set(MEM_DIRTY, ul_int, Dirty)
MEM_set(MEM_FILE_HUGEPAGES, ul_int, FileHugePages)
MEM_set(MEM_FILE_PMDMAPPED, ul_int, FilePmdMapped)
MEM_set(MEM_FREE, ul_int, MemFree)
MEM_set(MEM_HARD_CORRUPTED, ul_int, HardwareCorrupted)
MEM_set(MEM_HIGH_FREE, ul_int, HighFree)
MEM_set(MEM_HIGH_TOTAL, ul_int, HighTotal)
MEM_set(MEM_HIGH_USED, ul_int, derived_mem_hi_used)
MEM_set(MEM_HUGETBL, ul_int, Hugetlb)
MEM_set(MEM_HUGE_ANON, ul_int, AnonHugePages)
MEM_set(MEM_HUGE_FREE, ul_int, HugePages_Free)
MEM_set(MEM_HUGE_RSVD, ul_int, HugePages_Rsvd)
MEM_set(MEM_HUGE_SIZE, ul_int, Hugepagesize)
MEM_set(MEM_HUGE_SURPLUS, ul_int, HugePages_Surp)
MEM_set(MEM_HUGE_TOTAL, ul_int, HugePages_Total)
MEM_set(MEM_INACTIVE, ul_int, Inactive)
MEM_set(MEM_INACTIVE_ANON, ul_int, Inactive_anon)
MEM_set(MEM_INACTIVE_FILE, ul_int, Inactive_file)
MEM_set(MEM_KERNEL_RECLAIM, ul_int, KReclaimable)
MEM_set(MEM_KERNEL_STACK, ul_int, KernelStack)
MEM_set(MEM_LOCKED, ul_int, Mlocked)
MEM_set(MEM_LOW_FREE, ul_int, LowFree)
MEM_set(MEM_LOW_TOTAL, ul_int, LowTotal)
MEM_set(MEM_LOW_USED, ul_int, derived_mem_lo_used)
MEM_set(MEM_MAPPED, ul_int, Mapped)
MEM_set(MEM_MAP_COPY, ul_int, MmapCopy)
MEM_set(MEM_NFS_UNSTABLE, ul_int, NFS_Unstable)
MEM_set(MEM_PAGE_TABLES, ul_int, PageTables)
MEM_set(MEM_PER_CPU, ul_int, Percpu)
MEM_set(MEM_SHADOWCALLSTACK, ul_int, ShadowCallStack)
MEM_set(MEM_SHARED, ul_int, Shmem)
MEM_set(MEM_SHMEM_HUGE, ul_int, ShmemHugePages)
MEM_set(MEM_SHMEM_HUGE_MAP, ul_int, ShmemPmdMapped)
MEM_set(MEM_SLAB, ul_int, Slab)
MEM_set(MEM_SLAB_RECLAIM, ul_int, SReclaimable)
MEM_set(MEM_SLAB_UNRECLAIM, ul_int, SUnreclaim)
MEM_set(MEM_TOTAL, ul_int, MemTotal)
MEM_set(MEM_UNEVICTABLE, ul_int, Unevictable)
MEM_set(MEM_USED, ul_int, derived_mem_used)
MEM_set(MEM_VM_ALLOC_CHUNK, ul_int, VmallocChunk)
MEM_set(MEM_VM_ALLOC_TOTAL, ul_int, VmallocTotal)
MEM_set(MEM_VM_ALLOC_USED, ul_int, VmallocUsed)
MEM_set(MEM_WRITEBACK, ul_int, Writeback)
MEM_set(MEM_WRITEBACK_TMP, ul_int, WritebackTmp)
HST_set(DELTA_ACTIVE, s_int, Active)
HST_set(DELTA_ACTIVE_ANON, s_int, Active_anon)
HST_set(DELTA_ACTIVE_FILE, s_int, Active_file)
HST_set(DELTA_ANON, s_int, AnonPages)
HST_set(DELTA_AVAILABLE, s_int, MemAvailable)
HST_set(DELTA_BOUNCE, s_int, Bounce)
HST_set(DELTA_BUFFERS, s_int, Buffers)
HST_set(DELTA_CACHED, s_int, Cached)
HST_set(DELTA_CACHED_ALL, s_int, derived_mem_cached)
HST_set(DELTA_CMA_FREE, s_int, CmaFree)
HST_set(DELTA_CMA_TOTAL, s_int, CmaTotal)
HST_set(DELTA_COMMITTED_AS, s_int, Committed_AS)
HST_set(DELTA_COMMIT_LIMIT, s_int, CommitLimit)
HST_set(DELTA_DIRECTMAP_1G, s_int, DirectMap1G)
HST_set(DELTA_DIRECTMAP_2M, s_int, DirectMap2M)
HST_set(DELTA_DIRECTMAP_4K, s_int, DirectMap4k)
HST_set(DELTA_DIRECTMAP_4M, s_int, DirectMap4M)
HST_set(DELTA_DIRTY, s_int, Dirty)
HST_set(DELTA_FILE_HUGEPAGES, s_int, FileHugePages)
HST_set(DELTA_FILE_PMDMAPPED, s_int, FilePmdMapped)
HST_set(DELTA_FREE, s_int, MemFree)
HST_set(DELTA_HARD_CORRUPTED, s_int, HardwareCorrupted)
HST_set(DELTA_HIGH_FREE, s_int, HighFree)
HST_set(DELTA_HIGH_TOTAL, s_int, HighTotal)
HST_set(DELTA_HIGH_USED, s_int, derived_mem_hi_used)
HST_set(DELTA_HUGETBL, s_int, Hugetlb)
HST_set(DELTA_HUGE_ANON, s_int, AnonHugePages)
HST_set(DELTA_HUGE_FREE, s_int, HugePages_Free)
HST_set(DELTA_HUGE_RSVD, s_int, HugePages_Rsvd)
HST_set(DELTA_HUGE_SIZE, s_int, Hugepagesize)
HST_set(DELTA_HUGE_SURPLUS, s_int, HugePages_Surp)
HST_set(DELTA_HUGE_TOTAL, s_int, HugePages_Total)
HST_set(DELTA_INACTIVE, s_int, Inactive)
HST_set(DELTA_INACTIVE_ANON, s_int, Inactive_anon)
HST_set(DELTA_INACTIVE_FILE, s_int, Inactive_file)
HST_set(DELTA_KERNEL_RECLAIM, s_int, KReclaimable)
HST_set(DELTA_KERNEL_STACK, s_int, KernelStack)
HST_set(DELTA_LOCKED, s_int, Mlocked)
HST_set(DELTA_LOW_FREE, s_int, LowFree)
HST_set(DELTA_LOW_TOTAL, s_int, LowTotal)
HST_set(DELTA_LOW_USED, s_int, derived_mem_lo_used)
HST_set(DELTA_MAPPED, s_int, Mapped)
HST_set(DELTA_MAP_COPY, s_int, MmapCopy)
HST_set(DELTA_NFS_UNSTABLE, s_int, NFS_Unstable)
HST_set(DELTA_PAGE_TABLES, s_int, PageTables)
HST_set(DELTA_PER_CPU, s_int, Percpu)
HST_set(DELTA_SHADOWCALLSTACK, s_int, ShadowCallStack)
HST_set(DELTA_SHARED, s_int, Shmem)
HST_set(DELTA_SHMEM_HUGE, s_int, ShmemHugePages)
HST_set(DELTA_SHMEM_HUGE_MAP, s_int, ShmemPmdMapped)
HST_set(DELTA_SLAB, s_int, Slab)
HST_set(DELTA_SLAB_RECLAIM, s_int, SReclaimable)
HST_set(DELTA_SLAB_UNRECLAIM, s_int, SUnreclaim)
HST_set(DELTA_TOTAL, s_int, MemTotal)
HST_set(DELTA_UNEVICTABLE, s_int, Unevictable)
HST_set(DELTA_USED, s_int, derived_mem_used)
HST_set(DELTA_VM_ALLOC_CHUNK, s_int, VmallocChunk)
HST_set(DELTA_VM_ALLOC_TOTAL, s_int, VmallocTotal)
HST_set(DELTA_VM_ALLOC_USED, s_int, VmallocUsed)
HST_set(DELTA_WRITEBACK, s_int, Writeback)
HST_set(DELTA_WRITEBACK_TMP, s_int, WritebackTmp)
MEM_set(SWAP_CACHED, ul_int, SwapCached)
MEM_set(SWAP_FREE, ul_int, SwapFree)
MEM_set(SWAP_TOTAL, ul_int, SwapTotal)
MEM_set(SWAP_USED, ul_int, derived_swap_used)
HST_set(SWAP_DELTA_CACHED, s_int, SwapCached)
HST_set(SWAP_DELTA_FREE, s_int, SwapFree)
HST_set(SWAP_DELTA_TOTAL, s_int, SwapTotal)
HST_set(SWAP_DELTA_USED, s_int, derived_swap_used)
#undef setDECL
#undef MEM_set
#undef HST_set
// ___ Controlling Table ||||||||||||||||||||||||||||||||||||||||||||||||||||||
typedef void (*SET_t)(struct meminfo_result *, struct mem_hist *);
#ifdef ITEMTABLE_DEBUG
#define RS(e) (SET_t)setNAME(e), MEMINFO_ ## e, STRINGIFY(MEMINFO_ ## e)
#else
#define RS(e) (SET_t)setNAME(e)
#endif
#define TS(t) STRINGIFY(t)
#define TS_noop ""
/*
* Need it be said?
* This table must be kept in the exact same order as
* those 'enum meminfo_item' guys ! */
static struct {
SET_t setsfunc; // the actual result setting routine
#ifdef ITEMTABLE_DEBUG
int enumnumb; // enumerator (must match position!)
char *enum2str; // enumerator name as a char* string
#endif
char *type2str; // the result type as a string value
} Item_table[] = {
/* setsfunc type2str
------------------------- ---------- */
{ RS(noop), TS_noop },
{ RS(extra), TS_noop },
{ RS(MEM_ACTIVE), TS(ul_int) },
{ RS(MEM_ACTIVE_ANON), TS(ul_int) },
{ RS(MEM_ACTIVE_FILE), TS(ul_int) },
{ RS(MEM_ANON), TS(ul_int) },
{ RS(MEM_AVAILABLE), TS(ul_int) },
{ RS(MEM_BOUNCE), TS(ul_int) },
{ RS(MEM_BUFFERS), TS(ul_int) },
{ RS(MEM_CACHED), TS(ul_int) },
{ RS(MEM_CACHED_ALL), TS(ul_int) },
{ RS(MEM_CMA_FREE), TS(ul_int) },
{ RS(MEM_CMA_TOTAL), TS(ul_int) },
{ RS(MEM_COMMITTED_AS), TS(ul_int) },
{ RS(MEM_COMMIT_LIMIT), TS(ul_int) },
{ RS(MEM_DIRECTMAP_1G), TS(ul_int) },
{ RS(MEM_DIRECTMAP_2M), TS(ul_int) },
{ RS(MEM_DIRECTMAP_4K), TS(ul_int) },
{ RS(MEM_DIRECTMAP_4M), TS(ul_int) },
{ RS(MEM_DIRTY), TS(ul_int) },
{ RS(MEM_FILE_HUGEPAGES), TS(ul_int) },
{ RS(MEM_FILE_PMDMAPPED), TS(ul_int) },
{ RS(MEM_FREE), TS(ul_int) },
{ RS(MEM_HARD_CORRUPTED), TS(ul_int) },
{ RS(MEM_HIGH_FREE), TS(ul_int) },
{ RS(MEM_HIGH_TOTAL), TS(ul_int) },
{ RS(MEM_HIGH_USED), TS(ul_int) },
{ RS(MEM_HUGETBL), TS(ul_int) },
{ RS(MEM_HUGE_ANON), TS(ul_int) },
{ RS(MEM_HUGE_FREE), TS(ul_int) },
{ RS(MEM_HUGE_RSVD), TS(ul_int) },
{ RS(MEM_HUGE_SIZE), TS(ul_int) },
{ RS(MEM_HUGE_SURPLUS), TS(ul_int) },
{ RS(MEM_HUGE_TOTAL), TS(ul_int) },
{ RS(MEM_INACTIVE), TS(ul_int) },
{ RS(MEM_INACTIVE_ANON), TS(ul_int) },
{ RS(MEM_INACTIVE_FILE), TS(ul_int) },
{ RS(MEM_KERNEL_RECLAIM), TS(ul_int) },
{ RS(MEM_KERNEL_STACK), TS(ul_int) },
{ RS(MEM_LOCKED), TS(ul_int) },
{ RS(MEM_LOW_FREE), TS(ul_int) },
{ RS(MEM_LOW_TOTAL), TS(ul_int) },
{ RS(MEM_LOW_USED), TS(ul_int) },
{ RS(MEM_MAPPED), TS(ul_int) },
{ RS(MEM_MAP_COPY), TS(ul_int) },
{ RS(MEM_NFS_UNSTABLE), TS(ul_int) },
{ RS(MEM_PAGE_TABLES), TS(ul_int) },
{ RS(MEM_PER_CPU), TS(ul_int) },
{ RS(MEM_SHADOWCALLSTACK), TS(ul_int) },
{ RS(MEM_SHARED), TS(ul_int) },
{ RS(MEM_SHMEM_HUGE), TS(ul_int) },
{ RS(MEM_SHMEM_HUGE_MAP), TS(ul_int) },
{ RS(MEM_SLAB), TS(ul_int) },
{ RS(MEM_SLAB_RECLAIM), TS(ul_int) },
{ RS(MEM_SLAB_UNRECLAIM), TS(ul_int) },
{ RS(MEM_TOTAL), TS(ul_int) },
{ RS(MEM_UNEVICTABLE), TS(ul_int) },
{ RS(MEM_USED), TS(ul_int) },
{ RS(MEM_VM_ALLOC_CHUNK), TS(ul_int) },
{ RS(MEM_VM_ALLOC_TOTAL), TS(ul_int) },
{ RS(MEM_VM_ALLOC_USED), TS(ul_int) },
{ RS(MEM_WRITEBACK), TS(ul_int) },
{ RS(MEM_WRITEBACK_TMP), TS(ul_int) },
{ RS(DELTA_ACTIVE), TS(s_int) },
{ RS(DELTA_ACTIVE_ANON), TS(s_int) },
{ RS(DELTA_ACTIVE_FILE), TS(s_int) },
{ RS(DELTA_ANON), TS(s_int) },
{ RS(DELTA_AVAILABLE), TS(s_int) },
{ RS(DELTA_BOUNCE), TS(s_int) },
{ RS(DELTA_BUFFERS), TS(s_int) },
{ RS(DELTA_CACHED), TS(s_int) },
{ RS(DELTA_CACHED_ALL), TS(s_int) },
{ RS(DELTA_CMA_FREE), TS(s_int) },
{ RS(DELTA_CMA_TOTAL), TS(s_int) },
{ RS(DELTA_COMMITTED_AS), TS(s_int) },
{ RS(DELTA_COMMIT_LIMIT), TS(s_int) },
{ RS(DELTA_DIRECTMAP_1G), TS(s_int) },
{ RS(DELTA_DIRECTMAP_2M), TS(s_int) },
{ RS(DELTA_DIRECTMAP_4K), TS(s_int) },
{ RS(DELTA_DIRECTMAP_4M), TS(s_int) },
{ RS(DELTA_DIRTY), TS(s_int) },
{ RS(DELTA_FILE_HUGEPAGES), TS(s_int) },
{ RS(DELTA_FILE_PMDMAPPED), TS(s_int) },
{ RS(DELTA_FREE), TS(s_int) },
{ RS(DELTA_HARD_CORRUPTED), TS(s_int) },
{ RS(DELTA_HIGH_FREE), TS(s_int) },
{ RS(DELTA_HIGH_TOTAL), TS(s_int) },
{ RS(DELTA_HIGH_USED), TS(s_int) },
{ RS(DELTA_HUGETBL), TS(s_int) },
{ RS(DELTA_HUGE_ANON), TS(s_int) },
{ RS(DELTA_HUGE_FREE), TS(s_int) },
{ RS(DELTA_HUGE_RSVD), TS(s_int) },
{ RS(DELTA_HUGE_SIZE), TS(s_int) },
{ RS(DELTA_HUGE_SURPLUS), TS(s_int) },
{ RS(DELTA_HUGE_TOTAL), TS(s_int) },
{ RS(DELTA_INACTIVE), TS(s_int) },
{ RS(DELTA_INACTIVE_ANON), TS(s_int) },
{ RS(DELTA_INACTIVE_FILE), TS(s_int) },
{ RS(DELTA_KERNEL_RECLAIM), TS(s_int) },
{ RS(DELTA_KERNEL_STACK), TS(s_int) },
{ RS(DELTA_LOCKED), TS(s_int) },
{ RS(DELTA_LOW_FREE), TS(s_int) },
{ RS(DELTA_LOW_TOTAL), TS(s_int) },
{ RS(DELTA_LOW_USED), TS(s_int) },
{ RS(DELTA_MAPPED), TS(s_int) },
{ RS(DELTA_MAP_COPY), TS(s_int) },
{ RS(DELTA_NFS_UNSTABLE), TS(s_int) },
{ RS(DELTA_PAGE_TABLES), TS(s_int) },
{ RS(DELTA_PER_CPU), TS(s_int) },
{ RS(DELTA_SHADOWCALLSTACK), TS(s_int) },
{ RS(DELTA_SHARED), TS(s_int) },
{ RS(DELTA_SHMEM_HUGE), TS(s_int) },
{ RS(DELTA_SHMEM_HUGE_MAP), TS(s_int) },
{ RS(DELTA_SLAB), TS(s_int) },
{ RS(DELTA_SLAB_RECLAIM), TS(s_int) },
{ RS(DELTA_SLAB_UNRECLAIM), TS(s_int) },
{ RS(DELTA_TOTAL), TS(s_int) },
{ RS(DELTA_UNEVICTABLE), TS(s_int) },
{ RS(DELTA_USED), TS(s_int) },
{ RS(DELTA_VM_ALLOC_CHUNK), TS(s_int) },
{ RS(DELTA_VM_ALLOC_TOTAL), TS(s_int) },
{ RS(DELTA_VM_ALLOC_USED), TS(s_int) },
{ RS(DELTA_WRITEBACK), TS(s_int) },
{ RS(DELTA_WRITEBACK_TMP), TS(s_int) },
{ RS(SWAP_CACHED), TS(ul_int) },
{ RS(SWAP_FREE), TS(ul_int) },
{ RS(SWAP_TOTAL), TS(ul_int) },
{ RS(SWAP_USED), TS(ul_int) },
{ RS(SWAP_DELTA_CACHED), TS(s_int) },
{ RS(SWAP_DELTA_FREE), TS(s_int) },
{ RS(SWAP_DELTA_TOTAL), TS(s_int) },
{ RS(SWAP_DELTA_USED), TS(s_int) },
};
/* please note,
* this enum MUST be 1 greater than the highest value of any enum */
enum meminfo_item MEMINFO_logical_end = MAXTABLE(Item_table);
#undef setNAME
#undef RS
// ___ Private Functions ||||||||||||||||||||||||||||||||||||||||||||||||||||||
static inline void meminfo_assign_results (
struct meminfo_stack *stack,
struct mem_hist *hist)
{
struct meminfo_result *this = stack->head;
for (;;) {
enum meminfo_item item = this->item;
if (item >= MEMINFO_logical_end)
break;
Item_table[item].setsfunc(this, hist);
++this;
}
return;
} // end: meminfo_assign_results
static void meminfo_extents_free_all (
struct meminfo_info *info)
{
while (info->extents) {
struct stacks_extent *p = info->extents;
info->extents = info->extents->next;
free(p);
};
} // end: meminfo_extents_free_all
static inline struct meminfo_result *meminfo_itemize_stack (
struct meminfo_result *p,
int depth,
enum meminfo_item *items)
{
struct meminfo_result *p_sav = p;
int i;
for (i = 0; i < depth; i++) {
p->item = items[i];
++p;
}
return p_sav;
} // end: meminfo_itemize_stack
static inline int meminfo_items_check_failed (
int numitems,
enum meminfo_item *items)
{
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 meminfo_item *'
* my_stack = procps_meminfo_select(info, MEMINFO_noop, num);
* ^~~~~~~~~~~~~~~~
*/
if (numitems < 1
|| (void *)items < (void *)(unsigned long)(2 * MEMINFO_logical_end))
return 1;
for (i = 0; i < numitems; i++) {
// a meminfo_item is currently unsigned, but we'll protect our future
if (items[i] < 0)
return 1;
if (items[i] >= MEMINFO_logical_end)
return 1;
}
return 0;
} // end: meminfo_items_check_failed
static int meminfo_make_hash_failed (
struct meminfo_info *info)
{
#define htVAL(f) e.key = STRINGIFY(f); e.data = &info->hist.new. f; \
if (!hsearch_r(e, ENTER, &ep, &info->hashtab)) return 1;
#define htXTRA(k,f) e.key = STRINGIFY(k); e.data = &info->hist.new. f; \
if (!hsearch_r(e, ENTER, &ep, &info->hashtab)) return 1;
ENTRY e, *ep;
size_t n;
// will also include those derived fields (more is better)
n = sizeof(struct meminfo_data) / sizeof(unsigned long);
// we'll follow the hsearch recommendation of an extra 25%
if (!hcreate_r(n + (n / 4), &info->hashtab))
return 1;
htVAL(Active)
htXTRA(Active(anon), Active_anon)
htXTRA(Active(file), Active_file)
htVAL(AnonHugePages)
htVAL(AnonPages)
htVAL(Bounce)
htVAL(Buffers)
htVAL(Cached)
htVAL(CmaFree)
htVAL(CmaTotal)
htVAL(CommitLimit)
htVAL(Committed_AS)
htVAL(DirectMap1G)
htVAL(DirectMap2M)
htVAL(DirectMap4M)
htVAL(DirectMap4k)
htVAL(Dirty)
htVAL(FileHugePages)
htVAL(FilePmdMapped)
htVAL(HardwareCorrupted)
htVAL(HighFree)
htVAL(HighTotal)
htVAL(HugePages_Free)
htVAL(HugePages_Rsvd)
htVAL(HugePages_Surp)
htVAL(HugePages_Total)
htVAL(Hugepagesize)
htVAL(Hugetlb)
htVAL(Inactive)
htXTRA(Inactive(anon), Inactive_anon)
htXTRA(Inactive(file), Inactive_file)
htVAL(KReclaimable)
htVAL(KernelStack)
htVAL(LowFree)
htVAL(LowTotal)
htVAL(Mapped)
htVAL(MemAvailable)
htVAL(MemFree)
htVAL(MemTotal)
htVAL(Mlocked)
htVAL(MmapCopy)
htVAL(NFS_Unstable)
htVAL(PageTables)
htVAL(Percpu)
htVAL(SReclaimable)
htVAL(SUnreclaim)
htVAL(ShadowCallStack)
htVAL(Shmem)
htVAL(ShmemHugePages)
htVAL(ShmemPmdMapped)
htVAL(Slab)
htVAL(SwapCached)
htVAL(SwapFree)
htVAL(SwapTotal)
htVAL(Unevictable)
htVAL(VmallocChunk)
htVAL(VmallocTotal)
htVAL(VmallocUsed)
htVAL(Writeback)
htVAL(WritebackTmp)
return 0;
#undef htVAL
#undef htXTRA
} // end: meminfo_make_hash_failed
/*
* meminfo_read_failed():
*
* Read the data out of /proc/meminfo putting the information
* into the supplied info structure
*/
static int meminfo_read_failed (
struct meminfo_info *info)
{
/* a 'memory history reference' macro for readability,
so we can focus the field names ... */
#define mHr(f) info->hist.new. f
char buf[MEMINFO_BUFF];
char *head, *tail;
int size;
unsigned long *valptr;
signed long mem_used;
// remember history from last time around
memcpy(&info->hist.old, &info->hist.new, sizeof(struct meminfo_data));
// clear out the soon to be 'current' values
memset(&info->hist.new, 0, sizeof(struct meminfo_data));
if (-1 == info->meminfo_fd
&& (-1 == (info->meminfo_fd = open(MEMINFO_FILE, O_RDONLY))))
return 1;
if (lseek(info->meminfo_fd, 0L, SEEK_SET) == -1)
return 1;
for (;;) {
if ((size = read(info->meminfo_fd, buf, sizeof(buf)-1)) < 0) {
if (errno == EINTR || errno == EAGAIN)
continue;
return 1;
}
break;
}
if (size == 0) {
errno = EIO;
return 1;
}
buf[size] = '\0';
head = buf;
for (;;) {
static __thread ENTRY e; // keep coverity off our backs (e.data)
ENTRY *ep;
if (!(tail = strchr(head, ':')))
break;
*tail = '\0';
valptr = NULL;
e.key = head;
if (hsearch_r(e, FIND, &ep, &info->hashtab))
valptr = ep->data;
head = tail + 1;
if (valptr)
*valptr = strtoul(head, NULL, 10);
if (!(tail = strchr(head, '\n')))
break;
head = tail + 1;
}
if (0 == mHr(MemAvailable))
mHr(MemAvailable) = mHr(MemFree);
mHr(derived_mem_cached) = mHr(Cached) + mHr(SReclaimable);
/* if 'available' is greater than 'total' or our calculation of mem_used
overflows, that's symptomatic of running within a lxc container where
such values will be dramatically distorted over those of the host. */
if (mHr(MemAvailable) > mHr(MemTotal))
mHr(MemAvailable) = mHr(MemFree);
mem_used = mHr(MemTotal) - mHr(MemFree) - mHr(derived_mem_cached) - mHr(Buffers);
if (mem_used < 0)
mem_used = mHr(MemTotal) - mHr(MemFree);
mHr(derived_mem_used) = (unsigned long)mem_used;
if (mHr(HighFree) < mHr(HighTotal))
mHr(derived_mem_hi_used) = mHr(HighTotal) - mHr(HighFree);
if (0 == mHr(LowTotal)) {
mHr(LowTotal) = mHr(MemTotal);
mHr(LowFree) = mHr(MemFree);
}
if (mHr(LowFree) < mHr(LowTotal))
mHr(derived_mem_lo_used) = mHr(LowTotal) - mHr(LowFree);
if (mHr(SwapFree) < mHr(SwapTotal))
mHr(derived_swap_used) = mHr(SwapTotal) - mHr(SwapFree);
else
mHr(derived_swap_used) = 0;
return 0;
#undef mHr
} // end: meminfo_read_failed
/*
* meminfo_stacks_alloc():
*
* Allocate and initialize one or more stacks each of which is anchored in an
* associated context structure.
*
* All such stacks will have their result structures properly primed with
* 'items', while the result itself will be zeroed.
*
* Returns a stacks_extent struct anchoring the 'heads' of each new stack.
*/
static struct stacks_extent *meminfo_stacks_alloc (
struct meminfo_info *info,
int maxstacks)
{
struct stacks_extent *p_blob;
struct meminfo_stack **p_vect;
struct meminfo_stack *p_head;
size_t vect_size, head_size, list_size, blob_size;
void *v_head, *v_list;
int i;
vect_size = sizeof(void *) * maxstacks; // size of the addr vectors |
vect_size += sizeof(void *); // plus NULL addr delimiter |
head_size = sizeof(struct meminfo_stack); // size of that head struct |
list_size = sizeof(struct meminfo_result)*info->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 this memory is allocated in a single blob, facilitating a later free(). |
as a minimum, it is important that the result structures themselves always are |
contiguous within each stack since they're accessed through relative position. | */
if (NULL == (p_blob = calloc(1, blob_size)))
return NULL;
p_blob->next = info->extents; // push this extent onto... |
info->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 meminfo_stack *)v_head;
p_head->head = meminfo_itemize_stack((struct meminfo_result *)v_list, info->numitems, info->items);
p_blob->stacks[i] = p_head;
v_list += list_size;
v_head += head_size;
}
p_blob->ext_numstacks = maxstacks;
return p_blob;
} // end: meminfo_stacks_alloc
// ___ Public Functions |||||||||||||||||||||||||||||||||||||||||||||||||||||||
// --- standard required functions --------------------------------------------
/*
* procps_meminfo_new:
*
* Create a new container to hold the stat information
*
* The initial refcount is 1, and needs to be decremented
* to release the resources of the structure.
*
* Returns: < 0 on failure, 0 on success along with
* a pointer to a new context struct
*/
PROCPS_EXPORT int procps_meminfo_new (
struct meminfo_info **info)
{
struct meminfo_info *p;
#ifdef ITEMTABLE_DEBUG
int i, failed = 0;
for (i = 0; i < MAXTABLE(Item_table); i++) {
if (i != Item_table[i].enumnumb) {
fprintf(stderr, "%s: enum/table error: Item_table[%d] was %s, but its value is %d\n"
, __FILE__, i, Item_table[i].enum2str, Item_table[i].enumnumb);
failed = 1;
}
}
if (failed) _Exit(EXIT_FAILURE);
#endif
if (info == NULL || *info != NULL)
return -EINVAL;
if (!(p = calloc(1, sizeof(struct meminfo_info))))
return -ENOMEM;
p->refcount = 1;
p->meminfo_fd = -1;
if (meminfo_make_hash_failed(p)) {
free(p);
return -errno;
}
/* do a priming read here for the following potential benefits: |
1) ensure there will be no problems with subsequent access |
2) make delta results potentially useful, even if 1st time |
3) elimnate need for history distortions 1st time 'switch' | */
if (meminfo_read_failed(p)) {
procps_meminfo_unref(&p);
return -errno;
}
*info = p;
return 0;
} // end: procps_meminfo_new
PROCPS_EXPORT int procps_meminfo_ref (
struct meminfo_info *info)
{
if (info == NULL)
return -EINVAL;
info->refcount++;
return info->refcount;
} // end: procps_meminfo_ref
PROCPS_EXPORT int procps_meminfo_unref (
struct meminfo_info **info)
{
if (info == NULL || *info == NULL)
return -EINVAL;
(*info)->refcount--;
if ((*info)->refcount < 1) {
int errno_sav = errno;
if ((*info)->extents)
meminfo_extents_free_all((*info));
if ((*info)->items)
free((*info)->items);
hdestroy_r(&(*info)->hashtab);
free(*info);
*info = NULL;
errno = errno_sav;
return 0;
}
return (*info)->refcount;
} // end: procps_meminfo_unref
// --- variable interface functions -------------------------------------------
PROCPS_EXPORT struct meminfo_result *procps_meminfo_get (
struct meminfo_info *info,
enum meminfo_item item)
{
static __thread time_t sav_secs;
time_t cur_secs;
errno = EINVAL;
if (info == NULL)
return NULL;
if (item < 0 || item >= MEMINFO_logical_end)
return NULL;
errno = 0;
/* we will NOT read the meminfo 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 (meminfo_read_failed(info))
return NULL;
sav_secs = cur_secs;
}
info->get_this.item = item;
// with 'get', we must NOT honor the usual 'noop' guarantee
info->get_this.result.ul_int = 0;
Item_table[item].setsfunc(&info->get_this, &info->hist);
return &info->get_this;
} // end: procps_meminfo_get
/* procps_meminfo_select():
*
* Harvest all the requested MEM and/or SWAP information then return
* it in a results stack.
*
* Returns: pointer to a meminfo_stack struct on success, NULL on error.
*/
PROCPS_EXPORT struct meminfo_stack *procps_meminfo_select (
struct meminfo_info *info,
enum meminfo_item *items,
int numitems)
{
errno = EINVAL;
if (info == NULL || items == NULL)
return NULL;
if (meminfo_items_check_failed(numitems, items))
return NULL;
errno = 0;
/* is this the first time or have things changed since we were last called?
if so, gotta' redo all of our stacks stuff ... */
if (info->numitems != numitems + 1
|| memcmp(info->items, items, sizeof(enum meminfo_item) * numitems)) {
// allow for our MEMINFO_logical_end
if (!(info->items = realloc(info->items, sizeof(enum meminfo_item) * (numitems + 1))))
return NULL;
memcpy(info->items, items, sizeof(enum meminfo_item) * numitems);
info->items[numitems] = MEMINFO_logical_end;
info->numitems = numitems + 1;
if (info->extents)
meminfo_extents_free_all(info);
}
if (!info->extents
&& (!meminfo_stacks_alloc(info, 1)))
return NULL;
if (meminfo_read_failed(info))
return NULL;
meminfo_assign_results(info->extents->stacks[0], &info->hist);
return info->extents->stacks[0];
} // end: procps_meminfo_select
// --- special debugging function(s) ------------------------------------------
/*
* The following isn't part of the normal programming interface. Rather,
* it exists to validate result types referenced in application programs.
*
* It's used only when:
* 1) the 'XTRA_PROCPS_DEBUG' has been defined, or
* 2) an #include of 'xtra-procps-debug.h' is used
*/
PROCPS_EXPORT struct meminfo_result *xtra_meminfo_get (
struct meminfo_info *info,
enum meminfo_item actual_enum,
const char *typestr,
const char *file,
int lineno)
{
struct meminfo_result *r = procps_meminfo_get(info, actual_enum);
if (actual_enum < 0 || actual_enum >= MEMINFO_logical_end) {
fprintf(stderr, "%s line %d: invalid item = %d, type = %s\n"
, file, lineno, actual_enum, typestr);
}
if (r) {
char *str = Item_table[r->item].type2str;
if (str[0]
&& (strcmp(typestr, str)))
fprintf(stderr, "%s line %d: was %s, expected %s\n", file, lineno, typestr, str);
}
return r;
} // end: xtra_meminfo_get_
PROCPS_EXPORT struct meminfo_result *xtra_meminfo_val (
int relative_enum,
const char *typestr,
const struct meminfo_stack *stack,
struct meminfo_info *info,
const char *file,
int lineno)
{
char *str;
int i;
for (i = 0; stack->head[i].item < MEMINFO_logical_end; i++)
;
if (relative_enum < 0 || relative_enum >= i) {
fprintf(stderr, "%s line %d: invalid relative_enum = %d, valid range = 0-%d\n"
, file, lineno, relative_enum, i-1);
return NULL;
}
str = Item_table[stack->head[relative_enum].item].type2str;
if (str[0]
&& (strcmp(typestr, str))) {
fprintf(stderr, "%s line %d: was %s, expected %s\n", file, lineno, typestr, str);
}
return &stack->head[relative_enum];
(void)info;
} // end: xtra_meminfo_val
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