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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2014 CohortFS, LLC
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#ifndef XIO_POOL_H
#define XIO_POOL_H
#include <atomic>
#include <vector>
#include <cstdlib>
#include <cstring>
#include <cstdint>
extern "C" {
#include "libxio.h"
}
#include "common/likely.h"
static inline int xpool_alloc(struct xio_mempool *pool, uint64_t size,
struct xio_reg_mem* mp);
static inline void xpool_free(uint64_t size, struct xio_reg_mem* mp);
class XioPool
{
private:
struct xio_mempool *handle;
public:
static bool trace_mempool;
static bool trace_msgcnt;
static const int MB = 8;
struct xio_piece {
struct xio_reg_mem mp[1];
struct xio_piece *next;
int s;
char payload[MB];
} *first;
explicit XioPool(struct xio_mempool *_handle) :
handle(_handle), first(0)
{
}
~XioPool()
{
struct xio_piece *p;
while ((p = first)) {
first = p->next;
if (unlikely(trace_mempool)) {
memset(p->payload, 0xcf, p->s); // guard bytes
}
xpool_free(sizeof(struct xio_piece)+(p->s)-MB, p->mp);
}
}
void *alloc(size_t _s)
{
void *r;
struct xio_reg_mem mp[1];
struct xio_piece *x;
int e = xpool_alloc(handle, (sizeof(struct xio_piece)-MB) + _s, mp);
if (e) {
r = 0;
} else {
x = reinterpret_cast<struct xio_piece *>(mp->addr);
*x->mp = *mp;
x->next = first;
x->s = _s;
first = x;
r = x->payload;
}
return r;
}
};
class XioPoolStats {
private:
enum pool_sizes {
SLAB_64 = 0,
SLAB_256,
SLAB_1024,
SLAB_PAGE,
SLAB_MAX,
SLAB_OVERFLOW,
NUM_SLABS,
};
std::atomic<unsigned> ctr_set[NUM_SLABS] = {};
std::atomic<unsigned> msg_cnt = { 0 }; // send msgs
std::atomic<unsigned> hook_cnt = { 0 }; // recv msgs
public:
void dump(const char* tag, uint64_t serial);
void inc(uint64_t size) {
if (size <= 64) {
(ctr_set[SLAB_64])++;
return;
}
if (size <= 256) {
(ctr_set[SLAB_256])++;
return;
}
if (size <= 1024) {
(ctr_set[SLAB_1024])++;
return;
}
if (size <= 8192) {
(ctr_set[SLAB_PAGE])++;
return;
}
(ctr_set[SLAB_MAX])++;
}
void dec(uint64_t size) {
if (size <= 64) {
(ctr_set[SLAB_64])--;
return;
}
if (size <= 256) {
(ctr_set[SLAB_256])--;
return;
}
if (size <= 1024) {
(ctr_set[SLAB_1024])--;
return;
}
if (size <= 8192) {
(ctr_set[SLAB_PAGE])--;
return;
}
(ctr_set[SLAB_MAX])--;
}
void inc_overflow() { ctr_set[SLAB_OVERFLOW]++; }
void dec_overflow() { ctr_set[SLAB_OVERFLOW]--; }
void inc_msgcnt() {
if (unlikely(XioPool::trace_msgcnt)) {
msg_cnt++;
}
}
void dec_msgcnt() {
if (unlikely(XioPool::trace_msgcnt)) {
msg_cnt--;
}
}
void inc_hookcnt() {
if (unlikely(XioPool::trace_msgcnt)) {
hook_cnt++;
}
}
void dec_hookcnt() {
if (unlikely(XioPool::trace_msgcnt)) {
hook_cnt--;
}
}
};
extern XioPoolStats xp_stats;
static inline int xpool_alloc(struct xio_mempool *pool, uint64_t size,
struct xio_reg_mem* mp)
{
// try to allocate from the xio pool
int r = xio_mempool_alloc(pool, size, mp);
if (r == 0) {
if (unlikely(XioPool::trace_mempool))
xp_stats += size;
return 0;
}
// fall back to malloc on errors
mp->addr = malloc(size);
ceph_assert(mp->addr);
mp->length = 0;
if (unlikely(XioPool::trace_mempool))
xp_stats.inc_overflow();
return 0;
}
static inline void xpool_free(uint64_t size, struct xio_reg_mem* mp)
{
if (mp->length) {
if (unlikely(XioPool::trace_mempool))
xp_stats -= size;
xio_mempool_free(mp);
} else { // from malloc
if (unlikely(XioPool::trace_mempool))
xp_stats.dec_overflow();
free(mp->addr);
}
}
#define xpool_inc_msgcnt() \
do { xp_stats.inc_msgcnt(); } while (0)
#define xpool_dec_msgcnt() \
do { xp_stats.dec_msgcnt(); } while (0)
#define xpool_inc_hookcnt() \
do { xp_stats.inc_hookcnt(); } while (0)
#define xpool_dec_hookcnt() \
do { xp_stats.dec_hookcnt(); } while (0)
#endif /* XIO_POOL_H */
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