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/*
* Buffer management functions.
*
* Copyright 2000-2012 Willy Tarreau <w@1wt.eu>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include <haproxy/api.h>
#include <haproxy/cfgparse.h>
#include <haproxy/dynbuf.h>
#include <haproxy/global.h>
#include <haproxy/list.h>
#include <haproxy/pool.h>
#include <haproxy/tools.h>
struct pool_head *pool_head_buffer __read_mostly;
/* perform minimal initializations, report 0 in case of error, 1 if OK. */
int init_buffer()
{
void *buffer;
int thr;
int done;
int i;
pool_head_buffer = create_pool("buffer", global.tune.bufsize, MEM_F_SHARED|MEM_F_EXACT);
if (!pool_head_buffer)
return 0;
/* make sure any change to the queues assignment isn't overlooked */
BUG_ON(DB_PERMANENT - DB_UNLIKELY - 1 != DYNBUF_NBQ);
BUG_ON(DB_MUX_RX_Q < DB_SE_RX_Q || DB_MUX_RX_Q >= DYNBUF_NBQ);
BUG_ON(DB_SE_RX_Q < DB_CHANNEL_Q || DB_SE_RX_Q >= DYNBUF_NBQ);
BUG_ON(DB_CHANNEL_Q < DB_MUX_TX_Q || DB_CHANNEL_Q >= DYNBUF_NBQ);
BUG_ON(DB_MUX_TX_Q >= DYNBUF_NBQ);
for (thr = 0; thr < MAX_THREADS; thr++) {
for (i = 0; i < DYNBUF_NBQ; i++)
LIST_INIT(&ha_thread_ctx[thr].buffer_wq[i]);
ha_thread_ctx[thr].bufq_map = 0;
}
/* The reserved buffer is what we leave behind us. Thus we always need
* at least one extra buffer in minavail otherwise we'll end up waking
* up tasks with no memory available, causing a lot of useless wakeups.
* That means that we always want to have at least 3 buffers available
* (2 for current session, one for next session that might be needed to
* release a server connection).
*/
pool_head_buffer->minavail = MAX(global.tune.reserved_bufs, 3);
if (global.tune.buf_limit)
pool_head_buffer->limit = global.tune.buf_limit;
for (done = 0; done < pool_head_buffer->minavail - 1; done++) {
buffer = pool_alloc_nocache(pool_head_buffer, init_buffer);
if (!buffer)
return 0;
pool_free(pool_head_buffer, buffer);
}
return 1;
}
/*
* Dumps part or all of a buffer.
*/
void buffer_dump(FILE *o, struct buffer *b, int from, int to)
{
fprintf(o, "Dumping buffer %p\n", b);
fprintf(o, " orig=%p size=%u head=%u tail=%u data=%u\n",
b_orig(b), (unsigned int)b_size(b), (unsigned int)b_head_ofs(b), (unsigned int)b_tail_ofs(b), (unsigned int)b_data(b));
fprintf(o, "Dumping contents from byte %d to byte %d\n", from, to);
fprintf(o, " 0 1 2 3 4 5 6 7 8 9 a b c d e f\n");
/* dump hexa */
while (from < to) {
int i;
fprintf(o, " %04x: ", from);
for (i = 0; ((from + i) < to) && (i < 16) ; i++) {
fprintf(o, "%02x ", (unsigned char)b_orig(b)[from + i]);
if (i == 7)
fprintf(o, "- ");
}
if (to - from < 16) {
int j = 0;
for (j = 0; j < from + 16 - to; j++)
fprintf(o, " ");
if (j > 8)
fprintf(o, " ");
}
fprintf(o, " ");
for (i = 0; (from + i < to) && (i < 16) ; i++) {
fprintf(o, "%c", isprint((unsigned char)b_orig(b)[from + i]) ? b_orig(b)[from + i] : '.') ;
if ((i == 15) && ((from + i) != to-1))
fprintf(o, "\n");
}
from += i;
}
fprintf(o, "\n--\n");
fflush(o);
}
/* see offer_buffers() for details */
void __offer_buffers(void *from, unsigned int count)
{
struct buffer_wait *wait, *wait_back;
int q;
/* For now, we consider that all objects need 1 buffer, so we can stop
* waking up them once we have enough of them to eat all the available
* buffers. Note that we don't really know if they are streams or just
* other tasks, but that's a rough estimate. Similarly, for each cached
* event we'll need 1 buffer.
*/
for (q = 0; q < DYNBUF_NBQ; q++) {
if (!(th_ctx->bufq_map & (1 << q)))
continue;
BUG_ON_HOT(LIST_ISEMPTY(&th_ctx->buffer_wq[q]));
list_for_each_entry_safe(wait, wait_back, &th_ctx->buffer_wq[q], list) {
if (!count)
break;
if (wait->target == from || !wait->wakeup_cb(wait->target))
continue;
LIST_DEL_INIT(&wait->list);
count--;
}
if (LIST_ISEMPTY(&th_ctx->buffer_wq[q]))
th_ctx->bufq_map &= ~(1 << q);
}
}
/* config parser for global "tune.buffers.limit", accepts a number >= 0 */
static int cfg_parse_tune_buffers_limit(char **args, int section_type, struct proxy *curpx,
const struct proxy *defpx, const char *file, int line,
char **err)
{
int limit;
if (too_many_args(1, args, err, NULL))
return -1;
limit = atoi(args[1]);
if (limit < 0) {
memprintf(err, "'%s' expects a non-negative number but got '%s'.", args[0], args[1]);
return -1;
}
global.tune.buf_limit = limit;
if (global.tune.buf_limit) {
if (global.tune.buf_limit < 3)
global.tune.buf_limit = 3;
}
return 0;
}
/* config parser for global "tune.buffers.reserve", accepts a number >= 0 */
static int cfg_parse_tune_buffers_reserve(char **args, int section_type, struct proxy *curpx,
const struct proxy *defpx, const char *file, int line,
char **err)
{
int reserve;
if (too_many_args(1, args, err, NULL))
return -1;
reserve = atoi(args[1]);
if (reserve < 0) {
memprintf(err, "'%s' expects a non-negative number but got '%s'.", args[0], args[1]);
return -1;
}
global.tune.reserved_bufs = reserve;
return 0;
}
/* allocate emergency buffers for the thread */
static int alloc_emergency_buffers_per_thread(void)
{
int idx;
th_ctx->emergency_bufs_left = global.tune.reserved_bufs;
th_ctx->emergency_bufs = calloc(global.tune.reserved_bufs, sizeof(*th_ctx->emergency_bufs));
if (!th_ctx->emergency_bufs)
return 0;
for (idx = 0; idx < global.tune.reserved_bufs; idx++) {
/* reserved bufs are not subject to the limit, so we must push it */
if (_HA_ATOMIC_LOAD(&pool_head_buffer->limit))
_HA_ATOMIC_INC(&pool_head_buffer->limit);
th_ctx->emergency_bufs[idx] = pool_alloc_flag(pool_head_buffer, POOL_F_NO_POISON | POOL_F_NO_FAIL);
if (!th_ctx->emergency_bufs[idx])
return 0;
}
return 1;
}
/* frees the thread's emergency buffers */
static void free_emergency_buffers_per_thread(void)
{
int idx;
if (th_ctx->emergency_bufs) {
for (idx = 0; idx < global.tune.reserved_bufs; idx++)
pool_free(pool_head_buffer, th_ctx->emergency_bufs[idx]);
}
ha_free(&th_ctx->emergency_bufs);
}
/* config keyword parsers */
static struct cfg_kw_list cfg_kws = {ILH, {
{ CFG_GLOBAL, "tune.buffers.limit", cfg_parse_tune_buffers_limit },
{ CFG_GLOBAL, "tune.buffers.reserve", cfg_parse_tune_buffers_reserve },
{ 0, NULL, NULL }
}};
INITCALL1(STG_REGISTER, cfg_register_keywords, &cfg_kws);
REGISTER_PER_THREAD_ALLOC(alloc_emergency_buffers_per_thread);
REGISTER_PER_THREAD_FREE(free_emergency_buffers_per_thread);
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* End:
*/
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