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r15745@tombo: nickm | 2007-12-29 00:15:17 -0500

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Try even harder not to allocate chunks bigger than MAX_CHUNK_ALLOC.


svn:r13003
This commit is contained in:
Nick Mathewson 2007-12-29 05:16:30 +00:00
parent bd32982c77
commit f4f5dc4aca
1 changed files with 28 additions and 27 deletions
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55
src/or/buffers.c
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@ -119,7 +119,8 @@ typedef struct chunk_freelist_t {
/**XXXX020 tune these values. And all allocation sizes, really. */
static chunk_freelist_t freelists[] = {
FL(256, 1024, 16), FL(512, 1024, 16), FL(1024, 512, 8), FL(4096, 256, 8),
FL(8192, 128, 4), FL(16384, 64, 4), FL(0, 0, 0)
FL(8192, 128, 4), FL(16384, 64, 4), FL(32768, 32, 2), FL(65536, 16, 2),
FL(0, 0, 0)
};
#undef FL
static uint64_t n_freelist_miss = 0;
@ -492,16 +493,19 @@ buf_free(buf_t *buf)
tor_free(buf);
}
/** Append a new chunk with enough capacity to hold <b>cap</b> bytes to the
* tail of <b>buf</b>. */
/** Append a new chunk with enough capacity to hold <b>capacity</b> bytes to the
* tail of <b>buf</b>. If <b>capped</b>, don't allocate a chunk bigger than
* MAX_CHUNK_ALLOC. */
static chunk_t *
buf_add_chunk_with_capacity(buf_t *buf, size_t cap)
buf_add_chunk_with_capacity(buf_t *buf, size_t capacity, int capped)
{
chunk_t *chunk;
if (CHUNK_ALLOC_SIZE(cap) < buf->default_chunk_size) {
if (CHUNK_ALLOC_SIZE(capacity) < buf->default_chunk_size) {
chunk = chunk_new_with_alloc_size(buf->default_chunk_size);
} else if (capped && CHUNK_ALLOC_SIZE(capacity) > MAX_CHUNK_ALLOC) {
chunk = chunk_new_with_alloc_size(MAX_CHUNK_ALLOC);
} else {
chunk = chunk_new_with_alloc_size(preferred_chunk_size(cap));
chunk = chunk_new_with_alloc_size(preferred_chunk_size(capacity));
}
if (buf->tail) {
tor_assert(buf->head);
@ -580,12 +584,13 @@ read_to_buf(int s, size_t at_most, buf_t *buf, int *reached_eof)
tor_assert(reached_eof);
tor_assert(s >= 0);
while (at_most) {
size_t readlen = at_most;
while (at_most > total_read) {
size_t readlen = at_most - total_read;
chunk_t *chunk;
if (!buf->tail || CHUNK_REMAINING_CAPACITY(buf->tail) < MIN_READ_LEN) {
chunk = buf_add_chunk_with_capacity(buf, at_most);
tor_assert(CHUNK_REMAINING_CAPACITY(chunk) >= readlen);
chunk = buf_add_chunk_with_capacity(buf, at_most, 1);
if (readlen > chunk->memlen)
readlen = chunk->memlen;
} else {
size_t cap = CHUNK_REMAINING_CAPACITY(buf->tail);
chunk = buf->tail;
@ -632,12 +637,13 @@ read_to_buf_tls(tor_tls_t *tls, size_t at_most, buf_t *buf)
size_t total_read = 0;
check();
while (at_most) {
size_t readlen = at_most;
while (at_most > total_read) {
size_t readlen = at_most - total_read;
chunk_t *chunk;
if (!buf->tail || CHUNK_REMAINING_CAPACITY(buf->tail) < MIN_READ_LEN) {
chunk = buf_add_chunk_with_capacity(buf, at_most);
tor_assert(CHUNK_REMAINING_CAPACITY(chunk) >= readlen);
chunk = buf_add_chunk_with_capacity(buf, at_most, 1);
if (readlen > chunk->memlen)
readlen = chunk->memlen;
} else {
size_t cap = CHUNK_REMAINING_CAPACITY(buf->tail);
chunk = buf->tail;
@ -809,8 +815,12 @@ write_to_buf(const char *string, size_t string_len, buf_t *buf)
return buf->datalen;
check();
if (buf->tail && CHUNK_REMAINING_CAPACITY(buf->tail)) {
size_t copy = CHUNK_REMAINING_CAPACITY(buf->tail);
while (string_len) {
size_t copy;
if (!buf->tail || !CHUNK_REMAINING_CAPACITY(buf->tail))
buf_add_chunk_with_capacity(buf, string_len, 1);
copy = CHUNK_REMAINING_CAPACITY(buf->tail);
if (copy > string_len)
copy = string_len;
memcpy(CHUNK_WRITE_PTR(buf->tail), string, copy);
@ -820,13 +830,6 @@ write_to_buf(const char *string, size_t string_len, buf_t *buf)
buf->tail->datalen += copy;
}
if (string_len) {
chunk_t *newchunk = buf_add_chunk_with_capacity(buf, string_len);
memcpy(newchunk->data, string, string_len);
newchunk->datalen = string_len;
buf->datalen += string_len;
}
check();
return buf->datalen;
}
@ -1460,9 +1463,7 @@ write_to_buf_zlib(buf_t *buf, tor_zlib_state_t *state,
int need_new_chunk = 0;
if (!buf->tail || ! CHUNK_REMAINING_CAPACITY(buf->tail)) {
size_t cap = data_len / 4;
if (cap > MAX_CHUNK_ALLOC) /* Add a function for this. */
cap = MAX_CHUNK_ALLOC;
buf_add_chunk_with_capacity(buf, cap);
buf_add_chunk_with_capacity(buf, cap, 1);
}
next = CHUNK_WRITE_PTR(buf->tail);
avail = old_avail = CHUNK_REMAINING_CAPACITY(buf->tail);
@ -1487,7 +1488,7 @@ write_to_buf_zlib(buf_t *buf, tor_zlib_state_t *state,
buf->datalen += old_avail - avail;
buf->tail->datalen += old_avail - avail;
if (need_new_chunk) {
buf_add_chunk_with_capacity(buf, data_len/4);
buf_add_chunk_with_capacity(buf, data_len/4, 1);
}
} while (!over);