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[tor-commits] [tor/master] Have the OOM handler also count the age the data in a stream buffer
commit 91ec6f7269bd7a5b73629f38e9779e84a0fb84f2
Author: Nick Mathewson <nickm@xxxxxxxxxxxxxx>
Date: Fri Nov 15 18:38:52 2013 -0500
Have the OOM handler also count the age the data in a stream buffer
---
src/or/buffers.c | 41 +++++++++++++++++++++++++++
src/or/buffers.h | 3 ++
src/or/circuitlist.c | 75 ++++++++++++++++++++++++++++++++++++++++----------
src/or/or.h | 3 ++
src/or/relay.c | 1 +
5 files changed, 108 insertions(+), 15 deletions(-)
diff --git a/src/or/buffers.c b/src/or/buffers.c
index 9be0476..4b176a8 100644
--- a/src/or/buffers.c
+++ b/src/or/buffers.c
@@ -68,6 +68,8 @@ typedef struct chunk_t {
size_t datalen; /**< The number of bytes stored in this chunk */
size_t memlen; /**< The number of usable bytes of storage in <b>mem</b>. */
char *data; /**< A pointer to the first byte of data stored in <b>mem</b>. */
+ uint32_t inserted_time; /**< Timestamp in truncated ms since epoch
+ * when this chunk was inserted. */
char mem[FLEXIBLE_ARRAY_MEMBER]; /**< The actual memory used for storage in
* this chunk. */
} chunk_t;
@@ -139,6 +141,9 @@ static chunk_freelist_t freelists[] = {
* could help with? */
static uint64_t n_freelist_miss = 0;
+/** DOCDOC */
+static size_t total_bytes_allocated_in_chunks = 0;
+
static void assert_freelist_ok(chunk_freelist_t *fl);
/** Return the freelist to hold chunks of size <b>alloc</b>, or NULL if
@@ -172,6 +177,8 @@ chunk_free_unchecked(chunk_t *chunk)
} else {
if (freelist)
++freelist->n_free;
+ tor_assert(total_bytes_allocated_in_chunks >= alloc);
+ total_bytes_allocated_in_chunks -= alloc;
tor_free(chunk);
}
}
@@ -200,6 +207,7 @@ chunk_new_with_alloc_size(size_t alloc)
else
++n_freelist_miss;
ch = tor_malloc(alloc);
+ total_bytes_allocated_in_chunks += alloc;
}
ch->next = NULL;
ch->datalen = 0;
@@ -211,6 +219,10 @@ chunk_new_with_alloc_size(size_t alloc)
static void
chunk_free_unchecked(chunk_t *chunk)
{
+ if (!chunk)
+ return;
+ tor_assert(total_bytes_allocated_in_chunks >= CHUNK_ALLOC_SIZE(chunk->memlen));
+ total_bytes_allocated_in_chunks -= CHUNK_ALLOC_SIZE(chunk->memlen);
tor_free(chunk);
}
static INLINE chunk_t *
@@ -221,6 +233,7 @@ chunk_new_with_alloc_size(size_t alloc)
ch->next = NULL;
ch->datalen = 0;
ch->memlen = CHUNK_SIZE_WITH_ALLOC(alloc);
+ total_bytes_allocated_in_chunks += alloc;
ch->data = &ch->mem[0];
return ch;
}
@@ -237,6 +250,7 @@ chunk_grow(chunk_t *chunk, size_t sz)
chunk = tor_realloc(chunk, CHUNK_ALLOC_SIZE(sz));
chunk->memlen = sz;
chunk->data = chunk->mem + offset;
+ total_bytes_allocated_in_chunks += (sz - chunk->memlen);
return chunk;
}
@@ -298,6 +312,8 @@ buf_shrink_freelists(int free_all)
*chp = NULL;
while (chunk) {
chunk_t *next = chunk->next;
+ tor_assert(total_bytes_allocated_in_chunks >= CHUNK_ALLOC_SIZE(chunk->memlen));
+ total_bytes_allocated_in_chunks -= CHUNK_ALLOC_SIZE(chunk->memlen);
tor_free(chunk);
chunk = next;
--n_to_free;
@@ -599,6 +615,7 @@ static chunk_t *
buf_add_chunk_with_capacity(buf_t *buf, size_t capacity, int capped)
{
chunk_t *chunk;
+ struct timeval now;
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) {
@@ -606,6 +623,10 @@ buf_add_chunk_with_capacity(buf_t *buf, size_t capacity, int capped)
} else {
chunk = chunk_new_with_alloc_size(preferred_chunk_size(capacity));
}
+
+ tor_gettimeofday_cached(&now);
+ chunk->inserted_time = (uint32_t)tv_to_msec(&now);
+
if (buf->tail) {
tor_assert(buf->head);
buf->tail->next = chunk;
@@ -618,6 +639,26 @@ buf_add_chunk_with_capacity(buf_t *buf, size_t capacity, int capped)
return chunk;
}
+/** Return the age of the oldest chunk in the buffer <b>buf</b>, in
+ * milliseconds. Requires the current time, in truncated milliseconds since
+ * the epoch, as its input <b>now</b>.
+ */
+uint32_t
+buf_get_oldest_chunk_timestamp(const buf_t *buf, uint32_t now)
+{
+ if (buf->head) {
+ return now - buf->head->inserted_time;
+ } else {
+ return 0;
+ }
+}
+
+size_t
+buf_get_total_allocation(void)
+{
+ return total_bytes_allocated_in_chunks;
+}
+
/** Read up to <b>at_most</b> bytes from the socket <b>fd</b> into
* <b>chunk</b> (which must be on <b>buf</b>). If we get an EOF, set
* *<b>reached_eof</b> to 1. Return -1 on error, 0 on eof or blocking,
diff --git a/src/or/buffers.h b/src/or/buffers.h
index a5886ad..677d68d 100644
--- a/src/or/buffers.h
+++ b/src/or/buffers.h
@@ -25,6 +25,9 @@ size_t buf_datalen(const buf_t *buf);
size_t buf_allocation(const buf_t *buf);
size_t buf_slack(const buf_t *buf);
+uint32_t buf_get_oldest_chunk_timestamp(const buf_t *buf, uint32_t now);
+size_t buf_get_total_allocation(void);
+
int read_to_buf(tor_socket_t s, size_t at_most, buf_t *buf, int *reached_eof,
int *socket_error);
int read_to_buf_tls(tor_tls_t *tls, size_t at_most, buf_t *buf);
diff --git a/src/or/circuitlist.c b/src/or/circuitlist.c
index 6250c11..27fe5ab 100644
--- a/src/or/circuitlist.c
+++ b/src/or/circuitlist.c
@@ -1409,20 +1409,63 @@ circuit_max_queued_cell_age(const circuit_t *c, uint32_t now)
return age;
}
-/** Temporary variable for circuits_compare_by_oldest_queued_cell_ This is a
- * kludge to work around the fact that qsort doesn't provide a way for
- * comparison functions to take an extra argument. */
-static uint32_t circcomp_now_tmp;
+/** DOCDOC*/
+static uint32_t
+circuit_get_streams_max_data_age(const edge_connection_t *stream, uint32_t now)
+{
+ uint32_t age = 0, age2;
+ for (; stream; stream = stream->next_stream) {
+ const connection_t *conn = TO_CONN(stream);
+ if (conn->outbuf) {
+ age2 = buf_get_oldest_chunk_timestamp(conn->outbuf, now);
+ if (age2 > age)
+ age = age2;
+ }
+ if (conn->inbuf) {
+ age2 = buf_get_oldest_chunk_timestamp(conn->inbuf, now);
+ if (age2 > age)
+ age = age2;
+ }
+ }
+
+ return age;
+}
+
+/** DOCDOC
+ */
+static uint32_t
+circuit_max_queued_data_age(const circuit_t *c, uint32_t now)
+{
+ if (CIRCUIT_IS_ORIGIN(c)) {
+ return circuit_get_streams_max_data_age(
+ TO_ORIGIN_CIRCUIT((circuit_t*)c)->p_streams, now);
+ } else {
+ return circuit_get_streams_max_data_age(
+ TO_OR_CIRCUIT((circuit_t*)c)->n_streams, now);
+ }
+}
+
+/** DATA */
+static uint32_t
+circuit_max_queued_item_age(const circuit_t *c, uint32_t now)
+{
+ uint32_t cell_age = circuit_max_queued_cell_age(c, now);
+ uint32_t data_age = circuit_max_queued_data_age(c, now);
+ if (cell_age > data_age)
+ return cell_age;
+ else
+ return data_age;
+}
-/** Helper to sort a list of circuit_t by age of oldest cell, in descending
- * order. Requires that circcomp_now_tmp is set correctly. */
+/** Helper to sort a list of circuit_t by age of oldest item, in descending
+ * order. */
static int
-circuits_compare_by_oldest_queued_cell_(const void **a_, const void **b_)
+circuits_compare_by_oldest_queued_item_(const void **a_, const void **b_)
{
const circuit_t *a = *a_;
const circuit_t *b = *b_;
- uint32_t age_a = circuit_max_queued_cell_age(a, circcomp_now_tmp);
- uint32_t age_b = circuit_max_queued_cell_age(b, circcomp_now_tmp);
+ uint32_t age_a = a->age_tmp;
+ uint32_t age_b = b->age_tmp;
if (age_a < age_b)
return 1;
@@ -1446,6 +1489,7 @@ circuits_handle_oom(size_t current_allocation)
size_t n_cells_removed=0, n_cells_to_remove;
int n_circuits_killed=0;
struct timeval now;
+ uint32_t now_ms;
log_notice(LD_GENERAL, "We're low on memory. Killing circuits with "
"over-long queues. (This behavior is controlled by "
"MaxMemInCellQueues.)");
@@ -1460,18 +1504,19 @@ circuits_handle_oom(size_t current_allocation)
n_cells_to_remove = CEIL_DIV(mem_to_recover, packed_cell_mem_cost());
}
+ tor_gettimeofday_cached(&now);
+ now_ms = (uint32_t)tv_to_msec(&now);
+
/* This algorithm itself assumes that you've got enough memory slack
* to actually run it. */
- for (circ = global_circuitlist; circ; circ = circ->next)
+ for (circ = global_circuitlist; circ; circ = circ->next) {
+ circ->age_tmp = circuit_max_queued_item_age(circ, now_ms);
smartlist_add(circlist, circ);
-
- /* Set circcomp_now_tmp so that the sort can work. */
- tor_gettimeofday_cached(&now);
- circcomp_now_tmp = (uint32_t)tv_to_msec(&now);
+ }
/* This is O(n log n); there are faster algorithms we could use instead.
* Let's hope this doesn't happen enough to be in the critical path. */
- smartlist_sort(circlist, circuits_compare_by_oldest_queued_cell_);
+ smartlist_sort(circlist, circuits_compare_by_oldest_queued_item_);
/* Okay, now the worst circuits are at the front of the list. Let's mark
* them, and reclaim their storage aggressively. */
diff --git a/src/or/or.h b/src/or/or.h
index 4622391..0dd47d0 100644
--- a/src/or/or.h
+++ b/src/or/or.h
@@ -2564,6 +2564,9 @@ typedef struct circuit_t {
* more. */
int deliver_window;
+ /** Temporary field used during circuits_handle_oom. */
+ uint32_t age_tmp;
+
/** For storage while n_conn is pending
* (state CIRCUIT_STATE_OR_WAIT). When defined, it is always
* length ONIONSKIN_CHALLENGE_LEN. */
diff --git a/src/or/relay.c b/src/or/relay.c
index a193ad8..042fc18 100644
--- a/src/or/relay.c
+++ b/src/or/relay.c
@@ -1998,6 +1998,7 @@ static int
cell_queues_check_size(void)
{
size_t alloc = total_cells_allocated * packed_cell_mem_cost();
+ alloc += buf_get_total_allocation();
if (alloc >= get_options()->MaxMemInCellQueues) {
circuits_handle_oom(alloc);
return 1;
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