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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-14 13:40:54 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-14 13:40:54 +0000
commit317c0644ccf108aa23ef3fd8358bd66c2840bfc0 (patch)
treec417b3d25c86b775989cb5ac042f37611b626c8a /src/childinfo.c
parentInitial commit. (diff)
downloadredis-317c0644ccf108aa23ef3fd8358bd66c2840bfc0.tar.xz
redis-317c0644ccf108aa23ef3fd8358bd66c2840bfc0.zip
Adding upstream version 5:7.2.4.upstream/5%7.2.4
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r--src/childinfo.c183
1 files changed, 183 insertions, 0 deletions
diff --git a/src/childinfo.c b/src/childinfo.c
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+++ b/src/childinfo.c
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+/*
+ * Copyright (c) 2016, Salvatore Sanfilippo <antirez at gmail dot com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * * Neither the name of Redis nor the names of its contributors may be used
+ * to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "server.h"
+#include <unistd.h>
+#include <fcntl.h>
+
+typedef struct {
+ size_t keys;
+ size_t cow;
+ monotime cow_updated;
+ double progress;
+ childInfoType information_type; /* Type of information */
+} child_info_data;
+
+/* Open a child-parent channel used in order to move information about the
+ * RDB / AOF saving process from the child to the parent (for instance
+ * the amount of copy on write memory used) */
+void openChildInfoPipe(void) {
+ if (anetPipe(server.child_info_pipe, O_NONBLOCK, 0) == -1) {
+ /* On error our two file descriptors should be still set to -1,
+ * but we call anyway closeChildInfoPipe() since can't hurt. */
+ closeChildInfoPipe();
+ } else {
+ server.child_info_nread = 0;
+ }
+}
+
+/* Close the pipes opened with openChildInfoPipe(). */
+void closeChildInfoPipe(void) {
+ if (server.child_info_pipe[0] != -1 ||
+ server.child_info_pipe[1] != -1)
+ {
+ close(server.child_info_pipe[0]);
+ close(server.child_info_pipe[1]);
+ server.child_info_pipe[0] = -1;
+ server.child_info_pipe[1] = -1;
+ server.child_info_nread = 0;
+ }
+}
+
+/* Send save data to parent. */
+void sendChildInfoGeneric(childInfoType info_type, size_t keys, double progress, char *pname) {
+ if (server.child_info_pipe[1] == -1) return;
+
+ static monotime cow_updated = 0;
+ static uint64_t cow_update_cost = 0;
+ static size_t cow = 0;
+ static size_t peak_cow = 0;
+ static size_t update_count = 0;
+ static unsigned long long sum_cow = 0;
+
+ child_info_data data = {0}; /* zero everything, including padding to satisfy valgrind */
+
+ /* When called to report current info, we need to throttle down CoW updates as they
+ * can be very expensive. To do that, we measure the time it takes to get a reading
+ * and schedule the next reading to happen not before time*CHILD_COW_COST_FACTOR
+ * passes. */
+
+ monotime now = getMonotonicUs();
+ if (info_type != CHILD_INFO_TYPE_CURRENT_INFO ||
+ !cow_updated ||
+ now - cow_updated > cow_update_cost * CHILD_COW_DUTY_CYCLE)
+ {
+ cow = zmalloc_get_private_dirty(-1);
+ cow_updated = getMonotonicUs();
+ cow_update_cost = cow_updated - now;
+ if (cow > peak_cow) peak_cow = cow;
+ sum_cow += cow;
+ update_count++;
+
+ int cow_info = (info_type != CHILD_INFO_TYPE_CURRENT_INFO);
+ if (cow || cow_info) {
+ serverLog(cow_info ? LL_NOTICE : LL_VERBOSE,
+ "Fork CoW for %s: current %zu MB, peak %zu MB, average %llu MB",
+ pname, cow>>20, peak_cow>>20, (sum_cow/update_count)>>20);
+ }
+ }
+
+ data.information_type = info_type;
+ data.keys = keys;
+ data.cow = cow;
+ data.cow_updated = cow_updated;
+ data.progress = progress;
+
+ ssize_t wlen = sizeof(data);
+
+ if (write(server.child_info_pipe[1], &data, wlen) != wlen) {
+ /* Failed writing to parent, it could have been killed, exit. */
+ serverLog(LL_WARNING,"Child failed reporting info to parent, exiting. %s", strerror(errno));
+ exitFromChild(1);
+ }
+}
+
+/* Update Child info. */
+void updateChildInfo(childInfoType information_type, size_t cow, monotime cow_updated, size_t keys, double progress) {
+ if (cow > server.stat_current_cow_peak) server.stat_current_cow_peak = cow;
+
+ if (information_type == CHILD_INFO_TYPE_CURRENT_INFO) {
+ server.stat_current_cow_bytes = cow;
+ server.stat_current_cow_updated = cow_updated;
+ server.stat_current_save_keys_processed = keys;
+ if (progress != -1) server.stat_module_progress = progress;
+ } else if (information_type == CHILD_INFO_TYPE_AOF_COW_SIZE) {
+ server.stat_aof_cow_bytes = server.stat_current_cow_peak;
+ } else if (information_type == CHILD_INFO_TYPE_RDB_COW_SIZE) {
+ server.stat_rdb_cow_bytes = server.stat_current_cow_peak;
+ } else if (information_type == CHILD_INFO_TYPE_MODULE_COW_SIZE) {
+ server.stat_module_cow_bytes = server.stat_current_cow_peak;
+ }
+}
+
+/* Read child info data from the pipe.
+ * if complete data read into the buffer,
+ * data is stored into *buffer, and returns 1.
+ * otherwise, the partial data is left in the buffer, waiting for the next read, and returns 0. */
+int readChildInfo(childInfoType *information_type, size_t *cow, monotime *cow_updated, size_t *keys, double* progress) {
+ /* We are using here a static buffer in combination with the server.child_info_nread to handle short reads */
+ static child_info_data buffer;
+ ssize_t wlen = sizeof(buffer);
+
+ /* Do not overlap */
+ if (server.child_info_nread == wlen) server.child_info_nread = 0;
+
+ int nread = read(server.child_info_pipe[0], (char *)&buffer + server.child_info_nread, wlen - server.child_info_nread);
+ if (nread > 0) {
+ server.child_info_nread += nread;
+ }
+
+ /* We have complete child info */
+ if (server.child_info_nread == wlen) {
+ *information_type = buffer.information_type;
+ *cow = buffer.cow;
+ *cow_updated = buffer.cow_updated;
+ *keys = buffer.keys;
+ *progress = buffer.progress;
+ return 1;
+ } else {
+ return 0;
+ }
+}
+
+/* Receive info data from child. */
+void receiveChildInfo(void) {
+ if (server.child_info_pipe[0] == -1) return;
+
+ size_t cow;
+ monotime cow_updated;
+ size_t keys;
+ double progress;
+ childInfoType information_type;
+
+ /* Drain the pipe and update child info so that we get the final message. */
+ while (readChildInfo(&information_type, &cow, &cow_updated, &keys, &progress)) {
+ updateChildInfo(information_type, cow, cow_updated, keys, progress);
+ }
+}