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authorDave Barach <dave@barachs.net>2017-11-29 16:59:01 -0500
committerFlorin Coras <florin.coras@gmail.com>2017-11-30 03:32:37 +0000
commite9d9170b5546c3c5e768ba3ed26a525a16501c6e (patch)
tree720a594faaaf185410069bc2fb65423e23738eb2 /src/vppinfra/maplog.c
parent4adccc93763c8dab387cffa47454c2c0904a2128 (diff)
mmap-based fixed-size record double-buffered logger
Change-Id: I760b482b9de457bbb17de817db7079b57d3f5ec1 Signed-off-by: Dave Barach <dave@barachs.net>
Diffstat (limited to 'src/vppinfra/maplog.c')
-rw-r--r--src/vppinfra/maplog.c183
1 files changed, 183 insertions, 0 deletions
diff --git a/src/vppinfra/maplog.c b/src/vppinfra/maplog.c
new file mode 100644
index 00000000000..3664364a9e1
--- /dev/null
+++ b/src/vppinfra/maplog.c
@@ -0,0 +1,183 @@
+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <vppinfra/maplog.h>
+
+int
+clib_maplog_init (clib_maplog_main_t * mm, char *file_basename,
+ u64 file_size_in_bytes, u32 record_size_in_bytes)
+{
+ int i, fd;
+ int rv = 0;
+ u8 zero = 0;
+ u32 record_size_in_cache_lines;
+ u64 file_size_in_records;
+
+ /* Already initialized? */
+ if (mm->flags & CLIB_MAPLOG_FLAG_INIT)
+ return (-2);
+
+ memset (mm, 0, sizeof (*mm));
+
+ record_size_in_cache_lines =
+ (record_size_in_bytes + CLIB_CACHE_LINE_BYTES -
+ 1) / CLIB_CACHE_LINE_BYTES;
+
+ file_size_in_records = file_size_in_bytes
+ / (record_size_in_cache_lines * CLIB_CACHE_LINE_BYTES);
+
+ /* Round up file size in records to a power of 2, for speed... */
+ mm->log2_file_size_in_records = max_log2 (file_size_in_records);
+ file_size_in_records = 1ULL << (mm->log2_file_size_in_records);
+
+ file_size_in_bytes = file_size_in_records * record_size_in_cache_lines
+ * CLIB_CACHE_LINE_BYTES;
+
+ mm->file_basename = format (0, "%s", file_basename);
+ mm->file_size_in_records = file_size_in_records;
+ mm->flags |= CLIB_MAPLOG_FLAG_INIT;
+ mm->record_size_in_cachelines = record_size_in_cache_lines;
+
+ /* Map two files */
+ for (i = 0; i < 2; i++)
+ {
+ mm->filenames[i] = format (0, "%v_%d", mm->file_basename,
+ mm->current_file_index++);
+
+ fd = open ((char *) mm->filenames[i], O_CREAT | O_RDWR | O_TRUNC, 0600);
+ if (fd < 0)
+ {
+ rv = -3;
+ goto fail;
+ }
+
+ if (lseek (fd, file_size_in_bytes - 1, SEEK_SET) == (off_t) - 1)
+ {
+ rv = -4;
+ goto fail;
+ }
+ if (write (fd, &zero, 1) != 1)
+ {
+ rv = -5;
+ goto fail;
+ }
+
+ mm->file_baseva[i] = mmap (0, file_size_in_bytes,
+ PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+ if (mm->file_baseva[i] == (u8 *) MAP_FAILED)
+ {
+ clib_unix_warning ("mmap");
+ goto fail;
+ }
+ (void) close (fd);
+ }
+ return rv;
+
+fail:
+ if (fd)
+ (void) close (fd);
+
+ for (i = 0; i < 2; i++)
+ {
+ if (mm->file_baseva[i])
+ (void) munmap ((u8 *) mm->file_baseva[i], file_size_in_bytes);
+ }
+ return rv;
+}
+
+u8 *
+_clib_maplog_get_entry_slowpath (clib_maplog_main_t * mm, u64 my_record_index)
+{
+ int fd;
+ u8 *rv;
+ u8 zero = 0;
+ u32 unmap_index = (mm->current_file_index) & 1;
+ u64 file_size_in_bytes = mm->file_size_in_records
+ * mm->record_size_in_cachelines * CLIB_CACHE_LINE_BYTES;
+
+ (void) munmap ((u8 *) mm->file_baseva[unmap_index], file_size_in_bytes);
+ vec_reset_length (mm->filenames[unmap_index]);
+
+ mm->filenames[unmap_index] = format (mm->filenames[unmap_index],
+ "%v_%d", mm->file_basename,
+ mm->current_file_index++);
+
+ fd = open ((char *) mm->filenames[unmap_index],
+ O_CREAT | O_RDWR | O_TRUNC, 0600);
+ /* $$$ this is not real error recovery... */
+ if (fd < 0)
+ {
+ clib_unix_warning ("creat");
+ abort ();
+ }
+
+ if (lseek (fd, file_size_in_bytes - 1, SEEK_SET) == (off_t) - 1)
+ {
+ clib_unix_warning ("lseek");
+ abort ();
+ }
+ if (write (fd, &zero, 1) != 1)
+ {
+ clib_unix_warning ("set-size write");
+ abort ();
+ }
+
+ mm->file_baseva[unmap_index] =
+ mmap (0, file_size_in_bytes, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+ if (mm->file_baseva[unmap_index] == (u8 *) MAP_FAILED)
+ {
+ clib_unix_warning ("mmap");
+ abort ();
+ }
+ (void) close (fd);
+
+ rv = (u8 *)
+ mm->file_baseva[(my_record_index >> mm->log2_file_size_in_records) & 1] +
+ (my_record_index & (mm->file_size_in_records - 1))
+ * mm->record_size_in_cachelines * CLIB_CACHE_LINE_BYTES;
+
+ return rv;
+}
+
+void
+clib_maplog_close (clib_maplog_main_t * mm)
+{
+ int i;
+ u64 file_size_in_bytes;
+
+ if (!(mm->flags & CLIB_MAPLOG_FLAG_INIT))
+ return;
+
+ file_size_in_bytes =
+ mm->file_size_in_records * mm->record_size_in_cachelines *
+ CLIB_CACHE_LINE_BYTES;
+
+ for (i = 0; i < 2; i++)
+ {
+ (void) munmap ((u8 *) mm->file_baseva[i], file_size_in_bytes);
+ vec_free (mm->filenames[i]);
+ }
+
+ vec_free (mm->file_basename);
+ memset (mm, 0, sizeof (*mm));
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */