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authorDave Barach <dave@barachs.net>2018-03-22 10:54:45 -0400
committerDamjan Marion <dmarion.lists@gmail.com>2018-03-22 22:36:20 +0000
commit6ddede72126a8e5854908b6fcf4c80f55bf450cc (patch)
tree9d99aaa2f6437a7676a656ba9edbc6e0097ea376 /src/vppinfra/maplog.c
parentf3639d00aa1ccb37987dc90f974540a5c70187de (diff)
Add circular logging
Change-Id: Ide8bf41e24a427643a3a17b1c9089993790c12a6 Signed-off-by: Dave Barach <dave@barachs.net>
Diffstat (limited to 'src/vppinfra/maplog.c')
-rw-r--r--src/vppinfra/maplog.c58
1 files changed, 48 insertions, 10 deletions
diff --git a/src/vppinfra/maplog.c b/src/vppinfra/maplog.c
index deb07aa9b76..1900aa8f03b 100644
--- a/src/vppinfra/maplog.c
+++ b/src/vppinfra/maplog.c
@@ -27,7 +27,7 @@
int
clib_maplog_init (clib_maplog_init_args_t * a)
{
- int i, fd;
+ int i, fd, limit;
int rv = 0;
u8 zero = 0;
u32 record_size_in_cache_lines;
@@ -54,7 +54,6 @@ clib_maplog_init (clib_maplog_init_args_t * a)
/* 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);
-
a->file_size_in_bytes = file_size_in_records * record_size_in_cache_lines
* CLIB_CACHE_LINE_BYTES;
@@ -68,9 +67,19 @@ clib_maplog_init (clib_maplog_init_args_t * a)
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;
+ limit = 2;
+ if (a->maplog_is_circular)
+ {
+ mm->log2_file_size_in_records = 63;
+ mm->flags |= CLIB_MAPLOG_FLAG_CIRCULAR;
+ limit = 1;
+ }
- /* Map two files */
- for (i = 0; i < 2; i++)
+ /*
+ * Map the one and only file for a circular log,
+ * two files for a normal log.
+ */
+ for (i = 0; i < limit; i++)
{
mm->filenames[i] = format (0, "%v_%d", mm->file_basename,
mm->current_file_index++);
@@ -117,6 +126,7 @@ clib_maplog_init (clib_maplog_init_args_t * a)
h->file_size_in_records = file_size_in_records;
h->number_of_records = ~0ULL;
h->number_of_files = ~0ULL;
+ h->maplog_flag_circular = a->maplog_is_circular;
memcpy (h->file_basename, mm->file_basename, vec_len (mm->file_basename));
mm->header_filename = format (0, "%v_header", mm->file_basename);
@@ -143,7 +153,7 @@ fail:
if (fd >= 0)
(void) close (fd);
- for (i = 0; i < 2; i++)
+ for (i = 0; i < limit; i++)
{
if (mm->file_baseva[i])
(void) munmap ((u8 *) mm->file_baseva[i], a->file_size_in_bytes);
@@ -171,6 +181,9 @@ _clib_maplog_get_entry_slowpath (clib_maplog_main_t * mm, u64 my_record_index)
u64 file_size_in_bytes = mm->file_size_in_records
* mm->record_size_in_cachelines * CLIB_CACHE_LINE_BYTES;
+ /* This should never happen */
+ ASSERT ((mm->flags & CLIB_MAPLOG_FLAG_CIRCULAR) == 0);
+
/*
* Kill some time by calling format before we make the previous log
* segment disappear. Obviously it won't do to call clib_maplog_get_entry(),
@@ -256,6 +269,7 @@ clib_maplog_update_header (clib_maplog_main_t * mm)
/* Fix the header... */
h->number_of_records = mm->next_record_index;
h->number_of_files = mm->current_file_index;
+ h->maplog_flag_wrapped = (mm->flags & CLIB_MAPLOG_FLAG_WRAPPED) ? 1 : 0;
/* Back to the beginning of the log header... */
if (lseek (fd, 0, SEEK_SET) < 0)
@@ -284,7 +298,7 @@ out:
void
clib_maplog_close (clib_maplog_main_t * mm)
{
- int i;
+ int i, limit;
u64 file_size_in_bytes;
if (!(mm->flags & CLIB_MAPLOG_FLAG_INIT))
@@ -296,8 +310,10 @@ clib_maplog_close (clib_maplog_main_t * mm)
mm->file_size_in_records * mm->record_size_in_cachelines *
CLIB_CACHE_LINE_BYTES;
+ limit = (mm->flags & CLIB_MAPLOG_FLAG_CIRCULAR) ? 1 : 2;
+
/* unmap current + next segments */
- for (i = 0; i < 2; i++)
+ for (i = 0; i < limit; i++)
{
(void) munmap ((u8 *) mm->file_baseva[i], file_size_in_bytes);
vec_free (mm->filenames[i]);
@@ -324,13 +340,15 @@ format_maplog_header (u8 * s, va_list * args)
if (!verbose)
goto brief;
s = format (s, "basename %s ", h->file_basename);
- s = format (s, "log ver %d.%d.%d app id %u ver %d.%d.%d\n",
+ s = format (s, "log ver %d.%d.%d app id %u ver %d.%d.%d %s %s\n",
h->maplog_major_version,
h->maplog_minor_version,
h->maplog_patch_version,
h->application_id,
h->application_major_version,
- h->application_minor_version, h->application_patch_version);
+ h->application_minor_version, h->application_patch_version,
+ h->maplog_flag_circular ? "circular" : "linear",
+ h->maplog_flag_wrapped ? "wrapped" : "not wrapped");
s = format (s, " records are %d %d-byte cachelines\n",
h->record_size_in_cachelines, h->cacheline_size);
s = format (s, " files are %lld records long, %lld files\n",
@@ -427,7 +445,27 @@ clib_maplog_process (char *file_basename, void *fp_arg)
records_this_file = (records_left > h->file_size_in_records) ?
h->file_size_in_records : records_left;
- (*fp) (h, file_baseva, records_this_file);
+ /*
+ * Normal log, or a circular non-wrapped log, or a circular
+ * wrapped log which happens to be exactly linear
+ */
+ if (h->maplog_flag_circular == 0 || h->maplog_flag_wrapped == 0 ||
+ ((h->number_of_records % h->file_size_in_records) == 0))
+ (*fp) (h, file_baseva, records_this_file);
+ else
+ {
+ /* "Normal" wrapped circular log */
+ u64 first_chunk_record_index = h->number_of_records &
+ (h->file_size_in_records - 1);
+ u64 first_chunk_number_of_records = records_this_file -
+ first_chunk_record_index;
+ u8 *chunk_baseva = file_baseva +
+ first_chunk_record_index * h->record_size_in_cachelines *
+ h->cacheline_size;
+ (*fp) (h, chunk_baseva, first_chunk_number_of_records);
+ (*fp) (h, file_baseva,
+ records_this_file - first_chunk_number_of_records);
+ }
if (munmap (file_baseva, file_size_in_bytes) < 0)
{