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add separate counters for ioctl read misses, and some debugging LOG messages

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This commit is contained in:
Heikki Linnakangas
2025-05-21 01:33:58 +03:00
parent 01abd4afc5
commit 14fefd261f
1 changed files with 34 additions and 3 deletions
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pgxn/neon/file_cache.c
+34 -3
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@@ -166,7 +166,9 @@ typedef struct FileCacheControl
uint64 evicted_pages; /* number of evicted pages */
/* FIXME: should make these atomic, they're not protected by any locks */
uint64 kernel_module_read_hits; /* success returns from read ioctl */
uint64 kernel_module_read_misses; /* ENOENT returns from read ioctl */
uint64 kernel_module_write_hits; /* success returns from write ioctl */
uint64 kernel_module_write_misses; /* ENOMEM returns from write ioctl */
dlist_head lru; /* double linked list for LRU replacement
@@ -1447,9 +1449,20 @@ pread_with_ioctl(void *buffer, uint64 blkno)
};
int rc;
errno = 0;
elog(LOG, "calling ioctl read for blk %lu with buffer=%p (shared_buffers is at %p-%p)",
blkno,
buffer,
BufferBlocks,
BufferBlocks + BLCKSZ * NBuffers);
rc = ioctl(lfc_desc, NEON_IOCTL_READ, &args);
if (rc < 0 && errno == ENOENT)
if (rc >= 0)
lfc_ctl->kernel_module_read_hits++;
else if (rc < 0 && errno == ENOENT)
lfc_ctl->kernel_module_read_misses++;
else
elog(LOG, "ioctl read failed for blk %lu with buffer=%p: %m", blkno, buffer);
return rc;
}
@@ -1467,8 +1480,16 @@ pwrite_with_ioctl(const void *buffer, uint64 blkno)
};
int rc;
elog(LOG, "calling ioctl write for blk %lu with buffer=%p (shared_buffers is at %p-%p)",
blkno,
buffer,
BufferBlocks,
BufferBlocks + BLCKSZ * NBuffers);
rc = ioctl(lfc_desc, NEON_IOCTL_WRITE, &args);
if (rc < 0 && errno == ENOMEM)
if (rc >= 0)
lfc_ctl->kernel_module_write_hits++;
else if (rc < 0 && errno == ENOMEM)
lfc_ctl->kernel_module_write_misses++;
return rc;
}
@@ -2117,11 +2138,21 @@ neon_get_lfc_stats(PG_FUNCTION_ARGS)
value = lfc_ctl->pinned;
break;
case 10:
key = "file_cache_kernel_module_read_hits";
if (lfc_ctl)
value = lfc_ctl->kernel_module_read_hits;
break;
case 11:
key = "file_cache_kernel_module_read_misses";
if (lfc_ctl)
value = lfc_ctl->kernel_module_read_misses;
break;
case 11:
case 12:
key = "file_cache_kernel_module_write_hits";
if (lfc_ctl)
value = lfc_ctl->kernel_module_write_hits;
break;
case 13:
key = "file_cache_kernel_module_write_misses";
if (lfc_ctl)
value = lfc_ctl->kernel_module_write_misses;