diff options
Diffstat (limited to 'src/backend/access/transam/slru.c')
| -rw-r--r-- | src/backend/access/transam/slru.c | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/src/backend/access/transam/slru.c b/src/backend/access/transam/slru.c index dd69c232eb4..450c39bbc0c 100644 --- a/src/backend/access/transam/slru.c +++ b/src/backend/access/transam/slru.c @@ -15,7 +15,7 @@ * * We use a control LWLock to protect the shared data structures, plus * per-buffer LWLocks that synchronize I/O for each buffer. The control lock - * must be held to examine or modify any shared state. A process that is + * must be held to examine or modify any shared state. A process that is * reading in or writing out a page buffer does not hold the control lock, * only the per-buffer lock for the buffer it is working on. * @@ -34,7 +34,7 @@ * could have happened while we didn't have the lock). * * As with the regular buffer manager, it is possible for another process - * to re-dirty a page that is currently being written out. This is handled + * to re-dirty a page that is currently being written out. This is handled * by re-setting the page's page_dirty flag. * * @@ -96,7 +96,7 @@ typedef struct SlruFlushData *SlruFlush; * page_lru_count entries to be "reset" to lower values than they should have, * in case a process is delayed while it executes this macro. With care in * SlruSelectLRUPage(), this does little harm, and in any case the absolute - * worst possible consequence is a nonoptimal choice of page to evict. The + * worst possible consequence is a nonoptimal choice of page to evict. The * gain from allowing concurrent reads of SLRU pages seems worth it. */ #define SlruRecentlyUsed(shared, slotno) \ @@ -481,7 +481,7 @@ SimpleLruReadPage_ReadOnly(SlruCtl ctl, int pageno, TransactionId xid) * * NOTE: only one write attempt is made here. Hence, it is possible that * the page is still dirty at exit (if someone else re-dirtied it during - * the write). However, we *do* attempt a fresh write even if the page + * the write). However, we *do* attempt a fresh write even if the page * is already being written; this is for checkpoints. * * Control lock must be held at entry, and will be held at exit. @@ -590,7 +590,7 @@ SlruPhysicalReadPage(SlruCtl ctl, int pageno, int slotno) * In a crash-and-restart situation, it's possible for us to receive * commands to set the commit status of transactions whose bits are in * already-truncated segments of the commit log (see notes in - * SlruPhysicalWritePage). Hence, if we are InRecovery, allow the case + * SlruPhysicalWritePage). Hence, if we are InRecovery, allow the case * where the file doesn't exist, and return zeroes instead. */ fd = BasicOpenFile(path, O_RDWR | PG_BINARY, S_IRUSR | S_IWUSR); @@ -920,9 +920,9 @@ SlruSelectLRUPage(SlruCtl ctl, int pageno) /* * If we find any EMPTY slot, just select that one. Else choose a - * victim page to replace. We normally take the least recently used + * victim page to replace. We normally take the least recently used * valid page, but we will never take the slot containing - * latest_page_number, even if it appears least recently used. We + * latest_page_number, even if it appears least recently used. We * will select a slot that is already I/O busy only if there is no * other choice: a read-busy slot will not be least recently used once * the read finishes, and waiting for an I/O on a write-busy slot is @@ -997,7 +997,7 @@ SlruSelectLRUPage(SlruCtl ctl, int pageno) /* * If all pages (except possibly the latest one) are I/O busy, we'll - * have to wait for an I/O to complete and then retry. In that + * have to wait for an I/O to complete and then retry. In that * unhappy case, we choose to wait for the I/O on the least recently * used slot, on the assumption that it was likely initiated first of * all the I/Os in progress and may therefore finish first. @@ -1149,7 +1149,7 @@ restart:; /* * Hmm, we have (or may have) I/O operations acting on the page, so * we've got to wait for them to finish and then start again. This is - * the same logic as in SlruSelectLRUPage. (XXX if page is dirty, + * the same logic as in SlruSelectLRUPage. (XXX if page is dirty, * wouldn't it be OK to just discard it without writing it? For now, * keep the logic the same as it was.) */ |