https://github.com/postgres/postgres
Since a892234 & fd31cd265 the visibilitymap's freeze bit is used to avoid vacuuming the whole relation in anti-wraparound vacuums. Doing so correctly relies on not adding xids to the heap without also unsetting the visibilitymap flag. Tuple locking related code has not done so. To allow selectively resetting all-frozen - to avoid pessimizing heap_lock_tuple - allow to selectively reset the all-frozen with visibilitymap_clear(). To avoid having to use visibilitymap_get_status (e.g. via VM_ALL_FROZEN) inside a critical section, have visibilitymap_clear() return whether any bits have been reset. There's a remaining issue (denoted by XXX): After the PageIsAllVisible() check in heap_lock_tuple() and heap_lock_updated_tuple_rec() the page status could theoretically change. Practically that currently seems impossible, because updaters will hold a page level pin already. Due to the next beta coming up, it seems better to get the required WAL magic bump done before resolving this issue. The added flags field fields to xl_heap_lock and xl_heap_lock_updated require bumping the WAL magic. Since there's already been a catversion bump since the last beta, that's not an issue. Reviewed-By: Robert Haas, Amit Kapila and Andres Freund Author: Masahiko Sawada, heavily revised by Andres Freund Discussion: CAEepm=3fWAbWryVW9swHyLTY4sXVf0xbLvXqOwUoDiNCx9mBjQ@mail.gmail.com Backpatch: -
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- eca0f1db14ac92d91d54eca8eeff2d15ccd797fa
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File | Mode | Size |
---|---|---|
config | ||
contrib | ||
doc | ||
src | ||
.dir-locals.el | -rw-r--r-- | 738 bytes |
.gitattributes | -rw-r--r-- | 1.7 KB |
.gitignore | -rw-r--r-- | 434 bytes |
COPYRIGHT | -rw-r--r-- | 1.2 KB |
GNUmakefile.in | -rw-r--r-- | 3.6 KB |
HISTORY | -rw-r--r-- | 283 bytes |
Makefile | -rw-r--r-- | 1.5 KB |
README | -rw-r--r-- | 1.2 KB |
README.git | -rw-r--r-- | 727 bytes |
aclocal.m4 | -rw-r--r-- | 384 bytes |
configure | -rwxr-xr-x | 459.3 KB |
configure.in | -rw-r--r-- | 72.9 KB |
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Computing file changes ...