| From: | "Simon Riggs" <simon(at)2ndquadrant(dot)com> |
|---|---|
| To: | "Heikki Linnakangas" <heikki(at)enterprisedb(dot)com> |
| Cc: | "Pavan Deolasee" <pavan(dot)deolasee(at)gmail(dot)com>, "PostgreSQL-patches" <pgsql-patches(at)postgresql(dot)org> |
| Subject: | Re: HOT patch - version 11 |
| Date: | 2007-08-02 14:37:32 |
| Message-ID: | 1186065452.4161.2.camel@ebony.site |
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| Thread: | |
| Lists: | pgsql-hackers pgsql-patches |
On Wed, 2007-08-01 at 21:09 +0100, Heikki Linnakangas wrote:
> In heap_page_prune_defrag, it would be better to do the test for
> BufferIsLockedForCleanup right after acquiring the lock. The longer the
> delay between those steps, the bigger the chances that someone pins the
> page and starts to wait for the buffer lock, making us think that we
> didn't get the cleanup lock, though we actually did. Maybe a nicer
> solution would be to have another version of ConditionalLockBuffer with
> three different return values: didn't get lock, got exclusive lock, or
> got cleanup lock.
Yeh, 3-value return seems neatest way.
--
Simon Riggs
EnterpriseDB http://www.enterprisedb.com
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