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Reduce the amount of memory "clobbered" for every process title change,

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on platforms that need this.  This is done by only writing past the
previously stored message, if it was longer.
This commit is contained in:
Bruce Momjian 2007-02-16 21:34:04 +00:00
parent 8249409bc1
commit 1d722cf18c
1 changed files with 8 additions and 4 deletions
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12
src/backend/utils/misc/ps_status.c
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@ -5,7 +5,7 @@
* to contain some useful information. Mechanism differs wildly across
* platforms.
*
* $PostgreSQL: pgsql/src/backend/utils/misc/ps_status.c,v 1.34 2007/01/05 22:19:46 momjian Exp $
* $PostgreSQL: pgsql/src/backend/utils/misc/ps_status.c,v 1.35 2007/02/16 21:34:04 momjian Exp $
*
* Copyright (c) 2000-2007, PostgreSQL Global Development Group
* various details abducted from various places
@ -91,6 +91,7 @@ static const size_t ps_buffer_size = PS_BUFFER_SIZE;
#else /* PS_USE_CLOBBER_ARGV */
static char *ps_buffer; /* will point to argv area */
static size_t ps_buffer_size; /* space determined at run time */
static size_t last_status_len; /* use to minimize length of clobber */
#endif /* PS_USE_CLOBBER_ARGV */
static size_t ps_buffer_fixed_size; /* size of the constant prefix */
@ -153,8 +154,8 @@ save_ps_display_args(int argc, char **argv)
}
ps_buffer = argv[0];
ps_buffer_size = end_of_area - argv[0];
last_status_len = ps_buffer_size = end_of_area - argv[0];
/*
* move the environment out of the way
*/
@ -329,7 +330,10 @@ set_ps_display(const char *activity, bool force)
/* pad unused memory */
buflen = strlen(ps_buffer);
MemSet(ps_buffer + buflen, PS_PADDING, ps_buffer_size - buflen);
/* clobber remainder of old status string */
if (last_status_len > buflen)
MemSet(ps_buffer + buflen, PS_PADDING, last_status_len - buflen);
last_status_len = buflen;
}
#endif /* PS_USE_CLOBBER_ARGV */