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qmemman: when a AppVM is low on memory, allow small adjustments

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A small AppVM (say, with 100MB total) can go below prefmem, and
still not be assigned memory, because of the MIN_TOTAL_MEMORY_TRANSFER
threshold.
So, if AppVM is below prefmem, allow for smaller mem-sets.
This commit is contained in:
Rafal Wojtczuk 2010-09-10 11:35:30 +02:00
parent f6e3607d2d
commit 0c1f21a28e
2 changed files with 14 additions and 6 deletions
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12
common/meminfo-writer.c
View File

@ -17,7 +17,8 @@ char *parse(char *buf)
static char outbuf[4096];
int val;
int len;
int MemTotal=0, MemFree=0, Buffers=0, Cached=0, SwapTotal=0, SwapFree=0;
int MemTotal = 0, MemFree = 0, Buffers = 0, Cached = 0, SwapTotal =
0, SwapFree = 0;
unsigned long long key;
long used_mem, used_mem_diff;
int nitems = 0;
@ -54,10 +55,12 @@ char *parse(char *buf)
return NULL;
used_mem_diff = used_mem - prev_used_mem;
prev_used_mem = used_mem;
if (used_mem_diff < 0)
used_mem_diff = -used_mem_diff;
if (used_mem_diff > used_mem_change_threshold) {
if (used_mem_diff > used_mem_change_threshold
|| (used_mem > prev_used_mem && used_mem * 13 / 10 > MemTotal
&& used_mem_diff > used_mem_change_threshold/2)) {
prev_used_mem = used_mem;
sprintf(outbuf,
"MemTotal: %d kB\nMemFree: %d kB\nBuffers: %d kB\nCached: %d kB\n"
"SwapTotal: %d kB\nSwapFree: %d kB\n", MemTotal,
@ -82,8 +85,7 @@ void send_to_qmemman(struct xs_handle *xs, char *data)
}
}
int
main(int argc, char **argv)
int main(int argc, char **argv)
{
char buf[4096];
int n;

8
dom0/qmemman/qmemman.py
View File

@ -101,10 +101,16 @@ class SystemState:
def is_balance_req_significant(self, memset_reqs):
total_memory_transfer = 0
MIN_TOTAL_MEMORY_TRANSFER = 150*1024*1024
MIN_MEM_CHANGE_WHEN_UNDER_PREF = 15*1024*1024
for rq in memset_reqs:
dom, mem = rq
memory_change = mem - self.domdict[dom].last_target
last_target = self.domdict[dom].last_target
memory_change = mem - last_target
total_memory_transfer += abs(memory_change)
pref = qmemman_algo.prefmem(self.domdict[dom])
if last_target > 0 and last_target < pref and memory_change > MIN_MEM_CHANGE_WHEN_UNDER_PREF:
print 'dom', dom, 'is below pref, allowing balance'
return True
return total_memory_transfer > MIN_TOTAL_MEMORY_TRANSFER
def print_stats(self, xenfree, memset_reqs):