# HG changeset patch
# User Ian Campbell <ian.campbell@xxxxxxxxxx>
# Date 1306228450 -3600
# Node ID 0a7ee235f5139cce2a3c1220086d16b847279dc6
# Parent c43bf40e2f29eb02c7dcf1a2317f243f1af5f659
libxc: save: drop code under ADAPTIVE_SAVE ifdef.
The ifdef was added in 2005 (7702:b3c2bc39d815) but, as far as I can see, was
never enabled by default. Dropping it will help untangle some macros redefining
functions etc.
Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
diff -r c43bf40e2f29 -r 0a7ee235f513 tools/libxc/xc_domain_save.c
--- a/tools/libxc/xc_domain_save.c Tue May 24 10:14:10 2011 +0100
+++ b/tools/libxc/xc_domain_save.c Tue May 24 10:14:10 2011 +0100
@@ -252,98 +252,6 @@ static inline int write_buffer(xc_interf
return write_exact(fd, buf, len);
}
-#ifdef ADAPTIVE_SAVE
-
-/*
-** We control the rate at which we transmit (or save) to minimize impact
-** on running domains (including the target if we're doing live migrate).
-*/
-
-#define MAX_MBIT_RATE 500 /* maximum transmit rate for migrate */
-#define START_MBIT_RATE 100 /* initial transmit rate for migrate */
-
-/* Scaling factor to convert between a rate (in Mb/s) and time (in usecs) */
-#define RATE_TO_BTU 781250
-
-/* Amount in bytes we allow ourselves to send in a burst */
-#define BURST_BUDGET (100*1024)
-
-/* We keep track of the current and previous transmission rate */
-static int mbit_rate, ombit_rate = 0;
-
-/* Have we reached the maximum transmission rate? */
-#define RATE_IS_MAX() (mbit_rate == MAX_MBIT_RATE)
-
-static inline void initialize_mbit_rate()
-{
- mbit_rate = START_MBIT_RATE;
-}
-
-static int ratewrite(xc_interface *xch, int io_fd, int live, void *buf, int n)
-{
- static int budget = 0;
- static int burst_time_us = -1;
- static struct timeval last_put = { 0 };
- struct timeval now;
- struct timespec delay;
- long long delta;
-
- if ( START_MBIT_RATE == 0 )
- return noncached_write(io_fd, live, buf, n);
-
- budget -= n;
- if ( budget < 0 )
- {
- if ( mbit_rate != ombit_rate )
- {
- burst_time_us = RATE_TO_BTU / mbit_rate;
- ombit_rate = mbit_rate;
- DPRINTF("rate limit: %d mbit/s burst budget %d slot time %d\n",
- mbit_rate, BURST_BUDGET, burst_time_us);
- }
- if ( last_put.tv_sec == 0 )
- {
- budget += BURST_BUDGET;
- gettimeofday(&last_put, NULL);
- }
- else
- {
- while ( budget < 0 )
- {
- gettimeofday(&now, NULL);
- delta = tv_delta(&now, &last_put);
- while ( delta > burst_time_us )
- {
- budget += BURST_BUDGET;
- last_put.tv_usec += burst_time_us;
- if ( last_put.tv_usec > 1000000 )
- {
- last_put.tv_usec -= 1000000;
- last_put.tv_sec++;
- }
- delta -= burst_time_us;
- }
- if ( budget > 0 )
- break;
- delay.tv_sec = 0;
- delay.tv_nsec = 1000 * (burst_time_us - delta);
- while ( delay.tv_nsec > 0 )
- if ( nanosleep(&delay, &delay) == 0 )
- break;
- }
- }
- }
- return noncached_write(io_fd, live, buf, n);
-}
-
-#else /* ! ADAPTIVE SAVE */
-
-#define RATE_IS_MAX() (0)
-#define ratewrite(xch, _io_fd, _live, _buf, _n) noncached_write((xch),
(_io_fd), (_live), (_buf), (_n))
-#define initialize_mbit_rate()
-
-#endif
-
/* like write_buffer for ratewrite, which returns number of bytes written */
static inline int ratewrite_buffer(xc_interface *xch,
int dobuf, struct outbuf* ob, int fd,
@@ -352,7 +260,7 @@ static inline int ratewrite_buffer(xc_in
if ( dobuf )
return outbuf_hardwrite(xch, ob, fd, buf, len) ? -1 : len;
else
- return ratewrite(xch, fd, live, buf, len);
+ return noncached_write(xch, fd, live, buf, len);
}
static int print_stats(xc_interface *xch, uint32_t domid, int pages_sent,
@@ -392,16 +300,6 @@ static int print_stats(xc_interface *xch
(int)((stats->dirty_count*PAGE_SIZE)/(wall_delta*(1000/8))),
stats->dirty_count);
-#ifdef ADAPTIVE_SAVE
- if ( ((stats->dirty_count*PAGE_SIZE)/(wall_delta*(1000/8))) > mbit_rate )
- {
- mbit_rate = (int)((stats->dirty_count*PAGE_SIZE)/(wall_delta*(1000/8)))
- + 50;
- if ( mbit_rate > MAX_MBIT_RATE )
- mbit_rate = MAX_MBIT_RATE;
- }
-#endif
-
d0_cpu_last = d0_cpu_now;
d1_cpu_last = d1_cpu_now;
wall_last = wall_now;
@@ -979,8 +877,6 @@ int xc_domain_save(xc_interface *xch, in
max_iters = max_iters ? : DEF_MAX_ITERS;
max_factor = max_factor ? : DEF_MAX_FACTOR;
- initialize_mbit_rate();
-
if ( !get_platform_info(xch, dom,
&ctx->max_mfn, &ctx->hvirt_start, &ctx->pt_levels,
&dinfo->guest_width) )
{
@@ -1170,9 +1066,6 @@ int xc_domain_save(xc_interface *xch, in
copypages:
#define wrexact(fd, buf, len) write_buffer(xch, last_iter, &ob, (fd), (buf),
(len))
-#ifdef ratewrite
-#undef ratewrite
-#endif
#define ratewrite(fd, live, buf, len) ratewrite_buffer(xch, last_iter, &ob,
(fd), (live), (buf), (len))
/* Now write out each data page, canonicalising page tables as we go... */
@@ -1509,8 +1402,7 @@ int xc_domain_save(xc_interface *xch, in
if ( live )
{
- if ( ((sent_this_iter > sent_last_iter) && RATE_IS_MAX()) ||
- (iter >= max_iters) ||
+ if ( (iter >= max_iters) ||
(sent_this_iter+skip_this_iter < 50) ||
(total_sent > dinfo->p2m_size*max_factor) )
{
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