forked from SLFO-pool/xen
124 lines
4.5 KiB
Diff
124 lines
4.5 KiB
Diff
From: Olaf Hering <olaf@aepfle.de>
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Date: Fri, 23 Oct 2020 11:40:45 +0200
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Subject: libxc sr save guest_data
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tools: save: preallocate guest_data array
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Remove repeated allocation from migration loop. There will never be
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more than MAX_BATCH_SIZE pages to process in a batch.
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Allocate the space once.
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Because this was allocated with calloc:
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Adjust the loop to clear unused entries as needed.
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Signed-off-by: Olaf Hering <olaf@aepfle.de>
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---
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tools/libs/guest/xg_sr_common.h | 1 +
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tools/libs/guest/xg_sr_save.c | 20 +++++++++++---------
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2 files changed, 12 insertions(+), 9 deletions(-)
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--- a/tools/libs/guest/xg_sr_common.h
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+++ b/tools/libs/guest/xg_sr_common.h
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@@ -249,6 +249,7 @@ struct xc_sr_context
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int *errors;
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struct iovec *iov;
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uint64_t *rec_pfns;
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+ void **guest_data;
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unsigned int nr_batch_pfns;
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unsigned long *deferred_pages;
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unsigned long nr_deferred_pages;
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--- a/tools/libs/guest/xg_sr_save.c
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+++ b/tools/libs/guest/xg_sr_save.c
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@@ -89,7 +89,6 @@ static int write_batch(struct xc_sr_cont
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{
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xc_interface *xch = ctx->xch;
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void *guest_mapping = NULL;
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- void **guest_data = NULL;
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void **local_pages = NULL;
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int rc = -1;
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unsigned int i, p, nr_pages = 0, nr_pages_mapped = 0;
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@@ -103,12 +102,10 @@ static int write_batch(struct xc_sr_cont
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assert(nr_pfns != 0);
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- /* Pointers to page data to send. Mapped gfns or local allocations. */
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- guest_data = calloc(nr_pfns, sizeof(*guest_data));
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/* Pointers to locally allocated pages. Need freeing. */
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local_pages = calloc(nr_pfns, sizeof(*local_pages));
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- if ( !guest_data || !local_pages )
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+ if ( !local_pages )
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{
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ERROR("Unable to allocate arrays for a batch of %u pages",
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nr_pfns);
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@@ -165,7 +162,10 @@ static int write_batch(struct xc_sr_cont
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for ( i = 0, p = 0; i < nr_pfns; ++i )
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{
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if ( !page_type_has_stream_data(ctx->save.types[i]) )
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+ {
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+ ctx->save.guest_data[i] = NULL;
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continue;
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+ }
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if ( ctx->save.errors[p] )
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{
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@@ -183,6 +183,7 @@ static int write_batch(struct xc_sr_cont
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if ( rc )
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{
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+ ctx->save.guest_data[i] = NULL;
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if ( rc == -1 && errno == EAGAIN )
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{
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set_bit(ctx->save.batch_pfns[i], ctx->save.deferred_pages);
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@@ -194,7 +195,7 @@ static int write_batch(struct xc_sr_cont
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goto err;
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}
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else
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- guest_data[i] = page;
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+ ctx->save.guest_data[i] = page;
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rc = -1;
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++p;
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@@ -232,9 +233,9 @@ static int write_batch(struct xc_sr_cont
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{
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for ( i = 0; i < nr_pfns; ++i )
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{
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- if ( guest_data[i] )
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+ if ( ctx->save.guest_data[i] )
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{
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- ctx->save.iov[iovcnt].iov_base = guest_data[i];
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+ ctx->save.iov[iovcnt].iov_base = ctx->save.guest_data[i];
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ctx->save.iov[iovcnt].iov_len = PAGE_SIZE;
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iovcnt++;
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--nr_pages;
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@@ -258,7 +259,6 @@ static int write_batch(struct xc_sr_cont
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for ( i = 0; local_pages && i < nr_pfns; ++i )
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free(local_pages[i]);
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free(local_pages);
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- free(guest_data);
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return rc;
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}
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@@ -836,11 +836,12 @@ static int setup(struct xc_sr_context *c
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ctx->save.errors = malloc(MAX_BATCH_SIZE * sizeof(*ctx->save.errors));
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ctx->save.iov = malloc((4 + MAX_BATCH_SIZE) * sizeof(*ctx->save.iov));
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ctx->save.rec_pfns = malloc(MAX_BATCH_SIZE * sizeof(*ctx->save.rec_pfns));
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+ ctx->save.guest_data = malloc(MAX_BATCH_SIZE * sizeof(*ctx->save.guest_data));
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ctx->save.deferred_pages = bitmap_alloc(ctx->save.p2m_size);
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if ( !ctx->save.batch_pfns || !ctx->save.mfns || !ctx->save.types ||
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!ctx->save.errors || !ctx->save.iov || !ctx->save.rec_pfns ||
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- !dirty_bitmap || !ctx->save.deferred_pages )
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+ !ctx->save.guest_data ||!dirty_bitmap || !ctx->save.deferred_pages )
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{
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ERROR("Unable to allocate memory for dirty bitmaps, batch pfns and"
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" deferred pages");
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@@ -871,6 +872,7 @@ static void cleanup(struct xc_sr_context
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xc_hypercall_buffer_free_pages(xch, dirty_bitmap,
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NRPAGES(bitmap_size(ctx->save.p2m_size)));
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free(ctx->save.deferred_pages);
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+ free(ctx->save.guest_data);
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free(ctx->save.rec_pfns);
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free(ctx->save.iov);
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free(ctx->save.errors);
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