From: Olaf Hering <olaf@aepfle.de>
To: xen-devel@lists.xenproject.org
Cc: Olaf Hering <olaf@aepfle.de>, Ian Jackson <iwj@xenproject.org>,
Wei Liu <wl@xen.org>, Juergen Gross <jgross@suse.com>
Subject: [PATCH v20210713 08/31] tools: save: preallocate types array
Date: Tue, 13 Jul 2021 20:05:42 +0200 [thread overview]
Message-ID: <20210713180605.12096-9-olaf@aepfle.de> (raw)
In-Reply-To: <20210713180605.12096-1-olaf@aepfle.de>
Remove repeated allocation from migration loop. There will never be
more than MAX_BATCH_SIZE pages to process in a batch.
Allocate the space once.
Signed-off-by: Olaf Hering <olaf@aepfle.de>
---
tools/libs/guest/xg_sr_common.h | 1 +
tools/libs/guest/xg_sr_save.c | 28 +++++++++++++---------------
2 files changed, 14 insertions(+), 15 deletions(-)
diff --git a/tools/libs/guest/xg_sr_common.h b/tools/libs/guest/xg_sr_common.h
index fc403adc64..d80de6e7da 100644
--- a/tools/libs/guest/xg_sr_common.h
+++ b/tools/libs/guest/xg_sr_common.h
@@ -245,6 +245,7 @@ struct xc_sr_context
xen_pfn_t *batch_pfns;
xen_pfn_t *mfns;
+ xen_pfn_t *types;
unsigned int nr_batch_pfns;
unsigned long *deferred_pages;
unsigned long nr_deferred_pages;
diff --git a/tools/libs/guest/xg_sr_save.c b/tools/libs/guest/xg_sr_save.c
index 0abe63a377..29a5fe82f0 100644
--- a/tools/libs/guest/xg_sr_save.c
+++ b/tools/libs/guest/xg_sr_save.c
@@ -88,7 +88,6 @@ static int write_checkpoint_record(struct xc_sr_context *ctx)
static int write_batch(struct xc_sr_context *ctx)
{
xc_interface *xch = ctx->xch;
- xen_pfn_t *types = NULL;
void *guest_mapping = NULL;
void **guest_data = NULL;
void **local_pages = NULL;
@@ -105,8 +104,6 @@ static int write_batch(struct xc_sr_context *ctx)
assert(nr_pfns != 0);
- /* Types of the batch pfns. */
- types = malloc(nr_pfns * sizeof(*types));
/* Errors from attempting to map the gfns. */
errors = malloc(nr_pfns * sizeof(*errors));
/* Pointers to page data to send. Mapped gfns or local allocations. */
@@ -116,7 +113,7 @@ static int write_batch(struct xc_sr_context *ctx)
/* iovec[] for writev(). */
iov = malloc((nr_pfns + 4) * sizeof(*iov));
- if ( !types || !errors || !guest_data || !local_pages || !iov )
+ if ( !errors || !guest_data || !local_pages || !iov )
{
ERROR("Unable to allocate arrays for a batch of %u pages",
nr_pfns);
@@ -125,7 +122,7 @@ static int write_batch(struct xc_sr_context *ctx)
for ( i = 0; i < nr_pfns; ++i )
{
- types[i] = ctx->save.mfns[i] = ctx->save.ops.pfn_to_gfn(ctx,
+ ctx->save.types[i] = ctx->save.mfns[i] = ctx->save.ops.pfn_to_gfn(ctx,
ctx->save.batch_pfns[i]);
/* Likely a ballooned page. */
@@ -136,7 +133,7 @@ static int write_batch(struct xc_sr_context *ctx)
}
}
- rc = xc_get_pfn_type_batch(xch, ctx->domid, nr_pfns, types);
+ rc = xc_get_pfn_type_batch(xch, ctx->domid, nr_pfns, ctx->save.types);
if ( rc )
{
PERROR("Failed to get types for pfn batch");
@@ -146,14 +143,14 @@ static int write_batch(struct xc_sr_context *ctx)
for ( i = 0; i < nr_pfns; ++i )
{
- if ( !is_known_page_type(types[i]) )
+ if ( !is_known_page_type(ctx->save.types[i]) )
{
ERROR("Unknown type %#"PRIpfn" for pfn %#"PRIpfn,
- types[i], ctx->save.mfns[i]);
+ ctx->save.types[i], ctx->save.mfns[i]);
goto err;
}
- if ( !page_type_has_stream_data(types[i]) )
+ if ( !page_type_has_stream_data(ctx->save.types[i]) )
continue;
ctx->save.mfns[nr_pages++] = ctx->save.mfns[i];
@@ -172,7 +169,7 @@ static int write_batch(struct xc_sr_context *ctx)
for ( i = 0, p = 0; i < nr_pfns; ++i )
{
- if ( !page_type_has_stream_data(types[i]) )
+ if ( !page_type_has_stream_data(ctx->save.types[i]) )
continue;
if ( errors[p] )
@@ -183,7 +180,7 @@ static int write_batch(struct xc_sr_context *ctx)
}
orig_page = page = guest_mapping + (p * PAGE_SIZE);
- rc = ctx->save.ops.normalise_page(ctx, types[i], &page);
+ rc = ctx->save.ops.normalise_page(ctx, ctx->save.types[i], &page);
if ( orig_page != page )
local_pages[i] = page;
@@ -194,7 +191,7 @@ static int write_batch(struct xc_sr_context *ctx)
{
set_bit(ctx->save.batch_pfns[i], ctx->save.deferred_pages);
++ctx->save.nr_deferred_pages;
- types[i] = XEN_DOMCTL_PFINFO_XTAB;
+ ctx->save.types[i] = XEN_DOMCTL_PFINFO_XTAB;
--nr_pages;
}
else
@@ -223,7 +220,7 @@ static int write_batch(struct xc_sr_context *ctx)
rec.length += nr_pages * PAGE_SIZE;
for ( i = 0; i < nr_pfns; ++i )
- rec_pfns[i] = ((uint64_t)(types[i]) << 32) | ctx->save.batch_pfns[i];
+ rec_pfns[i] = ((uint64_t)(ctx->save.types[i]) << 32) | ctx->save.batch_pfns[i];
iov[0].iov_base = &rec.type;
iov[0].iov_len = sizeof(rec.type);
@@ -275,7 +272,6 @@ static int write_batch(struct xc_sr_context *ctx)
free(local_pages);
free(guest_data);
free(errors);
- free(types);
return rc;
}
@@ -850,9 +846,10 @@ static int setup(struct xc_sr_context *ctx)
ctx->save.batch_pfns = malloc(MAX_BATCH_SIZE *
sizeof(*ctx->save.batch_pfns));
ctx->save.mfns = malloc(MAX_BATCH_SIZE * sizeof(*ctx->save.mfns));
+ ctx->save.types = malloc(MAX_BATCH_SIZE * sizeof(*ctx->save.types));
ctx->save.deferred_pages = bitmap_alloc(ctx->save.p2m_size);
- if ( !ctx->save.batch_pfns || !ctx->save.mfns ||
+ if ( !ctx->save.batch_pfns || !ctx->save.mfns || !ctx->save.types ||
!dirty_bitmap || !ctx->save.deferred_pages )
{
ERROR("Unable to allocate memory for dirty bitmaps, batch pfns and"
@@ -884,6 +881,7 @@ static void cleanup(struct xc_sr_context *ctx)
xc_hypercall_buffer_free_pages(xch, dirty_bitmap,
NRPAGES(bitmap_size(ctx->save.p2m_size)));
free(ctx->save.deferred_pages);
+ free(ctx->save.types);
free(ctx->save.mfns);
free(ctx->save.batch_pfns);
}
next prev parent reply other threads:[~2021-07-13 18:06 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-13 18:05 [PATCH v20210713 00/31] leftover from 2020 Olaf Hering
2021-07-13 18:05 ` [PATCH v20210713 01/31] tools: fix make rpmball Olaf Hering
2021-07-13 18:05 ` [PATCH v20210713 02/31] hotplug/Linux: fix starting of xenstored with restarting systemd Olaf Hering
2021-07-13 18:05 ` [PATCH v20210713 03/31] tools: add API to work with sevaral bits at once Olaf Hering
2021-07-13 18:05 ` [PATCH v20210713 04/31] xl: fix description of migrate --debug Olaf Hering
2021-07-13 18:05 ` [PATCH v20210713 05/31] tools: add readv_exact to libxenctrl Olaf Hering
2021-07-13 18:05 ` [PATCH v20210713 06/31] tools: show migration transfer rate in send_dirty_pages Olaf Hering
2021-07-13 18:05 ` [PATCH v20210713 07/31] tools: save: preallocate mfns array Olaf Hering
2021-07-13 18:05 ` Olaf Hering [this message]
2021-07-13 18:05 ` [PATCH v20210713 09/31] tools: save: preallocate errors array Olaf Hering
2021-07-13 18:05 ` [PATCH v20210713 10/31] tools: save: preallocate iov array Olaf Hering
2021-07-13 18:05 ` [PATCH v20210713 11/31] tools: save: preallocate rec_pfns array Olaf Hering
2021-07-13 18:05 ` [PATCH v20210713 12/31] tools: save: preallocate guest_data array Olaf Hering
2021-07-13 18:05 ` [PATCH v20210713 13/31] tools: save: preallocate local_pages array Olaf Hering
2021-07-13 18:05 ` [PATCH v20210713 14/31] tools: restore: preallocate pfns array Olaf Hering
2021-07-13 18:05 ` [PATCH v20210713 15/31] tools: restore: preallocate types array Olaf Hering
2021-07-13 18:05 ` [PATCH v20210713 16/31] tools: restore: preallocate mfns array Olaf Hering
2021-07-13 18:05 ` [PATCH v20210713 17/31] tools: restore: preallocate map_errs array Olaf Hering
2021-07-13 18:05 ` [PATCH v20210713 18/31] tools: restore: preallocate populate_pfns pfns array Olaf Hering
2021-07-13 18:05 ` [PATCH v20210713 19/31] tools: restore: preallocate populate_pfns mfns array Olaf Hering
2021-07-13 18:05 ` [PATCH v20210713 20/31] tools: restore: split record processing Olaf Hering
2021-07-13 18:05 ` [PATCH v20210713 21/31] tools: restore: split handle_page_data Olaf Hering
2021-07-13 18:05 ` [PATCH v20210713 22/31] tools: restore: write data directly into guest Olaf Hering
2021-07-13 18:05 ` [PATCH v20210713 23/31] tools: recognize LIBXL_API_VERSION for 4.16 Olaf Hering
2021-07-13 18:05 ` [PATCH v20210713 24/31] tools: adjust libxl_domain_suspend to receive a struct props Olaf Hering
2021-07-13 18:05 ` [PATCH v20210713 25/31] tools: add callback to libxl for precopy_policy and precopy_stats Olaf Hering
2021-07-13 18:06 ` [PATCH v20210713 26/31] tools: add --max_iters to libxl_domain_suspend Olaf Hering
2021-07-13 18:06 ` [PATCH v20210713 27/31] tools: add --min_remaining " Olaf Hering
2021-07-13 18:06 ` [PATCH v20210713 28/31] tools: add --abort_if_busy " Olaf Hering
2021-07-13 18:06 ` [PATCH v20210713 29/31] tools: add API for expandable bitmaps Olaf Hering
2021-07-13 18:06 ` [PATCH v20210713 30/31] tools: use xg_sr_bitmap for populated_pfns Olaf Hering
2021-07-13 18:06 ` [PATCH v20210713 31/31] tools: use superpages during restore of HVM guest Olaf Hering
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