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Re: [Xen-devel] [PATCH v4 09/14] libxc/save: adjust the memory allocation for migration
On 05/12/2015 08:14 PM, Andrew Cooper wrote:
On 12/05/15 12:25, Yang Hongyang wrote:
Move the memory allocation before the concrete live/nolive save
in order to avoid the free/alloc memory loop when using Remus.
Signed-off-by: Yang Hongyang <yanghy@xxxxxxxxxxxxxx>
CC: Ian Campbell <Ian.Campbell@xxxxxxxxxx>
CC: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
CC: Wei Liu <wei.liu2@xxxxxxxxxx>
CC: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
tools/libxc/xc_sr_common.h | 1 +
tools/libxc/xc_sr_save.c | 61 ++++++++++++++++++++++------------------------
2 files changed, 30 insertions(+), 32 deletions(-)
diff --git a/tools/libxc/xc_sr_common.h b/tools/libxc/xc_sr_common.h
index c0f90d4..276d00a 100644
--- a/tools/libxc/xc_sr_common.h
+++ b/tools/libxc/xc_sr_common.h
@@ -190,6 +190,7 @@ struct xc_sr_context
unsigned nr_batch_pfns;
unsigned long *deferred_pages;
unsigned long nr_deferred_pages;
+ xc_hypercall_buffer_t dirty_bitmap_hbuf;
} save;
struct /* Restore data. */
diff --git a/tools/libxc/xc_sr_save.c b/tools/libxc/xc_sr_save.c
index 368aacb..0953c35 100644
--- a/tools/libxc/xc_sr_save.c
+++ b/tools/libxc/xc_sr_save.c
@@ -475,24 +475,12 @@ static int update_progress_string(struct xc_sr_context
*ctx,
static int send_domain_memory_live(struct xc_sr_context *ctx)
{
xc_interface *xch = ctx->xch;
- DECLARE_HYPERCALL_BUFFER(unsigned long, dirty_bitmap);
xc_shadow_op_stats_t stats = { 0, ctx->save.p2m_size };
char *progress_str = NULL;
unsigned x;
int rc = -1;
-
- dirty_bitmap = xc_hypercall_buffer_alloc_pages(
- xch, dirty_bitmap, NRPAGES(bitmap_size(ctx->save.p2m_size)));
-
- ctx->save.batch_pfns = malloc(MAX_BATCH_SIZE *
- sizeof(*ctx->save.batch_pfns));
- ctx->save.deferred_pages = calloc(1, bitmap_size(ctx->save.p2m_size));
-
- if ( !ctx->save.batch_pfns || !dirty_bitmap || !ctx->save.deferred_pages )
- {
- ERROR("Unable to allocate memory for to_{send,fix}/batch bitmaps");
- goto out;
- }
+ DECLARE_HYPERCALL_BUFFER_SHADOW(unsigned long, dirty_bitmap,
+ (&ctx->save.dirty_bitmap_hbuf));
You can drop this extra bracketing now that
DECLARE_HYPERCALL_BUFFER_SHADOW() has been fixed.
Ok, will drop the bracketing in all DECLARE_HYPERCALL_BUFFER_SHADOW() calls
rc = enable_logdirty(ctx);
if ( rc )
@@ -593,10 +581,6 @@ static int send_domain_memory_live(struct xc_sr_context
*ctx)
out:
xc_set_progress_prefix(xch, NULL);
free(progress_str);
- xc_hypercall_buffer_free_pages(xch, dirty_bitmap,
- NRPAGES(bitmap_size(ctx->save.p2m_size)));
- free(ctx->save.deferred_pages);
- free(ctx->save.batch_pfns);
return rc;
}
@@ -609,17 +593,6 @@ static int send_domain_memory_nonlive(struct xc_sr_context
*ctx)
xc_interface *xch = ctx->xch;
int rc = -1;
- ctx->save.batch_pfns = malloc(MAX_BATCH_SIZE *
- sizeof(*ctx->save.batch_pfns));
- ctx->save.deferred_pages = calloc(1, bitmap_size(ctx->save.p2m_size));
-
- if ( !ctx->save.batch_pfns || !ctx->save.deferred_pages )
- {
- PERROR("Failed to allocate memory for nonlive tracking structures");
- errno = ENOMEM;
- goto err;
- }
-
rc = suspend_domain(ctx);
if ( rc )
goto err;
@@ -631,15 +604,30 @@ static int send_domain_memory_nonlive(struct
xc_sr_context *ctx)
goto err;
err:
- free(ctx->save.deferred_pages);
- free(ctx->save.batch_pfns);
-
return rc;
}
static int setup(struct xc_sr_context *ctx)
{
+ xc_interface *xch = ctx->xch;
int rc;
+ DECLARE_HYPERCALL_BUFFER_SHADOW(unsigned long, dirty_bitmap,
+ (&ctx->save.dirty_bitmap_hbuf));
+
+ dirty_bitmap = xc_hypercall_buffer_alloc_pages(
+ xch, dirty_bitmap,
NRPAGES(bitmap_size(ctx->save.p2m_size)));
+ ctx->save.batch_pfns = malloc(MAX_BATCH_SIZE *
+ sizeof(*ctx->save.batch_pfns));
+ ctx->save.deferred_pages = calloc(1, bitmap_size(ctx->save.p2m_size));
+
+ if ( !ctx->save.batch_pfns || !dirty_bitmap || !ctx->save.deferred_pages )
+ {
+ ERROR("Unable to allocate memory for dirty bitmaps, batch pfns and"
+ " deferred pages");
+ rc = -1;
+ errno = ENOMEM;
+ goto err;
+ }
rc = ctx->save.ops.setup(ctx);
if ( rc )
@@ -655,12 +643,21 @@ static int setup(struct xc_sr_context *ctx)
static void cleanup(struct xc_sr_context *ctx)
{
xc_interface *xch = ctx->xch;
+ DECLARE_HYPERCALL_BUFFER_SHADOW(unsigned long, dirty_bitmap,
+ (&ctx->save.dirty_bitmap_hbuf));
And also drop this bracketing.
+
xc_shadow_control(xch, ctx->domid, XEN_DOMCTL_SHADOW_OP_OFF,
NULL, 0, NULL, 0, NULL);
if ( ctx->save.ops.cleanup(ctx) )
PERROR("Failed to clean up");
+
+ xc_hypercall_buffer_free_pages(xch, dirty_bitmap,
+ NRPAGES(bitmap_size(ctx->save.p2m_size)));
+ free(ctx->save.deferred_pages);
+ free(ctx->save.batch_pfns);
+
Stray blank line.
Otherwise, Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
}
/*
.
--
Thanks,
Yang.
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