From nobody Mon Feb 9 15:11:07 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 16261996127141008.3015083122142; Tue, 13 Jul 2021 11:06:52 -0700 (PDT) Received: from list by lists.xenproject.org with outflank-mailman.155545.287201 (Exim 4.92) (envelope-from ) id 1m3Mnn-0005kW-6b; Tue, 13 Jul 2021 18:06:39 +0000 Received: by outflank-mailman (output) from mailman id 155545.287201; Tue, 13 Jul 2021 18:06:39 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1m3Mnn-0005jo-0s; Tue, 13 Jul 2021 18:06:39 +0000 Received: by outflank-mailman (input) for mailman id 155545; Tue, 13 Jul 2021 18:06:38 +0000 Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1m3Mnl-0002kr-TS for xen-devel@lists.xenproject.org; Tue, 13 Jul 2021 18:06:37 +0000 Received: from mo4-p02-ob.smtp.rzone.de (unknown [85.215.255.80]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id 05524e77-e405-11eb-8793-12813bfff9fa; Tue, 13 Jul 2021 18:06:20 +0000 (UTC) Received: from sender by smtp.strato.de (RZmta 47.28.1 AUTH) with ESMTPSA id 30791cx6DI6EtAp (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256 bits)) (Client did not present a certificate); Tue, 13 Jul 2021 20:06:14 +0200 (CEST) X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 05524e77-e405-11eb-8793-12813bfff9fa DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; t=1626199574; s=strato-dkim-0002; d=aepfle.de; h=References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Cc:Date: From:Subject:Sender; bh=LtyVn9iWhbeG3QGf2nqJ2jlqNwljeyLy9bqS6muxnCY=; b=TwKmNEFGrByXOUSKlKyVErjP2hkP9l9R4JHcqbeop4rPR+2Ihe1ItAOP8mHGOSz2zw msCAcjiJ8UYk8Srchu1mPulRWdnpVi2SGwA1pKEFiNnnM6FdYn1ZkSz13UqG4RJJfHvl 1yTz1mqfJU69hYPBsujLWN0cCDqCI2bZ4RF9XDQptM84w9+buvB4PuCBfUkSwchaI9Li umqESpwS+me9yWnyMdmQk9qenWTiCWtD8ffiPQuE7ZxE4wsnkgxhG71YVHINCSfT3ES1 v3Xe5Stifm8ZMJFPcFUk1NqWHbCrFc4Sc1yNjkmT79ZiNsgxkM98YoniQMOP7kCscPa5 n8sw== Authentication-Results: strato.com; dkim=none X-RZG-AUTH: ":P2EQZWCpfu+qG7CngxMFH1J+3q8wa/QXkBR9MXjAuzpIG0mv9coXAgthqlagRsstpH9XYEN5v9xf7dypFU9ge5p0Oi0V" X-RZG-CLASS-ID: mo00 From: Olaf Hering To: xen-devel@lists.xenproject.org Cc: Olaf Hering , Ian Jackson , Wei Liu , Juergen Gross Subject: [PATCH v20210713 08/31] tools: save: preallocate types array Date: Tue, 13 Jul 2021 20:05:42 +0200 Message-Id: <20210713180605.12096-9-olaf@aepfle.de> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210713180605.12096-1-olaf@aepfle.de> References: <20210713180605.12096-1-olaf@aepfle.de> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1626199614386100001 Content-Type: text/plain; charset="utf-8" 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 --- 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_commo= n.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 =20 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 =3D ctx->xch; - xen_pfn_t *types =3D NULL; void *guest_mapping =3D NULL; void **guest_data =3D NULL; void **local_pages =3D NULL; @@ -105,8 +104,6 @@ static int write_batch(struct xc_sr_context *ctx) =20 assert(nr_pfns !=3D 0); =20 - /* Types of the batch pfns. */ - types =3D malloc(nr_pfns * sizeof(*types)); /* Errors from attempting to map the gfns. */ errors =3D 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 =3D malloc((nr_pfns + 4) * sizeof(*iov)); =20 - 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) =20 for ( i =3D 0; i < nr_pfns; ++i ) { - types[i] =3D ctx->save.mfns[i] =3D ctx->save.ops.pfn_to_gfn(ctx, + ctx->save.types[i] =3D ctx->save.mfns[i] =3D ctx->save.ops.pfn_to_= gfn(ctx, ctx->save.batch_pfns= [i]); =20 /* Likely a ballooned page. */ @@ -136,7 +133,7 @@ static int write_batch(struct xc_sr_context *ctx) } } =20 - rc =3D xc_get_pfn_type_batch(xch, ctx->domid, nr_pfns, types); + rc =3D 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) =20 for ( i =3D 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; } =20 - if ( !page_type_has_stream_data(types[i]) ) + if ( !page_type_has_stream_data(ctx->save.types[i]) ) continue; =20 ctx->save.mfns[nr_pages++] =3D ctx->save.mfns[i]; @@ -172,7 +169,7 @@ static int write_batch(struct xc_sr_context *ctx) =20 for ( i =3D 0, p =3D 0; i < nr_pfns; ++i ) { - if ( !page_type_has_stream_data(types[i]) ) + if ( !page_type_has_stream_data(ctx->save.types[i]) ) continue; =20 if ( errors[p] ) @@ -183,7 +180,7 @@ static int write_batch(struct xc_sr_context *ctx) } =20 orig_page =3D page =3D guest_mapping + (p * PAGE_SIZE); - rc =3D ctx->save.ops.normalise_page(ctx, types[i], &page); + rc =3D ctx->save.ops.normalise_page(ctx, ctx->save.types[i], &= page); =20 if ( orig_page !=3D page ) local_pages[i] =3D page; @@ -194,7 +191,7 @@ static int write_batch(struct xc_sr_context *ctx) { set_bit(ctx->save.batch_pfns[i], ctx->save.deferred_pa= ges); ++ctx->save.nr_deferred_pages; - types[i] =3D XEN_DOMCTL_PFINFO_XTAB; + ctx->save.types[i] =3D XEN_DOMCTL_PFINFO_XTAB; --nr_pages; } else @@ -223,7 +220,7 @@ static int write_batch(struct xc_sr_context *ctx) rec.length +=3D nr_pages * PAGE_SIZE; =20 for ( i =3D 0; i < nr_pfns; ++i ) - rec_pfns[i] =3D ((uint64_t)(types[i]) << 32) | ctx->save.batch_pfn= s[i]; + rec_pfns[i] =3D ((uint64_t)(ctx->save.types[i]) << 32) | ctx->save= .batch_pfns[i]; =20 iov[0].iov_base =3D &rec.type; iov[0].iov_len =3D 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); =20 return rc; } @@ -850,9 +846,10 @@ static int setup(struct xc_sr_context *ctx) ctx->save.batch_pfns =3D malloc(MAX_BATCH_SIZE * sizeof(*ctx->save.batch_pfns)); ctx->save.mfns =3D malloc(MAX_BATCH_SIZE * sizeof(*ctx->save.mfns)); + ctx->save.types =3D malloc(MAX_BATCH_SIZE * sizeof(*ctx->save.types)); ctx->save.deferred_pages =3D bitmap_alloc(ctx->save.p2m_size); =20 - 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); }