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bh=zPzB2Ea/XkNgns/5zMr604KMV7uEET1uzQmhUGE8Zl4=; b=Zm9Fxmnh227rnoPh2z1h87SP3mDURpyMdE8IBX/J4SoKhSODhFYo5HRzA/FrCMbYsc 6ghjx1ekd8+VgzU3ASVxKljdQfQWGHH76RCKJLsqq8FWPpPrpPrtNxucdE+1QbSotC+a u6zLoM5tQuXZs+rfR2ivsN6ESu/ViR2Vj4PokMlMEUE91BL8hoRGKKOrw+OraANLaMGS nfq5A0tZzB58TAsZ5KRyhjgRQxET7rs1li0pXSiQXHpffqUzK1lCkKqvEEQ6lfa9ZrAw FYqtoHipBWL7HJWaTVeVop0+vX7AlxlNFlAHr+XUpK+XOHUKsvzqC6LHx9aRoch730vT Zk6Q== X-RZG-AUTH: ":P2EQZWCpfu+qG7CngxMFH1J+3q8wa/QXkBR9MXjAuzBW/OdlBZQ4AHSS3G1Jjw==" X-RZG-CLASS-ID: mo00 From: Olaf Hering To: xen-devel@lists.xenproject.org Cc: Olaf Hering , Ian Jackson , Wei Liu , Anthony PERARD Subject: [PATCH v1 10/23] tools/guest: save: move errors array Date: Thu, 29 Oct 2020 18:19:50 +0100 Message-Id: <20201029172004.17219-11-olaf@aepfle.de> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201029172004.17219-1-olaf@aepfle.de> References: <20201029172004.17219-1-olaf@aepfle.de> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" Remove allocation from hotpath, move errors array into preallocated space. Signed-off-by: Olaf Hering --- tools/libs/guest/xg_sr_common.h | 2 ++ tools/libs/guest/xg_sr_save.c | 7 ++----- 2 files changed, 4 insertions(+), 5 deletions(-) diff --git a/tools/libs/guest/xg_sr_common.h b/tools/libs/guest/xg_sr_commo= n.h index 3cbadb607b..71b676c0e0 100644 --- a/tools/libs/guest/xg_sr_common.h +++ b/tools/libs/guest/xg_sr_common.h @@ -217,6 +217,8 @@ struct xc_sr_save_arrays { xen_pfn_t mfns[MAX_BATCH_SIZE]; /* write_batch: Types of the batch pfns. */ xen_pfn_t types[MAX_BATCH_SIZE]; + /* write_batch: Errors from attempting to map the gfns. */ + int errors[MAX_BATCH_SIZE]; }; =20 struct xc_sr_restore_arrays { diff --git a/tools/libs/guest/xg_sr_save.c b/tools/libs/guest/xg_sr_save.c index 6678df95b8..cdc27a9cde 100644 --- a/tools/libs/guest/xg_sr_save.c +++ b/tools/libs/guest/xg_sr_save.c @@ -92,7 +92,7 @@ static int write_batch(struct xc_sr_context *ctx) void *guest_mapping =3D NULL; void **guest_data =3D NULL; void **local_pages =3D NULL; - int *errors =3D NULL, rc =3D -1; + int *errors =3D ctx->save.m->errors, rc =3D -1; unsigned int i, p, nr_pages =3D 0, nr_pages_mapped =3D 0; unsigned int nr_pfns =3D ctx->save.nr_batch_pfns; void *page, *orig_page; @@ -105,8 +105,6 @@ static int write_batch(struct xc_sr_context *ctx) =20 assert(nr_pfns !=3D 0); =20 - /* 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. */ guest_data =3D calloc(nr_pfns, sizeof(*guest_data)); /* Pointers to locally allocated pages. Need freeing. */ @@ -114,7 +112,7 @@ static int write_batch(struct xc_sr_context *ctx) /* iovec[] for writev(). */ iov =3D malloc((nr_pfns + 4) * sizeof(*iov)); =20 - if ( !errors || !guest_data || !local_pages || !iov ) + if ( !guest_data || !local_pages || !iov ) { ERROR("Unable to allocate arrays for a batch of %u pages", nr_pfns); @@ -271,7 +269,6 @@ static int write_batch(struct xc_sr_context *ctx) free(iov); free(local_pages); free(guest_data); - free(errors); =20 return rc; }