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bh=B++RYJANjQEZHzQRb6RRsob3izlvX5G7HJ1Rv0O4H+A=; b=WIz+NE+7xF6vT1cRZSz/As+Y7vlWr2VKQ6uf3nNZG8WvVgAUUTZT7tN/CK97UqIslb dShQsjixmwuLu5ZMK/YCZeDfuEZtOXVgZC0QWtSvXW2PY/zWQ3GL1jQg7YHhBT+mFcA/ f4pN6z29cyCwuxEpRk3Qqnhw9XshKX7KuRzSzU5S22JLyID9gmOHm1He3ku455uoCkV3 jUZ7fAKBG0G8pAZkOQwxg+cAKl5KnbphW/+6/yk/YaNKY/ig5wyy0hof4QQu09GS8DPL HjF5XWtQfMyum2eozgsQjJjs/7dLgJIv2cyQeQ3BtxDzJHdemmzBF6QzIk3Phrj37LhR aCzQ== 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 11/23] tools/guest: save: move iov array Date: Thu, 29 Oct 2020 18:19:51 +0100 Message-Id: <20201029172004.17219-12-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 iov 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 71b676c0e0..f315b4f526 100644 --- a/tools/libs/guest/xg_sr_common.h +++ b/tools/libs/guest/xg_sr_common.h @@ -219,6 +219,8 @@ struct xc_sr_save_arrays { xen_pfn_t types[MAX_BATCH_SIZE]; /* write_batch: Errors from attempting to map the gfns. */ int errors[MAX_BATCH_SIZE]; + /* write_batch: iovec[] for writev(). */ + struct iovec iov[MAX_BATCH_SIZE + 4]; }; =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 cdc27a9cde..385a591332 100644 --- a/tools/libs/guest/xg_sr_save.c +++ b/tools/libs/guest/xg_sr_save.c @@ -97,7 +97,7 @@ static int write_batch(struct xc_sr_context *ctx) unsigned int nr_pfns =3D ctx->save.nr_batch_pfns; void *page, *orig_page; uint64_t *rec_pfns =3D NULL; - struct iovec *iov =3D NULL; int iovcnt =3D 0; + struct iovec *iov =3D ctx->save.m->iov; int iovcnt =3D 0; struct xc_sr_rec_page_data_header hdr =3D { 0 }; struct xc_sr_record rec =3D { .type =3D REC_TYPE_PAGE_DATA, @@ -109,10 +109,8 @@ static int write_batch(struct xc_sr_context *ctx) guest_data =3D calloc(nr_pfns, sizeof(*guest_data)); /* Pointers to locally allocated pages. Need freeing. */ local_pages =3D calloc(nr_pfns, sizeof(*local_pages)); - /* iovec[] for writev(). */ - iov =3D malloc((nr_pfns + 4) * sizeof(*iov)); =20 - if ( !guest_data || !local_pages || !iov ) + if ( !guest_data || !local_pages ) { ERROR("Unable to allocate arrays for a batch of %u pages", nr_pfns); @@ -266,7 +264,6 @@ static int write_batch(struct xc_sr_context *ctx) xenforeignmemory_unmap(xch->fmem, guest_mapping, nr_pages_mapped); for ( i =3D 0; local_pages && i < nr_pfns; ++i ) free(local_pages[i]); - free(iov); free(local_pages); free(guest_data); =20