Re: [Qemu-devel] [PATCH v5] net: Allocating Large sized arrays to heap
On 03/28/2016 08:34 PM, Pooja Dhannawat wrote: > nc_sendv_compat has a huge stack usage of 69680 bytes approx. > Moving large arrays to heap to reduce stack usage. > > Reviewed-by: Stefan Hajnoczi> Signed-off-by: Pooja Dhannawat > --- > net/net.c | 13 + > 1 file changed, 9 insertions(+), 4 deletions(-) > > diff --git a/net/net.c b/net/net.c > index b0c832e..663da13 100644 > --- a/net/net.c > +++ b/net/net.c > @@ -709,23 +709,28 @@ ssize_t qemu_send_packet_raw(NetClientState *nc, const > uint8_t *buf, int size) > static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov, > int iovcnt, unsigned flags) > { > -uint8_t buf[NET_BUFSIZE]; > +uint8_t *buf = NULL; > uint8_t *buffer; > size_t offset; > +ssize_t ret; > > if (iovcnt == 1) { > buffer = iov[0].iov_base; > offset = iov[0].iov_len; > } else { > +buf = g_new(uint8_t, NET_BUFSIZE); > buffer = buf; > -offset = iov_to_buf(iov, iovcnt, 0, buf, sizeof(buf)); > +offset = iov_to_buf(iov, iovcnt, 0, buf, NET_BUFSIZE); > } > > if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) { > -return nc->info->receive_raw(nc, buffer, offset); > +ret = nc->info->receive_raw(nc, buffer, offset); > } else { > -return nc->info->receive(nc, buffer, offset); > +ret = nc->info->receive(nc, buffer, offset); > } > + > +g_free(buf); > +return ret; > } > > ssize_t qemu_deliver_packet_iov(NetClientState *sender, Applied to -net. Thanks
Re: [Qemu-devel] [PATCH v5] net: Allocating Large sized arrays to heap
On Thu, Mar 31, 2016 at 3:28 PM, Stefan Hajnocziwrote: > On Mon, Mar 28, 2016 at 06:04:11PM +0530, Pooja Dhannawat wrote: > > nc_sendv_compat has a huge stack usage of 69680 bytes approx. > > Moving large arrays to heap to reduce stack usage. > > > > Reviewed-by: Stefan Hajnoczi > > Signed-off-by: Pooja Dhannawat > > --- > > net/net.c | 13 + > > 1 file changed, 9 insertions(+), 4 deletions(-) > > > > diff --git a/net/net.c b/net/net.c > > index b0c832e..663da13 100644 > > --- a/net/net.c > > +++ b/net/net.c > > @@ -709,23 +709,28 @@ ssize_t qemu_send_packet_raw(NetClientState *nc, > const uint8_t *buf, int size) > > static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec > *iov, > > int iovcnt, unsigned flags) > > { > > -uint8_t buf[NET_BUFSIZE]; > > +uint8_t *buf = NULL; > > uint8_t *buffer; > > size_t offset; > > +ssize_t ret; > > > > if (iovcnt == 1) { > > buffer = iov[0].iov_base; > > offset = iov[0].iov_len; > > } else { > > +buf = g_new(uint8_t, NET_BUFSIZE); > > buffer = buf; > > -offset = iov_to_buf(iov, iovcnt, 0, buf, sizeof(buf)); > > +offset = iov_to_buf(iov, iovcnt, 0, buf, NET_BUFSIZE); > > } > > > > if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) { > > -return nc->info->receive_raw(nc, buffer, offset); > > +ret = nc->info->receive_raw(nc, buffer, offset); > > } else { > > -return nc->info->receive(nc, buffer, offset); > > +ret = nc->info->receive(nc, buffer, offset); > > } > > + > > +g_free(buf); > > +return ret; > > } > > > > ssize_t qemu_deliver_packet_iov(NetClientState *sender, > > -- > > 2.5.0 > > CCing Jason Wang, net subsystem maintainer. Please use > scripts/get_maintainer.pl to find the right people to CC in future > patches. > > Yes, I am sorry about that. Fam also pointed out this thing but I forgot this time also. I will keep that mind from onwards. > We may also want to keep a smaller stack buffer so that reasonably-sized > packets (e.g. up to 2 KB) can be send without the performance cost of > g_malloc(). >
Re: [Qemu-devel] [PATCH v5] net: Allocating Large sized arrays to heap
On Mon, Mar 28, 2016 at 06:04:11PM +0530, Pooja Dhannawat wrote: > nc_sendv_compat has a huge stack usage of 69680 bytes approx. > Moving large arrays to heap to reduce stack usage. > > Reviewed-by: Stefan Hajnoczi> Signed-off-by: Pooja Dhannawat > --- > net/net.c | 13 + > 1 file changed, 9 insertions(+), 4 deletions(-) > > diff --git a/net/net.c b/net/net.c > index b0c832e..663da13 100644 > --- a/net/net.c > +++ b/net/net.c > @@ -709,23 +709,28 @@ ssize_t qemu_send_packet_raw(NetClientState *nc, const > uint8_t *buf, int size) > static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov, > int iovcnt, unsigned flags) > { > -uint8_t buf[NET_BUFSIZE]; > +uint8_t *buf = NULL; > uint8_t *buffer; > size_t offset; > +ssize_t ret; > > if (iovcnt == 1) { > buffer = iov[0].iov_base; > offset = iov[0].iov_len; > } else { > +buf = g_new(uint8_t, NET_BUFSIZE); > buffer = buf; > -offset = iov_to_buf(iov, iovcnt, 0, buf, sizeof(buf)); > +offset = iov_to_buf(iov, iovcnt, 0, buf, NET_BUFSIZE); > } > > if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) { > -return nc->info->receive_raw(nc, buffer, offset); > +ret = nc->info->receive_raw(nc, buffer, offset); > } else { > -return nc->info->receive(nc, buffer, offset); > +ret = nc->info->receive(nc, buffer, offset); > } > + > +g_free(buf); > +return ret; > } > > ssize_t qemu_deliver_packet_iov(NetClientState *sender, > -- > 2.5.0 CCing Jason Wang, net subsystem maintainer. Please use scripts/get_maintainer.pl to find the right people to CC in future patches. We may also want to keep a smaller stack buffer so that reasonably-sized packets (e.g. up to 2 KB) can be send without the performance cost of g_malloc(). signature.asc Description: PGP signature
[Qemu-devel] [PATCH v5] net: Allocating Large sized arrays to heap
nc_sendv_compat has a huge stack usage of 69680 bytes approx. Moving large arrays to heap to reduce stack usage. Reviewed-by: Stefan HajnocziSigned-off-by: Pooja Dhannawat --- net/net.c | 13 + 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/net/net.c b/net/net.c index b0c832e..663da13 100644 --- a/net/net.c +++ b/net/net.c @@ -709,23 +709,28 @@ ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size) static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov, int iovcnt, unsigned flags) { -uint8_t buf[NET_BUFSIZE]; +uint8_t *buf = NULL; uint8_t *buffer; size_t offset; +ssize_t ret; if (iovcnt == 1) { buffer = iov[0].iov_base; offset = iov[0].iov_len; } else { +buf = g_new(uint8_t, NET_BUFSIZE); buffer = buf; -offset = iov_to_buf(iov, iovcnt, 0, buf, sizeof(buf)); +offset = iov_to_buf(iov, iovcnt, 0, buf, NET_BUFSIZE); } if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) { -return nc->info->receive_raw(nc, buffer, offset); +ret = nc->info->receive_raw(nc, buffer, offset); } else { -return nc->info->receive(nc, buffer, offset); +ret = nc->info->receive(nc, buffer, offset); } + +g_free(buf); +return ret; } ssize_t qemu_deliver_packet_iov(NetClientState *sender, -- 2.5.0