Re: [Qemu-devel] [PATCH v5 1/6] fsdev-throttle-qmp: factor out throttle code to reuse code

[xiezhide <xiezhide@huawei.com>]

> -----Original Message-----
> From: Greg Kurz [mailto:groug@kaod.org]
> Sent: Thursday, November 22, 2018 10:46 PM
> To: xiezhide <xiezhide@huawei.com>
> Cc: qemu-devel@nongnu.org; aneesh.kumar@linux.vnet.ibm.com;
> eblake@redhat.com; armbru@redhat.com; berto@igalia.com; zengcanfu
> 00215970 <zengcanfu@huawei.com>; Jinxuefeng <jinxuefeng@huawei.com>;
> Chenhui (Felix, Euler) <chenhui.rtos@huawei.com>
> Subject: Re: [PATCH v5 1/6] fsdev-throttle-qmp: factor out throttle code to
> reuse code
> 
> On Fri, 16 Nov 2018 15:59:16 +0800
> xiezhide <xiezhide@huawei.com> wrote:
> 
> > Factor out throttle parameter parsing code to a new common function
> > which will be used by block and fsdev.
> > Rename function throttle_parse_options to throttle_parse_group to
> > resolve function name conflict
> >
> > Reviewed-by: Eric Blake <eblake@redhat.com>
> > Signed-off-by: xiezhide <xiezhide@huawei.com>
> > ---
> 
> Reviewed-by: Greg Kurz <groug@kaod.org>
> 
> And, since I guess this will likely go through someone else's tree, for the fsdev
> changes:

Yes，Pradeep Jagadeesh<pradeep.jagadeesh@huawei.com> had done some work for this, and I take it over now

> 
> Acked-by: Greg Kurz <groug@kaod.org>
> 
> >  block/throttle.c                |  6 ++--
> >  blockdev.c                      | 43 +-------------------------
> >  fsdev/qemu-fsdev-throttle.c     | 44 ++------------------------
> >  include/qemu/throttle-options.h |  2 ++
> >  include/qemu/throttle.h         |  4 +--
> >  include/qemu/typedefs.h         |  1 +
> >  util/throttle.c                 | 68
> +++++++++++++++++++++++++++++++++++++++++
> >  7 files changed, 79 insertions(+), 89 deletions(-)
> >
> > diff --git a/block/throttle.c b/block/throttle.c index
> > 636c976..bd23c58 100644
> > --- a/block/throttle.c
> > +++ b/block/throttle.c
> > @@ -41,7 +41,7 @@ static QemuOptsList throttle_opts = {
> >   * @group and must be freed by the caller.
> >   * If there's an error then @group remains unmodified.
> >   */
> > -static int throttle_parse_options(QDict *options, char **group, Error
> > **errp)
> > +static int throttle_parse_group(QDict *options, char **group, Error
> > +**errp)
> >  {
> >      int ret;
> >      const char *group_name;
> > @@ -90,7 +90,7 @@ static int throttle_open(BlockDriverState *bs, QDict
> *options,
> >      bs->supported_zero_flags = bs->file->bs->supported_zero_flags |
> >                                 BDRV_REQ_WRITE_UNCHANGED;
> >
> > -    ret = throttle_parse_options(options, &group, errp);
> > +    ret = throttle_parse_group(options, &group, errp);
> >      if (ret == 0) {
> >          /* Register membership to group with name group_name */
> >          throttle_group_register_tgm(tgm, group,
> > bdrv_get_aio_context(bs)); @@ -179,7 +179,7 @@ static int
> throttle_reopen_prepare(BDRVReopenState *reopen_state,
> >      assert(reopen_state != NULL);
> >      assert(reopen_state->bs != NULL);
> >
> > -    ret = throttle_parse_options(reopen_state->options, &group, errp);
> > +    ret = throttle_parse_group(reopen_state->options, &group, errp);
> >      reopen_state->opaque = group;
> >      return ret;
> >  }
> > diff --git a/blockdev.c b/blockdev.c
> > index 81f95d9..fce5d8f 100644
> > --- a/blockdev.c
> > +++ b/blockdev.c
> > @@ -400,48 +400,7 @@ static void
> extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags,
> >      }
> >
> >      if (throttle_cfg) {
> > -        throttle_config_init(throttle_cfg);
> > -        throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg =
> > -            qemu_opt_get_number(opts, "throttling.bps-total", 0);
> > -        throttle_cfg->buckets[THROTTLE_BPS_READ].avg  =
> > -            qemu_opt_get_number(opts, "throttling.bps-read", 0);
> > -        throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg =
> > -            qemu_opt_get_number(opts, "throttling.bps-write", 0);
> > -        throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg =
> > -            qemu_opt_get_number(opts, "throttling.iops-total", 0);
> > -        throttle_cfg->buckets[THROTTLE_OPS_READ].avg =
> > -            qemu_opt_get_number(opts, "throttling.iops-read", 0);
> > -        throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg =
> > -            qemu_opt_get_number(opts, "throttling.iops-write", 0);
> > -
> > -        throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max =
> > -            qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
> > -        throttle_cfg->buckets[THROTTLE_BPS_READ].max  =
> > -            qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
> > -        throttle_cfg->buckets[THROTTLE_BPS_WRITE].max =
> > -            qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
> > -        throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max =
> > -            qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
> > -        throttle_cfg->buckets[THROTTLE_OPS_READ].max =
> > -            qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
> > -        throttle_cfg->buckets[THROTTLE_OPS_WRITE].max =
> > -            qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
> > -
> > -        throttle_cfg->buckets[THROTTLE_BPS_TOTAL].burst_length =
> > -            qemu_opt_get_number(opts,
> "throttling.bps-total-max-length", 1);
> > -        throttle_cfg->buckets[THROTTLE_BPS_READ].burst_length  =
> > -            qemu_opt_get_number(opts,
> "throttling.bps-read-max-length", 1);
> > -        throttle_cfg->buckets[THROTTLE_BPS_WRITE].burst_length =
> > -            qemu_opt_get_number(opts,
> "throttling.bps-write-max-length", 1);
> > -        throttle_cfg->buckets[THROTTLE_OPS_TOTAL].burst_length =
> > -            qemu_opt_get_number(opts,
> "throttling.iops-total-max-length", 1);
> > -        throttle_cfg->buckets[THROTTLE_OPS_READ].burst_length =
> > -            qemu_opt_get_number(opts,
> "throttling.iops-read-max-length", 1);
> > -        throttle_cfg->buckets[THROTTLE_OPS_WRITE].burst_length =
> > -            qemu_opt_get_number(opts,
> "throttling.iops-write-max-length", 1);
> > -
> > -        throttle_cfg->op_size =
> > -            qemu_opt_get_number(opts, "throttling.iops-size", 0);
> > +        throttle_parse_options(throttle_cfg, opts);
> >
> >          if (!throttle_is_valid(throttle_cfg, errp)) {
> >              return;
> > diff --git a/fsdev/qemu-fsdev-throttle.c b/fsdev/qemu-fsdev-throttle.c
> > index cfd8641..6a4108a 100644
> > --- a/fsdev/qemu-fsdev-throttle.c
> > +++ b/fsdev/qemu-fsdev-throttle.c
> > @@ -17,6 +17,7 @@
> >  #include "qemu-fsdev-throttle.h"
> >  #include "qemu/iov.h"
> >  #include "qemu/option.h"
> > +#include "qemu/throttle-options.h"
> >
> >  static void fsdev_throttle_read_timer_cb(void *opaque)  { @@ -32,48
> > +33,7 @@ static void fsdev_throttle_write_timer_cb(void *opaque)
> >
> >  void fsdev_throttle_parse_opts(QemuOpts *opts, FsThrottle *fst, Error
> > **errp)  {
> > -    throttle_config_init(&fst->cfg);
> > -    fst->cfg.buckets[THROTTLE_BPS_TOTAL].avg =
> > -        qemu_opt_get_number(opts, "throttling.bps-total", 0);
> > -    fst->cfg.buckets[THROTTLE_BPS_READ].avg  =
> > -        qemu_opt_get_number(opts, "throttling.bps-read", 0);
> > -    fst->cfg.buckets[THROTTLE_BPS_WRITE].avg =
> > -        qemu_opt_get_number(opts, "throttling.bps-write", 0);
> > -    fst->cfg.buckets[THROTTLE_OPS_TOTAL].avg =
> > -        qemu_opt_get_number(opts, "throttling.iops-total", 0);
> > -    fst->cfg.buckets[THROTTLE_OPS_READ].avg =
> > -        qemu_opt_get_number(opts, "throttling.iops-read", 0);
> > -    fst->cfg.buckets[THROTTLE_OPS_WRITE].avg =
> > -        qemu_opt_get_number(opts, "throttling.iops-write", 0);
> > -
> > -    fst->cfg.buckets[THROTTLE_BPS_TOTAL].max =
> > -        qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
> > -    fst->cfg.buckets[THROTTLE_BPS_READ].max  =
> > -        qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
> > -    fst->cfg.buckets[THROTTLE_BPS_WRITE].max =
> > -        qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
> > -    fst->cfg.buckets[THROTTLE_OPS_TOTAL].max =
> > -        qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
> > -    fst->cfg.buckets[THROTTLE_OPS_READ].max =
> > -        qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
> > -    fst->cfg.buckets[THROTTLE_OPS_WRITE].max =
> > -        qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
> > -
> > -    fst->cfg.buckets[THROTTLE_BPS_TOTAL].burst_length =
> > -        qemu_opt_get_number(opts, "throttling.bps-total-max-length",
> 1);
> > -    fst->cfg.buckets[THROTTLE_BPS_READ].burst_length  =
> > -        qemu_opt_get_number(opts, "throttling.bps-read-max-length",
> 1);
> > -    fst->cfg.buckets[THROTTLE_BPS_WRITE].burst_length =
> > -        qemu_opt_get_number(opts, "throttling.bps-write-max-length",
> 1);
> > -    fst->cfg.buckets[THROTTLE_OPS_TOTAL].burst_length =
> > -        qemu_opt_get_number(opts, "throttling.iops-total-max-length",
> 1);
> > -    fst->cfg.buckets[THROTTLE_OPS_READ].burst_length =
> > -        qemu_opt_get_number(opts, "throttling.iops-read-max-length",
> 1);
> > -    fst->cfg.buckets[THROTTLE_OPS_WRITE].burst_length =
> > -        qemu_opt_get_number(opts, "throttling.iops-write-max-length",
> 1);
> > -    fst->cfg.op_size =
> > -        qemu_opt_get_number(opts, "throttling.iops-size", 0);
> > -
> > +    throttle_parse_options(&fst->cfg, opts);
> >      throttle_is_valid(&fst->cfg, errp);  }
> >
> > diff --git a/include/qemu/throttle-options.h
> > b/include/qemu/throttle-options.h index 3528a8f..944a08c 100644
> > --- a/include/qemu/throttle-options.h
> > +++ b/include/qemu/throttle-options.h
> > @@ -111,4 +111,6 @@
> >              .help = "when limiting by iops max size of an I/O in bytes",\
> >          }
> >
> > +void throttle_parse_options(ThrottleConfig *, QemuOpts *);
> > +
> >  #endif
> > diff --git a/include/qemu/throttle.h b/include/qemu/throttle.h index
> > abeb886..f379d91 100644
> > --- a/include/qemu/throttle.h
> > +++ b/include/qemu/throttle.h
> > @@ -90,10 +90,10 @@ typedef struct LeakyBucket {
> >   * However it allows to keep the code clean and the bucket field is reset to
> >   * zero at the right time.
> >   */
> > -typedef struct ThrottleConfig {
> > +struct ThrottleConfig {
> >      LeakyBucket buckets[BUCKETS_COUNT]; /* leaky buckets */
> >      uint64_t op_size;         /* size of an operation in bytes */
> > -} ThrottleConfig;
> > +};
> >
> >  typedef struct ThrottleState {
> >      ThrottleConfig cfg;       /* configuration */
> > diff --git a/include/qemu/typedefs.h b/include/qemu/typedefs.h index
> > 3ec0e13..0d75edc 100644
> > --- a/include/qemu/typedefs.h
> > +++ b/include/qemu/typedefs.h
> > @@ -109,6 +109,7 @@ typedef struct SerialState SerialState;  typedef
> > struct SHPCDevice SHPCDevice;  typedef struct SMBusDevice SMBusDevice;
> > typedef struct SSIBus SSIBus;
> > +typedef struct ThrottleConfig ThrottleConfig;
> >  typedef struct uWireSlave uWireSlave;  typedef struct VirtIODevice
> > VirtIODevice;  typedef struct Visitor Visitor; diff --git
> > a/util/throttle.c b/util/throttle.c index b38e742..e7db2ad 100644
> > --- a/util/throttle.c
> > +++ b/util/throttle.c
> > @@ -27,6 +27,8 @@
> >  #include "qemu/throttle.h"
> >  #include "qemu/timer.h"
> >  #include "block/aio.h"
> > +#include "qemu/option.h"
> > +#include "qemu/throttle-options.h"
> >
> >  /* This function make a bucket leak
> >   *
> > @@ -636,3 +638,69 @@ void throttle_config_to_limits(ThrottleConfig *cfg,
> ThrottleLimits *var)
> >      var->has_iops_write_max_length = true;
> >      var->has_iops_size = true;
> >  }
> > +
> > +/* parse the throttle options
> > + *
> > + * @opts: qemu options
> > + * @throttle_cfg: throttle configuration  */ void
> > +throttle_parse_options(ThrottleConfig *throttle_cfg, QemuOpts *opts)
> > +{
> > +    throttle_config_init(throttle_cfg);
> > +    throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg =
> > +        qemu_opt_get_number(opts, THROTTLE_OPT_PREFIX
> > +                            QEMU_OPT_BPS_TOTAL, 0);
> > +    throttle_cfg->buckets[THROTTLE_BPS_READ].avg  =
> > +        qemu_opt_get_number(opts, THROTTLE_OPT_PREFIX
> > +                            QEMU_OPT_BPS_READ, 0);
> > +    throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg =
> > +        qemu_opt_get_number(opts, THROTTLE_OPT_PREFIX
> > +                            QEMU_OPT_BPS_WRITE, 0);
> > +    throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg =
> > +        qemu_opt_get_number(opts, THROTTLE_OPT_PREFIX
> > +                            QEMU_OPT_IOPS_TOTAL, 0);
> > +    throttle_cfg->buckets[THROTTLE_OPS_READ].avg =
> > +        qemu_opt_get_number(opts, THROTTLE_OPT_PREFIX
> > +                            QEMU_OPT_IOPS_READ, 0);
> > +    throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg =
> > +        qemu_opt_get_number(opts, THROTTLE_OPT_PREFIX
> > +                            QEMU_OPT_IOPS_WRITE, 0);
> > +    throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max =
> > +        qemu_opt_get_number(opts, THROTTLE_OPT_PREFIX
> > +                            QEMU_OPT_BPS_TOTAL_MAX, 0);
> > +    throttle_cfg->buckets[THROTTLE_BPS_READ].max  =
> > +        qemu_opt_get_number(opts, THROTTLE_OPT_PREFIX
> > +                            QEMU_OPT_BPS_READ_MAX, 0);
> > +    throttle_cfg->buckets[THROTTLE_BPS_WRITE].max =
> > +        qemu_opt_get_number(opts, THROTTLE_OPT_PREFIX
> > +                            QEMU_OPT_BPS_WRITE_MAX, 0);
> > +    throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max =
> > +        qemu_opt_get_number(opts, THROTTLE_OPT_PREFIX
> > +                            QEMU_OPT_IOPS_TOTAL_MAX, 0);
> > +    throttle_cfg->buckets[THROTTLE_OPS_READ].max =
> > +        qemu_opt_get_number(opts, THROTTLE_OPT_PREFIX
> > +                            QEMU_OPT_IOPS_READ_MAX, 0);
> > +    throttle_cfg->buckets[THROTTLE_OPS_WRITE].max =
> > +        qemu_opt_get_number(opts, THROTTLE_OPT_PREFIX
> > +                            QEMU_OPT_IOPS_WRITE_MAX, 0);
> > +    throttle_cfg->buckets[THROTTLE_BPS_TOTAL].burst_length =
> > +        qemu_opt_get_number(opts, THROTTLE_OPT_PREFIX
> > +                            QEMU_OPT_BPS_TOTAL_MAX_LENGTH,
> 1);
> > +    throttle_cfg->buckets[THROTTLE_BPS_READ].burst_length  =
> > +        qemu_opt_get_number(opts, THROTTLE_OPT_PREFIX
> > +                            QEMU_OPT_BPS_READ_MAX_LENGTH,
> 1);
> > +    throttle_cfg->buckets[THROTTLE_BPS_WRITE].burst_length =
> > +        qemu_opt_get_number(opts, THROTTLE_OPT_PREFIX
> > +                            QEMU_OPT_BPS_WRITE_MAX_LENGTH,
> 1);
> > +    throttle_cfg->buckets[THROTTLE_OPS_TOTAL].burst_length =
> > +        qemu_opt_get_number(opts, THROTTLE_OPT_PREFIX
> > +                            QEMU_OPT_IOPS_TOTAL_MAX_LENGTH,
> 1);
> > +    throttle_cfg->buckets[THROTTLE_OPS_READ].burst_length =
> > +        qemu_opt_get_number(opts, THROTTLE_OPT_PREFIX
> > +                            QEMU_OPT_IOPS_READ_MAX_LENGTH,
> 1);
> > +    throttle_cfg->buckets[THROTTLE_OPS_WRITE].burst_length =
> > +        qemu_opt_get_number(opts, THROTTLE_OPT_PREFIX
> > +                            QEMU_OPT_IOPS_WRITE_MAX_LENGTH,
> 1);
> > +    throttle_cfg->op_size =
> > +        qemu_opt_get_number(opts, THROTTLE_OPT_PREFIX
> > +QEMU_OPT_IOPS_SIZE, 0); }