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author | 2017-03-14 08:26:04 -0700 | |
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committer | 2017-03-14 08:26:04 -0700 | |
commit | a6bec8fc3159b54fc447a029b6260b3d6c478e6b (patch) | |
tree | a63e620e47aad870c4cb9cdb2c03dd529dc43768 /src/core/lib/surface/channel.c | |
parent | 7d2c39827688026ca54b6a8a4d36c36d79aa282a (diff) |
Auto-call-arena-sizing
Diffstat (limited to 'src/core/lib/surface/channel.c')
-rw-r--r-- | src/core/lib/surface/channel.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/src/core/lib/surface/channel.c b/src/core/lib/surface/channel.c index d6acd392c1..56beb7d96e 100644 --- a/src/core/lib/surface/channel.c +++ b/src/core/lib/surface/channel.c @@ -68,6 +68,8 @@ struct grpc_channel { grpc_compression_options compression_options; grpc_mdelem default_authority; + gpr_atm call_size_estimate; + gpr_mu registered_call_mu; registered_call *registered_calls; @@ -115,6 +117,10 @@ grpc_channel *grpc_channel_create(grpc_exec_ctx *exec_ctx, const char *target, gpr_mu_init(&channel->registered_call_mu); channel->registered_calls = NULL; + gpr_atm_no_barrier_store( + &channel->call_size_estimate, + CHANNEL_STACK_FROM_CHANNEL(channel)->call_stack_size); + grpc_compression_options_init(&channel->compression_options); for (size_t i = 0; i < args->num_args; i++) { if (0 == strcmp(args->args[i].key, GRPC_ARG_DEFAULT_AUTHORITY)) { @@ -177,6 +183,32 @@ done: return channel; } +size_t grpc_channel_get_call_size_estimate(grpc_channel *channel) { +#define ROUND_UP_SIZE 256 + return ((size_t)gpr_atm_no_barrier_load(&channel->call_size_estimate) + + ROUND_UP_SIZE) & + ~(size_t)(ROUND_UP_SIZE - 1); +} + +void grpc_channel_update_call_size_estimate(grpc_channel *channel, + size_t size) { + size_t cur = (size_t)gpr_atm_no_barrier_load(&channel->call_size_estimate); + if (cur < size) { + /* size grew: update estimate */ + gpr_atm_no_barrier_cas(&channel->call_size_estimate, (gpr_atm)cur, + (gpr_atm)size); + /* if we lose: never mind, something else will likely update soon enough */ + } else if (cur == size) { + /* no change: holding pattern */ + } else if (cur > 0) { + /* size shrank: decrease estimate */ + gpr_atm_no_barrier_cas( + &channel->call_size_estimate, (gpr_atm)cur, + (gpr_atm)(GPR_MIN(cur - 1, (255 * cur + size) / 256))); + /* if we lose: never mind, something else will likely update soon enough */ + } +} + char *grpc_channel_get_target(grpc_channel *channel) { GRPC_API_TRACE("grpc_channel_get_target(channel=%p)", 1, (channel)); return gpr_strdup(channel->target); |